Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * sh.c -- a prototype Bourne shell grammar parser |
| 4 | * Intended to follow the original Thompson and Ritchie |
| 5 | * "small and simple is beautiful" philosophy, which |
| 6 | * incidentally is a good match to today's BusyBox. |
| 7 | * |
| 8 | * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org> |
| 9 | * |
| 10 | * Credits: |
| 11 | * The parser routines proper are all original material, first |
Eric Andersen | cb81e64 | 2003-07-14 21:21:08 +0000 | [diff] [blame] | 12 | * written Dec 2000 and Jan 2001 by Larry Doolittle. The |
| 13 | * execution engine, the builtins, and much of the underlying |
| 14 | * support has been adapted from busybox-0.49pre's lash, which is |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 15 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
Eric Andersen | cb81e64 | 2003-07-14 21:21:08 +0000 | [diff] [blame] | 16 | * written by Erik Andersen <andersen@codepoet.org>. That, in turn, |
| 17 | * is based in part on ladsh.c, by Michael K. Johnson and Erik W. |
| 18 | * Troan, which they placed in the public domain. I don't know |
| 19 | * how much of the Johnson/Troan code has survived the repeated |
| 20 | * rewrites. |
| 21 | * |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 22 | * Other credits: |
| 23 | * simple_itoa() was lifted from boa-0.93.15 |
| 24 | * b_addchr() derived from similar w_addchar function in glibc-2.2 |
| 25 | * setup_redirect(), redirect_opt_num(), and big chunks of main() |
| 26 | * and many builtins derived from contributions by Erik Andersen |
| 27 | * miscellaneous bugfixes from Matt Kraai |
| 28 | * |
| 29 | * There are two big (and related) architecture differences between |
| 30 | * this parser and the lash parser. One is that this version is |
| 31 | * actually designed from the ground up to understand nearly all |
| 32 | * of the Bourne grammar. The second, consequential change is that |
| 33 | * the parser and input reader have been turned inside out. Now, |
| 34 | * the parser is in control, and asks for input as needed. The old |
| 35 | * way had the input reader in control, and it asked for parsing to |
| 36 | * take place as needed. The new way makes it much easier to properly |
| 37 | * handle the recursion implicit in the various substitutions, especially |
| 38 | * across continuation lines. |
| 39 | * |
| 40 | * Bash grammar not implemented: (how many of these were in original sh?) |
| 41 | * $@ (those sure look like weird quoting rules) |
| 42 | * $_ |
| 43 | * ! negation operator for pipes |
| 44 | * &> and >& redirection of stdout+stderr |
| 45 | * Brace Expansion |
| 46 | * Tilde Expansion |
| 47 | * fancy forms of Parameter Expansion |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 48 | * aliases |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 49 | * Arithmetic Expansion |
| 50 | * <(list) and >(list) Process Substitution |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 51 | * reserved words: case, esac, select, function |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 52 | * Here Documents ( << word ) |
| 53 | * Functions |
| 54 | * Major bugs: |
| 55 | * job handling woefully incomplete and buggy |
| 56 | * reserved word execution woefully incomplete and buggy |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 57 | * to-do: |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 58 | * port selected bugfixes from post-0.49 busybox lash - done? |
| 59 | * finish implementing reserved words: for, while, until, do, done |
| 60 | * change { and } from special chars to reserved words |
| 61 | * builtins: break, continue, eval, return, set, trap, ulimit |
| 62 | * test magic exec |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 63 | * handle children going into background |
| 64 | * clean up recognition of null pipes |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 65 | * check setting of global_argc and global_argv |
| 66 | * control-C handling, probably with longjmp |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 67 | * follow IFS rules more precisely, including update semantics |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 68 | * figure out what to do with backslash-newline |
| 69 | * explain why we use signal instead of sigaction |
| 70 | * propagate syntax errors, die on resource errors? |
| 71 | * continuation lines, both explicit and implicit - done? |
| 72 | * memory leak finding and plugging - done? |
| 73 | * more testing, especially quoting rules and redirection |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 74 | * document how quoting rules not precisely followed for variable assignments |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 75 | * maybe change map[] to use 2-bit entries |
| 76 | * (eventually) remove all the printf's |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 77 | * |
| 78 | * This program is free software; you can redistribute it and/or modify |
| 79 | * it under the terms of the GNU General Public License as published by |
| 80 | * the Free Software Foundation; either version 2 of the License, or |
| 81 | * (at your option) any later version. |
| 82 | * |
| 83 | * This program is distributed in the hope that it will be useful, |
| 84 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 85 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 86 | * General Public License for more details. |
| 87 | * |
| 88 | * You should have received a copy of the GNU General Public License |
| 89 | * along with this program; if not, write to the Free Software |
| 90 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 91 | */ |
| 92 | #include <ctype.h> /* isalpha, isdigit */ |
| 93 | #include <unistd.h> /* getpid */ |
| 94 | #include <stdlib.h> /* getenv, atoi */ |
| 95 | #include <string.h> /* strchr */ |
| 96 | #include <stdio.h> /* popen etc. */ |
| 97 | #include <glob.h> /* glob, of course */ |
| 98 | #include <stdarg.h> /* va_list */ |
| 99 | #include <errno.h> |
| 100 | #include <fcntl.h> |
| 101 | #include <getopt.h> /* should be pretty obvious */ |
| 102 | |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 103 | #include <sys/stat.h> /* ulimit */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 104 | #include <sys/types.h> |
| 105 | #include <sys/wait.h> |
| 106 | #include <signal.h> |
| 107 | |
| 108 | /* #include <dmalloc.h> */ |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 109 | /* #define DEBUG_SHELL */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 110 | |
Eric Andersen | da15a49 | 2002-12-06 21:37:08 +0000 | [diff] [blame] | 111 | #if 1 |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 112 | #include "busybox.h" |
| 113 | #include "cmdedit.h" |
| 114 | #else |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 115 | #define bb_applet_name "hush" |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 116 | #include "standalone.h" |
Matt Kraai | 2d91deb | 2001-08-01 17:21:35 +0000 | [diff] [blame] | 117 | #define hush_main main |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 118 | #undef CONFIG_FEATURE_SH_FANCY_PROMPT |
| 119 | #define BB_BANNER |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 120 | #endif |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 121 | #define SPECIAL_VAR_SYMBOL 03 |
| 122 | #define FLAG_EXIT_FROM_LOOP 1 |
| 123 | #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ |
| 124 | #define FLAG_REPARSING (1 << 2) /* >=2nd pass */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 125 | |
| 126 | typedef enum { |
| 127 | REDIRECT_INPUT = 1, |
| 128 | REDIRECT_OVERWRITE = 2, |
| 129 | REDIRECT_APPEND = 3, |
| 130 | REDIRECT_HEREIS = 4, |
| 131 | REDIRECT_IO = 5 |
| 132 | } redir_type; |
| 133 | |
| 134 | /* The descrip member of this structure is only used to make debugging |
| 135 | * output pretty */ |
"Vladimir N. Oleynik" | 485d7cb | 2005-10-17 09:48:57 +0000 | [diff] [blame] | 136 | static const struct {int mode; int default_fd; const char *descrip;} redir_table[] = { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 137 | { 0, 0, "()" }, |
| 138 | { O_RDONLY, 0, "<" }, |
| 139 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, |
| 140 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, |
| 141 | { O_RDONLY, -1, "<<" }, |
| 142 | { O_RDWR, 1, "<>" } |
| 143 | }; |
| 144 | |
| 145 | typedef enum { |
| 146 | PIPE_SEQ = 1, |
| 147 | PIPE_AND = 2, |
| 148 | PIPE_OR = 3, |
| 149 | PIPE_BG = 4, |
| 150 | } pipe_style; |
| 151 | |
| 152 | /* might eventually control execution */ |
| 153 | typedef enum { |
| 154 | RES_NONE = 0, |
| 155 | RES_IF = 1, |
| 156 | RES_THEN = 2, |
| 157 | RES_ELIF = 3, |
| 158 | RES_ELSE = 4, |
| 159 | RES_FI = 5, |
| 160 | RES_FOR = 6, |
| 161 | RES_WHILE = 7, |
| 162 | RES_UNTIL = 8, |
| 163 | RES_DO = 9, |
| 164 | RES_DONE = 10, |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 165 | RES_XXXX = 11, |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 166 | RES_IN = 12, |
| 167 | RES_SNTX = 13 |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 168 | } reserved_style; |
| 169 | #define FLAG_END (1<<RES_NONE) |
| 170 | #define FLAG_IF (1<<RES_IF) |
| 171 | #define FLAG_THEN (1<<RES_THEN) |
| 172 | #define FLAG_ELIF (1<<RES_ELIF) |
| 173 | #define FLAG_ELSE (1<<RES_ELSE) |
| 174 | #define FLAG_FI (1<<RES_FI) |
| 175 | #define FLAG_FOR (1<<RES_FOR) |
| 176 | #define FLAG_WHILE (1<<RES_WHILE) |
| 177 | #define FLAG_UNTIL (1<<RES_UNTIL) |
| 178 | #define FLAG_DO (1<<RES_DO) |
| 179 | #define FLAG_DONE (1<<RES_DONE) |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 180 | #define FLAG_IN (1<<RES_IN) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 181 | #define FLAG_START (1<<RES_XXXX) |
| 182 | |
| 183 | /* This holds pointers to the various results of parsing */ |
| 184 | struct p_context { |
| 185 | struct child_prog *child; |
| 186 | struct pipe *list_head; |
| 187 | struct pipe *pipe; |
| 188 | struct redir_struct *pending_redirect; |
| 189 | reserved_style w; |
| 190 | int old_flag; /* for figuring out valid reserved words */ |
| 191 | struct p_context *stack; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 192 | int type; /* define type of parser : ";$" common or special symbol */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 193 | /* How about quoting status? */ |
| 194 | }; |
| 195 | |
| 196 | struct redir_struct { |
| 197 | redir_type type; /* type of redirection */ |
| 198 | int fd; /* file descriptor being redirected */ |
| 199 | int dup; /* -1, or file descriptor being duplicated */ |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 200 | struct redir_struct *next; /* pointer to the next redirect in the list */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 201 | glob_t word; /* *word.gl_pathv is the filename */ |
| 202 | }; |
| 203 | |
| 204 | struct child_prog { |
| 205 | pid_t pid; /* 0 if exited */ |
| 206 | char **argv; /* program name and arguments */ |
| 207 | struct pipe *group; /* if non-NULL, first in group or subshell */ |
| 208 | int subshell; /* flag, non-zero if group must be forked */ |
| 209 | struct redir_struct *redirects; /* I/O redirections */ |
| 210 | glob_t glob_result; /* result of parameter globbing */ |
| 211 | int is_stopped; /* is the program currently running? */ |
| 212 | struct pipe *family; /* pointer back to the child's parent pipe */ |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 213 | int sp; /* number of SPECIAL_VAR_SYMBOL */ |
| 214 | int type; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 215 | }; |
| 216 | |
| 217 | struct pipe { |
| 218 | int jobid; /* job number */ |
| 219 | int num_progs; /* total number of programs in job */ |
| 220 | int running_progs; /* number of programs running */ |
| 221 | char *text; /* name of job */ |
| 222 | char *cmdbuf; /* buffer various argv's point into */ |
| 223 | pid_t pgrp; /* process group ID for the job */ |
| 224 | struct child_prog *progs; /* array of commands in pipe */ |
| 225 | struct pipe *next; /* to track background commands */ |
| 226 | int stopped_progs; /* number of programs alive, but stopped */ |
| 227 | int job_context; /* bitmask defining current context */ |
| 228 | pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ |
| 229 | reserved_style r_mode; /* supports if, for, while, until */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 230 | }; |
| 231 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 232 | struct close_me { |
| 233 | int fd; |
| 234 | struct close_me *next; |
| 235 | }; |
| 236 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 237 | struct variables { |
| 238 | char *name; |
| 239 | char *value; |
| 240 | int flg_export; |
| 241 | int flg_read_only; |
| 242 | struct variables *next; |
| 243 | }; |
| 244 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 245 | /* globals, connect us to the outside world |
| 246 | * the first three support $?, $#, and $1 */ |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 247 | static char **global_argv; |
| 248 | static unsigned int global_argc; |
| 249 | static unsigned int last_return_code; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 250 | extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 251 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 252 | /* "globals" within this file */ |
Eric Andersen | bc604a2 | 2001-05-16 05:24:03 +0000 | [diff] [blame] | 253 | static char *ifs; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 254 | static char map[256]; |
Eric Andersen | bc604a2 | 2001-05-16 05:24:03 +0000 | [diff] [blame] | 255 | static int fake_mode; |
| 256 | static int interactive; |
| 257 | static struct close_me *close_me_head; |
Eric Andersen | cfa88ec | 2001-05-11 18:08:16 +0000 | [diff] [blame] | 258 | static const char *cwd; |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 259 | static struct pipe *job_list; |
Eric Andersen | bc604a2 | 2001-05-16 05:24:03 +0000 | [diff] [blame] | 260 | static unsigned int last_bg_pid; |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 261 | static unsigned int last_jobid; |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 262 | static unsigned int shell_terminal; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 263 | static char *PS1; |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 264 | static char *PS2; |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 265 | static struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; |
| 266 | static struct variables *top_vars = &shell_ver; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 267 | |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 268 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 269 | #define B_CHUNK (100) |
| 270 | #define B_NOSPAC 1 |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 271 | |
| 272 | typedef struct { |
| 273 | char *data; |
| 274 | int length; |
| 275 | int maxlen; |
| 276 | int quote; |
| 277 | int nonnull; |
| 278 | } o_string; |
| 279 | #define NULL_O_STRING {NULL,0,0,0,0} |
| 280 | /* used for initialization: |
| 281 | o_string foo = NULL_O_STRING; */ |
| 282 | |
| 283 | /* I can almost use ordinary FILE *. Is open_memstream() universally |
| 284 | * available? Where is it documented? */ |
| 285 | struct in_str { |
| 286 | const char *p; |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 287 | char peek_buf[2]; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 288 | int __promptme; |
| 289 | int promptmode; |
| 290 | FILE *file; |
| 291 | int (*get) (struct in_str *); |
| 292 | int (*peek) (struct in_str *); |
| 293 | }; |
| 294 | #define b_getch(input) ((input)->get(input)) |
| 295 | #define b_peek(input) ((input)->peek(input)) |
| 296 | |
| 297 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" |
| 298 | |
| 299 | struct built_in_command { |
"Vladimir N. Oleynik" | 485d7cb | 2005-10-17 09:48:57 +0000 | [diff] [blame] | 300 | const char *cmd; /* name */ |
| 301 | const char *descr; /* description */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 302 | int (*function) (struct child_prog *); /* function ptr */ |
| 303 | }; |
| 304 | |
| 305 | /* belongs in busybox.h */ |
| 306 | static inline int max(int a, int b) { |
| 307 | return (a>b)?a:b; |
| 308 | } |
| 309 | |
| 310 | /* This should be in utility.c */ |
| 311 | #ifdef DEBUG_SHELL |
| 312 | static void debug_printf(const char *format, ...) |
| 313 | { |
| 314 | va_list args; |
| 315 | va_start(args, format); |
| 316 | vfprintf(stderr, format, args); |
| 317 | va_end(args); |
| 318 | } |
| 319 | #else |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 320 | static inline void debug_printf(const char *format, ...) { } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 321 | #endif |
| 322 | #define final_printf debug_printf |
| 323 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 324 | static void __syntax(char *file, int line) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 325 | bb_error_msg("syntax error %s:%d", file, line); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 326 | } |
| 327 | #define syntax() __syntax(__FILE__, __LINE__) |
| 328 | |
| 329 | /* Index of subroutines: */ |
| 330 | /* function prototypes for builtins */ |
| 331 | static int builtin_cd(struct child_prog *child); |
| 332 | static int builtin_env(struct child_prog *child); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 333 | static int builtin_eval(struct child_prog *child); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 334 | static int builtin_exec(struct child_prog *child); |
| 335 | static int builtin_exit(struct child_prog *child); |
| 336 | static int builtin_export(struct child_prog *child); |
| 337 | static int builtin_fg_bg(struct child_prog *child); |
| 338 | static int builtin_help(struct child_prog *child); |
| 339 | static int builtin_jobs(struct child_prog *child); |
| 340 | static int builtin_pwd(struct child_prog *child); |
| 341 | static int builtin_read(struct child_prog *child); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 342 | static int builtin_set(struct child_prog *child); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 343 | static int builtin_shift(struct child_prog *child); |
| 344 | static int builtin_source(struct child_prog *child); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 345 | static int builtin_umask(struct child_prog *child); |
| 346 | static int builtin_unset(struct child_prog *child); |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 347 | static int builtin_not_written(struct child_prog *child); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 348 | /* o_string manipulation: */ |
| 349 | static int b_check_space(o_string *o, int len); |
| 350 | static int b_addchr(o_string *o, int ch); |
| 351 | static void b_reset(o_string *o); |
| 352 | static int b_addqchr(o_string *o, int ch, int quote); |
| 353 | static int b_adduint(o_string *o, unsigned int i); |
| 354 | /* in_str manipulations: */ |
| 355 | static int static_get(struct in_str *i); |
| 356 | static int static_peek(struct in_str *i); |
| 357 | static int file_get(struct in_str *i); |
| 358 | static int file_peek(struct in_str *i); |
| 359 | static void setup_file_in_str(struct in_str *i, FILE *f); |
| 360 | static void setup_string_in_str(struct in_str *i, const char *s); |
| 361 | /* close_me manipulations: */ |
| 362 | static void mark_open(int fd); |
| 363 | static void mark_closed(int fd); |
Eric Andersen | eaecbf3 | 2001-10-31 10:41:31 +0000 | [diff] [blame] | 364 | static void close_all(void); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 365 | /* "run" the final data structures: */ |
| 366 | static char *indenter(int i); |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 367 | static int free_pipe_list(struct pipe *head, int indent); |
| 368 | static int free_pipe(struct pipe *pi, int indent); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 369 | /* really run the final data structures: */ |
| 370 | static int setup_redirects(struct child_prog *prog, int squirrel[]); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 371 | static int run_list_real(struct pipe *pi); |
| 372 | static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); |
| 373 | static int run_pipe_real(struct pipe *pi); |
| 374 | /* extended glob support: */ |
| 375 | static int globhack(const char *src, int flags, glob_t *pglob); |
| 376 | static int glob_needed(const char *s); |
| 377 | static int xglob(o_string *dest, int flags, glob_t *pglob); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 378 | /* variable assignment: */ |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 379 | static int is_assignment(const char *s); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 380 | /* data structure manipulation: */ |
| 381 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); |
| 382 | static void initialize_context(struct p_context *ctx); |
| 383 | static int done_word(o_string *dest, struct p_context *ctx); |
| 384 | static int done_command(struct p_context *ctx); |
| 385 | static int done_pipe(struct p_context *ctx, pipe_style type); |
| 386 | /* primary string parsing: */ |
| 387 | static int redirect_dup_num(struct in_str *input); |
| 388 | static int redirect_opt_num(o_string *o); |
| 389 | static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); |
| 390 | static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 391 | static char *lookup_param(char *src); |
| 392 | static char *make_string(char **inp); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 393 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); |
| 394 | static int parse_string(o_string *dest, struct p_context *ctx, const char *src); |
| 395 | static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); |
| 396 | /* setup: */ |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 397 | static int parse_stream_outer(struct in_str *inp, int flag); |
| 398 | static int parse_string_outer(const char *s, int flag); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 399 | static int parse_file_outer(FILE *f); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 400 | /* job management: */ |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 401 | static int checkjobs(struct pipe* fg_pipe); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 402 | static void insert_bg_job(struct pipe *pi); |
| 403 | static void remove_bg_job(struct pipe *pi); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 404 | /* local variable support */ |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 405 | static char **make_list_in(char **inp, char *name); |
| 406 | static char *insert_var_value(char *inp); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 407 | static char *get_local_var(const char *var); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 408 | static void unset_local_var(const char *name); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 409 | static int set_local_var(const char *s, int flg_export); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 410 | |
| 411 | /* Table of built-in functions. They can be forked or not, depending on |
| 412 | * context: within pipes, they fork. As simple commands, they do not. |
| 413 | * When used in non-forking context, they can change global variables |
| 414 | * in the parent shell process. If forked, of course they can not. |
| 415 | * For example, 'unset foo | whatever' will parse and run, but foo will |
| 416 | * still be set at the end. */ |
"Vladimir N. Oleynik" | 485d7cb | 2005-10-17 09:48:57 +0000 | [diff] [blame] | 417 | static const struct built_in_command bltins[] = { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 418 | {"bg", "Resume a job in the background", builtin_fg_bg}, |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 419 | {"break", "Exit for, while or until loop", builtin_not_written}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 420 | {"cd", "Change working directory", builtin_cd}, |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 421 | {"continue", "Continue for, while or until loop", builtin_not_written}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 422 | {"env", "Print all environment variables", builtin_env}, |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 423 | {"eval", "Construct and run shell command", builtin_eval}, |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 424 | {"exec", "Exec command, replacing this shell with the exec'd process", |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 425 | builtin_exec}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 426 | {"exit", "Exit from shell()", builtin_exit}, |
| 427 | {"export", "Set environment variable", builtin_export}, |
| 428 | {"fg", "Bring job into the foreground", builtin_fg_bg}, |
| 429 | {"jobs", "Lists the active jobs", builtin_jobs}, |
| 430 | {"pwd", "Print current directory", builtin_pwd}, |
| 431 | {"read", "Input environment variable", builtin_read}, |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 432 | {"return", "Return from a function", builtin_not_written}, |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 433 | {"set", "Set/unset shell local variables", builtin_set}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 434 | {"shift", "Shift positional parameters", builtin_shift}, |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 435 | {"trap", "Trap signals", builtin_not_written}, |
| 436 | {"ulimit","Controls resource limits", builtin_not_written}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 437 | {"umask","Sets file creation mask", builtin_umask}, |
| 438 | {"unset", "Unset environment variable", builtin_unset}, |
| 439 | {".", "Source-in and run commands in a file", builtin_source}, |
| 440 | {"help", "List shell built-in commands", builtin_help}, |
| 441 | {NULL, NULL, NULL} |
| 442 | }; |
| 443 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 444 | static const char *set_cwd(void) |
| 445 | { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 446 | if(cwd==bb_msg_unknown) |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 447 | cwd = NULL; /* xgetcwd(arg) called free(arg) */ |
| 448 | cwd = xgetcwd((char *)cwd); |
| 449 | if (!cwd) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 450 | cwd = bb_msg_unknown; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 451 | return cwd; |
| 452 | } |
| 453 | |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 454 | /* built-in 'eval' handler */ |
| 455 | static int builtin_eval(struct child_prog *child) |
| 456 | { |
| 457 | char *str = NULL; |
| 458 | int rcode = EXIT_SUCCESS; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 459 | |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 460 | if (child->argv[1]) { |
| 461 | str = make_string(child->argv + 1); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 462 | parse_string_outer(str, FLAG_EXIT_FROM_LOOP | |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 463 | FLAG_PARSE_SEMICOLON); |
| 464 | free(str); |
| 465 | rcode = last_return_code; |
| 466 | } |
| 467 | return rcode; |
| 468 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 469 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 470 | /* built-in 'cd <path>' handler */ |
| 471 | static int builtin_cd(struct child_prog *child) |
| 472 | { |
| 473 | char *newdir; |
| 474 | if (child->argv[1] == NULL) |
| 475 | newdir = getenv("HOME"); |
| 476 | else |
| 477 | newdir = child->argv[1]; |
| 478 | if (chdir(newdir)) { |
| 479 | printf("cd: %s: %s\n", newdir, strerror(errno)); |
| 480 | return EXIT_FAILURE; |
| 481 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 482 | set_cwd(); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 483 | return EXIT_SUCCESS; |
| 484 | } |
| 485 | |
| 486 | /* built-in 'env' handler */ |
| 487 | static int builtin_env(struct child_prog *dummy) |
| 488 | { |
| 489 | char **e = environ; |
| 490 | if (e == NULL) return EXIT_FAILURE; |
| 491 | for (; *e; e++) { |
| 492 | puts(*e); |
| 493 | } |
| 494 | return EXIT_SUCCESS; |
| 495 | } |
| 496 | |
| 497 | /* built-in 'exec' handler */ |
| 498 | static int builtin_exec(struct child_prog *child) |
| 499 | { |
| 500 | if (child->argv[1] == NULL) |
| 501 | return EXIT_SUCCESS; /* Really? */ |
| 502 | child->argv++; |
| 503 | pseudo_exec(child); |
| 504 | /* never returns */ |
| 505 | } |
| 506 | |
| 507 | /* built-in 'exit' handler */ |
| 508 | static int builtin_exit(struct child_prog *child) |
| 509 | { |
| 510 | if (child->argv[1] == NULL) |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 511 | exit(last_return_code); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 512 | exit (atoi(child->argv[1])); |
| 513 | } |
| 514 | |
| 515 | /* built-in 'export VAR=value' handler */ |
| 516 | static int builtin_export(struct child_prog *child) |
| 517 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 518 | int res = 0; |
| 519 | char *name = child->argv[1]; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 520 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 521 | if (name == NULL) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 522 | return (builtin_env(child)); |
| 523 | } |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 524 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 525 | name = strdup(name); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 526 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 527 | if(name) { |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 528 | char *value = strchr(name, '='); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 529 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 530 | if (!value) { |
| 531 | char *tmp; |
| 532 | /* They are exporting something without an =VALUE */ |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 533 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 534 | value = get_local_var(name); |
| 535 | if (value) { |
| 536 | size_t ln = strlen(name); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 537 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 538 | tmp = realloc(name, ln+strlen(value)+2); |
| 539 | if(tmp==NULL) |
| 540 | res = -1; |
| 541 | else { |
| 542 | sprintf(tmp+ln, "=%s", value); |
| 543 | name = tmp; |
| 544 | } |
| 545 | } else { |
| 546 | /* bash does not return an error when trying to export |
| 547 | * an undefined variable. Do likewise. */ |
| 548 | res = 1; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 549 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 550 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 551 | } |
| 552 | if (res<0) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 553 | bb_perror_msg("export"); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 554 | else if(res==0) |
| 555 | res = set_local_var(name, 1); |
| 556 | else |
| 557 | res = 0; |
| 558 | free(name); |
| 559 | return res; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | /* built-in 'fg' and 'bg' handler */ |
| 563 | static int builtin_fg_bg(struct child_prog *child) |
| 564 | { |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 565 | int i, jobnum; |
| 566 | struct pipe *pi=NULL; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 567 | |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 568 | if (!interactive) |
| 569 | return EXIT_FAILURE; |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 570 | /* If they gave us no args, assume they want the last backgrounded task */ |
| 571 | if (!child->argv[1]) { |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 572 | for (pi = job_list; pi; pi = pi->next) { |
| 573 | if (pi->jobid == last_jobid) { |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 574 | break; |
| 575 | } |
| 576 | } |
| 577 | if (!pi) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 578 | bb_error_msg("%s: no current job", child->argv[0]); |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 579 | return EXIT_FAILURE; |
| 580 | } |
| 581 | } else { |
| 582 | if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 583 | bb_error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 584 | return EXIT_FAILURE; |
| 585 | } |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 586 | for (pi = job_list; pi; pi = pi->next) { |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 587 | if (pi->jobid == jobnum) { |
| 588 | break; |
| 589 | } |
| 590 | } |
| 591 | if (!pi) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 592 | bb_error_msg("%s: %d: no such job", child->argv[0], jobnum); |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 593 | return EXIT_FAILURE; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 594 | } |
| 595 | } |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 596 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 597 | if (*child->argv[0] == 'f') { |
Eric Andersen | 028b65b | 2001-06-28 01:10:11 +0000 | [diff] [blame] | 598 | /* Put the job into the foreground. */ |
| 599 | tcsetpgrp(shell_terminal, pi->pgrp); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 600 | } |
| 601 | |
| 602 | /* Restart the processes in the job */ |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 603 | for (i = 0; i < pi->num_progs; i++) |
| 604 | pi->progs[i].is_stopped = 0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 605 | |
Eric Andersen | 028b65b | 2001-06-28 01:10:11 +0000 | [diff] [blame] | 606 | if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { |
| 607 | if (i == ESRCH) { |
| 608 | remove_bg_job(pi); |
| 609 | } else { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 610 | bb_perror_msg("kill (SIGCONT)"); |
Eric Andersen | 028b65b | 2001-06-28 01:10:11 +0000 | [diff] [blame] | 611 | } |
| 612 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 613 | |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 614 | pi->stopped_progs = 0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 615 | return EXIT_SUCCESS; |
| 616 | } |
| 617 | |
| 618 | /* built-in 'help' handler */ |
| 619 | static int builtin_help(struct child_prog *dummy) |
| 620 | { |
"Vladimir N. Oleynik" | 485d7cb | 2005-10-17 09:48:57 +0000 | [diff] [blame] | 621 | const struct built_in_command *x; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 622 | |
| 623 | printf("\nBuilt-in commands:\n"); |
| 624 | printf("-------------------\n"); |
| 625 | for (x = bltins; x->cmd; x++) { |
| 626 | if (x->descr==NULL) |
| 627 | continue; |
| 628 | printf("%s\t%s\n", x->cmd, x->descr); |
| 629 | } |
| 630 | printf("\n\n"); |
| 631 | return EXIT_SUCCESS; |
| 632 | } |
| 633 | |
| 634 | /* built-in 'jobs' handler */ |
| 635 | static int builtin_jobs(struct child_prog *child) |
| 636 | { |
| 637 | struct pipe *job; |
| 638 | char *status_string; |
| 639 | |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 640 | for (job = job_list; job; job = job->next) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 641 | if (job->running_progs == job->stopped_progs) |
| 642 | status_string = "Stopped"; |
| 643 | else |
| 644 | status_string = "Running"; |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 645 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 646 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); |
| 647 | } |
| 648 | return EXIT_SUCCESS; |
| 649 | } |
| 650 | |
| 651 | |
| 652 | /* built-in 'pwd' handler */ |
| 653 | static int builtin_pwd(struct child_prog *dummy) |
| 654 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 655 | puts(set_cwd()); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 656 | return EXIT_SUCCESS; |
| 657 | } |
| 658 | |
| 659 | /* built-in 'read VAR' handler */ |
| 660 | static int builtin_read(struct child_prog *child) |
| 661 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 662 | int res; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 663 | |
| 664 | if (child->argv[1]) { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 665 | char string[BUFSIZ]; |
| 666 | char *var = 0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 667 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 668 | string[0] = 0; /* In case stdin has only EOF */ |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 669 | /* read string */ |
| 670 | fgets(string, sizeof(string), stdin); |
| 671 | chomp(string); |
| 672 | var = malloc(strlen(child->argv[1])+strlen(string)+2); |
| 673 | if(var) { |
| 674 | sprintf(var, "%s=%s", child->argv[1], string); |
| 675 | res = set_local_var(var, 0); |
| 676 | } else |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 677 | res = -1; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 678 | if (res) |
| 679 | fprintf(stderr, "read: %m\n"); |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 680 | free(var); /* So not move up to avoid breaking errno */ |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 681 | return res; |
| 682 | } else { |
| 683 | do res=getchar(); while(res!='\n' && res!=EOF); |
| 684 | return 0; |
| 685 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 686 | } |
| 687 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 688 | /* built-in 'set VAR=value' handler */ |
| 689 | static int builtin_set(struct child_prog *child) |
| 690 | { |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 691 | char *temp = child->argv[1]; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 692 | struct variables *e; |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 693 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 694 | if (temp == NULL) |
| 695 | for(e = top_vars; e; e=e->next) |
| 696 | printf("%s=%s\n", e->name, e->value); |
| 697 | else |
| 698 | set_local_var(temp, 0); |
| 699 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 700 | return EXIT_SUCCESS; |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 704 | /* Built-in 'shift' handler */ |
| 705 | static int builtin_shift(struct child_prog *child) |
| 706 | { |
| 707 | int n=1; |
| 708 | if (child->argv[1]) { |
| 709 | n=atoi(child->argv[1]); |
| 710 | } |
| 711 | if (n>=0 && n<global_argc) { |
| 712 | /* XXX This probably breaks $0 */ |
| 713 | global_argc -= n; |
| 714 | global_argv += n; |
| 715 | return EXIT_SUCCESS; |
| 716 | } else { |
| 717 | return EXIT_FAILURE; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | /* Built-in '.' handler (read-in and execute commands from file) */ |
| 722 | static int builtin_source(struct child_prog *child) |
| 723 | { |
| 724 | FILE *input; |
| 725 | int status; |
| 726 | |
| 727 | if (child->argv[1] == NULL) |
| 728 | return EXIT_FAILURE; |
| 729 | |
| 730 | /* XXX search through $PATH is missing */ |
| 731 | input = fopen(child->argv[1], "r"); |
| 732 | if (!input) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 733 | bb_error_msg("Couldn't open file '%s'", child->argv[1]); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 734 | return EXIT_FAILURE; |
| 735 | } |
| 736 | |
| 737 | /* Now run the file */ |
| 738 | /* XXX argv and argc are broken; need to save old global_argv |
| 739 | * (pointer only is OK!) on this stack frame, |
| 740 | * set global_argv=child->argv+1, recurse, and restore. */ |
| 741 | mark_open(fileno(input)); |
| 742 | status = parse_file_outer(input); |
| 743 | mark_closed(fileno(input)); |
| 744 | fclose(input); |
| 745 | return (status); |
| 746 | } |
| 747 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 748 | static int builtin_umask(struct child_prog *child) |
| 749 | { |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 750 | mode_t new_umask; |
| 751 | const char *arg = child->argv[1]; |
| 752 | char *end; |
| 753 | if (arg) { |
| 754 | new_umask=strtoul(arg, &end, 8); |
| 755 | if (*end!='\0' || end == arg) { |
| 756 | return EXIT_FAILURE; |
| 757 | } |
| 758 | } else { |
| 759 | printf("%.3o\n", (unsigned int) (new_umask=umask(0))); |
| 760 | } |
| 761 | umask(new_umask); |
| 762 | return EXIT_SUCCESS; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 763 | } |
| 764 | |
| 765 | /* built-in 'unset VAR' handler */ |
| 766 | static int builtin_unset(struct child_prog *child) |
| 767 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 768 | /* bash returned already true */ |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 769 | unset_local_var(child->argv[1]); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 770 | return EXIT_SUCCESS; |
| 771 | } |
| 772 | |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 773 | static int builtin_not_written(struct child_prog *child) |
| 774 | { |
| 775 | printf("builtin_%s not written\n",child->argv[0]); |
| 776 | return EXIT_FAILURE; |
| 777 | } |
| 778 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 779 | static int b_check_space(o_string *o, int len) |
| 780 | { |
| 781 | /* It would be easy to drop a more restrictive policy |
| 782 | * in here, such as setting a maximum string length */ |
| 783 | if (o->length + len > o->maxlen) { |
| 784 | char *old_data = o->data; |
| 785 | /* assert (data == NULL || o->maxlen != 0); */ |
| 786 | o->maxlen += max(2*len, B_CHUNK); |
| 787 | o->data = realloc(o->data, 1 + o->maxlen); |
| 788 | if (o->data == NULL) { |
| 789 | free(old_data); |
| 790 | } |
| 791 | } |
| 792 | return o->data == NULL; |
| 793 | } |
| 794 | |
| 795 | static int b_addchr(o_string *o, int ch) |
| 796 | { |
| 797 | debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); |
| 798 | if (b_check_space(o, 1)) return B_NOSPAC; |
| 799 | o->data[o->length] = ch; |
| 800 | o->length++; |
| 801 | o->data[o->length] = '\0'; |
| 802 | return 0; |
| 803 | } |
| 804 | |
| 805 | static void b_reset(o_string *o) |
| 806 | { |
| 807 | o->length = 0; |
| 808 | o->nonnull = 0; |
| 809 | if (o->data != NULL) *o->data = '\0'; |
| 810 | } |
| 811 | |
| 812 | static void b_free(o_string *o) |
| 813 | { |
| 814 | b_reset(o); |
Aaron Lehmann | a170e1c | 2002-11-28 11:27:31 +0000 | [diff] [blame] | 815 | free(o->data); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 816 | o->data = NULL; |
| 817 | o->maxlen = 0; |
| 818 | } |
| 819 | |
| 820 | /* My analysis of quoting semantics tells me that state information |
| 821 | * is associated with a destination, not a source. |
| 822 | */ |
| 823 | static int b_addqchr(o_string *o, int ch, int quote) |
| 824 | { |
| 825 | if (quote && strchr("*?[\\",ch)) { |
| 826 | int rc; |
| 827 | rc = b_addchr(o, '\\'); |
| 828 | if (rc) return rc; |
| 829 | } |
| 830 | return b_addchr(o, ch); |
| 831 | } |
| 832 | |
| 833 | /* belongs in utility.c */ |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 834 | static char *simple_itoa(unsigned int i) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 835 | { |
| 836 | /* 21 digits plus null terminator, good for 64-bit or smaller ints */ |
| 837 | static char local[22]; |
| 838 | char *p = &local[21]; |
| 839 | *p-- = '\0'; |
| 840 | do { |
| 841 | *p-- = '0' + i % 10; |
| 842 | i /= 10; |
| 843 | } while (i > 0); |
| 844 | return p + 1; |
| 845 | } |
| 846 | |
| 847 | static int b_adduint(o_string *o, unsigned int i) |
| 848 | { |
| 849 | int r; |
| 850 | char *p = simple_itoa(i); |
| 851 | /* no escape checking necessary */ |
| 852 | do r=b_addchr(o, *p++); while (r==0 && *p); |
| 853 | return r; |
| 854 | } |
| 855 | |
| 856 | static int static_get(struct in_str *i) |
| 857 | { |
| 858 | int ch=*i->p++; |
| 859 | if (ch=='\0') return EOF; |
| 860 | return ch; |
| 861 | } |
| 862 | |
| 863 | static int static_peek(struct in_str *i) |
| 864 | { |
| 865 | return *i->p; |
| 866 | } |
| 867 | |
| 868 | static inline void cmdedit_set_initial_prompt(void) |
| 869 | { |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 870 | #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 871 | PS1 = NULL; |
| 872 | #else |
| 873 | PS1 = getenv("PS1"); |
| 874 | if(PS1==0) |
| 875 | PS1 = "\\w \\$ "; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 876 | #endif |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 877 | } |
| 878 | |
| 879 | static inline void setup_prompt_string(int promptmode, char **prompt_str) |
| 880 | { |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 881 | debug_printf("setup_prompt_string %d ",promptmode); |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 882 | #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 883 | /* Set up the prompt */ |
| 884 | if (promptmode == 1) { |
Aaron Lehmann | a170e1c | 2002-11-28 11:27:31 +0000 | [diff] [blame] | 885 | free(PS1); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 886 | PS1=xmalloc(strlen(cwd)+4); |
| 887 | sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); |
| 888 | *prompt_str = PS1; |
| 889 | } else { |
| 890 | *prompt_str = PS2; |
| 891 | } |
| 892 | #else |
Glenn L McGrath | 78b0e37 | 2001-06-26 02:06:08 +0000 | [diff] [blame] | 893 | *prompt_str = (promptmode==1)? PS1 : PS2; |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 894 | #endif |
| 895 | debug_printf("result %s\n",*prompt_str); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 896 | } |
| 897 | |
| 898 | static void get_user_input(struct in_str *i) |
| 899 | { |
| 900 | char *prompt_str; |
Eric Andersen | 088875f | 2001-04-27 07:49:41 +0000 | [diff] [blame] | 901 | static char the_command[BUFSIZ]; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 902 | |
| 903 | setup_prompt_string(i->promptmode, &prompt_str); |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 904 | #ifdef CONFIG_FEATURE_COMMAND_EDITING |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 905 | /* |
| 906 | ** enable command line editing only while a command line |
| 907 | ** is actually being read; otherwise, we'll end up bequeathing |
| 908 | ** atexit() handlers and other unwanted stuff to our |
| 909 | ** child processes (rob@sysgo.de) |
| 910 | */ |
| 911 | cmdedit_read_input(prompt_str, the_command); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 912 | #else |
| 913 | fputs(prompt_str, stdout); |
| 914 | fflush(stdout); |
| 915 | the_command[0]=fgetc(i->file); |
| 916 | the_command[1]='\0'; |
| 917 | #endif |
Eric Andersen | 4f6753e | 2001-05-31 17:17:12 +0000 | [diff] [blame] | 918 | fflush(stdout); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 919 | i->p = the_command; |
| 920 | } |
| 921 | |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 922 | /* This is the magic location that prints prompts |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 923 | * and gets data back from the user */ |
| 924 | static int file_get(struct in_str *i) |
| 925 | { |
| 926 | int ch; |
| 927 | |
| 928 | ch = 0; |
| 929 | /* If there is data waiting, eat it up */ |
| 930 | if (i->p && *i->p) { |
| 931 | ch=*i->p++; |
| 932 | } else { |
| 933 | /* need to double check i->file because we might be doing something |
| 934 | * more complicated by now, like sourcing or substituting. */ |
| 935 | if (i->__promptme && interactive && i->file == stdin) { |
Eric Andersen | 4f6753e | 2001-05-31 17:17:12 +0000 | [diff] [blame] | 936 | while(! i->p || (interactive && strlen(i->p)==0) ) { |
| 937 | get_user_input(i); |
| 938 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 939 | i->promptmode=2; |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 940 | i->__promptme = 0; |
| 941 | if (i->p && *i->p) { |
| 942 | ch=*i->p++; |
| 943 | } |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 944 | } else { |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 945 | ch = fgetc(i->file); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 946 | } |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 947 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 948 | debug_printf("b_getch: got a %d\n", ch); |
| 949 | } |
| 950 | if (ch == '\n') i->__promptme=1; |
| 951 | return ch; |
| 952 | } |
| 953 | |
| 954 | /* All the callers guarantee this routine will never be |
| 955 | * used right after a newline, so prompting is not needed. |
| 956 | */ |
| 957 | static int file_peek(struct in_str *i) |
| 958 | { |
| 959 | if (i->p && *i->p) { |
| 960 | return *i->p; |
| 961 | } else { |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 962 | i->peek_buf[0] = fgetc(i->file); |
| 963 | i->peek_buf[1] = '\0'; |
| 964 | i->p = i->peek_buf; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 965 | debug_printf("b_peek: got a %d\n", *i->p); |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 966 | return *i->p; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 967 | } |
| 968 | } |
| 969 | |
| 970 | static void setup_file_in_str(struct in_str *i, FILE *f) |
| 971 | { |
| 972 | i->peek = file_peek; |
| 973 | i->get = file_get; |
| 974 | i->__promptme=1; |
| 975 | i->promptmode=1; |
| 976 | i->file = f; |
| 977 | i->p = NULL; |
| 978 | } |
| 979 | |
| 980 | static void setup_string_in_str(struct in_str *i, const char *s) |
| 981 | { |
| 982 | i->peek = static_peek; |
| 983 | i->get = static_get; |
| 984 | i->__promptme=1; |
| 985 | i->promptmode=1; |
| 986 | i->p = s; |
| 987 | } |
| 988 | |
| 989 | static void mark_open(int fd) |
| 990 | { |
| 991 | struct close_me *new = xmalloc(sizeof(struct close_me)); |
| 992 | new->fd = fd; |
| 993 | new->next = close_me_head; |
| 994 | close_me_head = new; |
| 995 | } |
| 996 | |
| 997 | static void mark_closed(int fd) |
| 998 | { |
| 999 | struct close_me *tmp; |
| 1000 | if (close_me_head == NULL || close_me_head->fd != fd) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1001 | bb_error_msg_and_die("corrupt close_me"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1002 | tmp = close_me_head; |
| 1003 | close_me_head = close_me_head->next; |
| 1004 | free(tmp); |
| 1005 | } |
| 1006 | |
Eric Andersen | eaecbf3 | 2001-10-31 10:41:31 +0000 | [diff] [blame] | 1007 | static void close_all(void) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1008 | { |
| 1009 | struct close_me *c; |
| 1010 | for (c=close_me_head; c; c=c->next) { |
| 1011 | close(c->fd); |
| 1012 | } |
| 1013 | close_me_head = NULL; |
| 1014 | } |
| 1015 | |
| 1016 | /* squirrel != NULL means we squirrel away copies of stdin, stdout, |
| 1017 | * and stderr if they are redirected. */ |
| 1018 | static int setup_redirects(struct child_prog *prog, int squirrel[]) |
| 1019 | { |
| 1020 | int openfd, mode; |
| 1021 | struct redir_struct *redir; |
| 1022 | |
| 1023 | for (redir=prog->redirects; redir; redir=redir->next) { |
Eric Andersen | 817e73c | 2001-06-06 17:56:09 +0000 | [diff] [blame] | 1024 | if (redir->dup == -1 && redir->word.gl_pathv == NULL) { |
| 1025 | /* something went wrong in the parse. Pretend it didn't happen */ |
| 1026 | continue; |
| 1027 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1028 | if (redir->dup == -1) { |
| 1029 | mode=redir_table[redir->type].mode; |
| 1030 | openfd = open(redir->word.gl_pathv[0], mode, 0666); |
| 1031 | if (openfd < 0) { |
| 1032 | /* this could get lost if stderr has been redirected, but |
| 1033 | bash and ash both lose it as well (though zsh doesn't!) */ |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1034 | bb_perror_msg("error opening %s", redir->word.gl_pathv[0]); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1035 | return 1; |
| 1036 | } |
| 1037 | } else { |
| 1038 | openfd = redir->dup; |
| 1039 | } |
| 1040 | |
| 1041 | if (openfd != redir->fd) { |
| 1042 | if (squirrel && redir->fd < 3) { |
| 1043 | squirrel[redir->fd] = dup(redir->fd); |
| 1044 | } |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 1045 | if (openfd == -3) { |
| 1046 | close(openfd); |
| 1047 | } else { |
| 1048 | dup2(openfd, redir->fd); |
Matt Kraai | c616e53 | 2001-06-05 16:50:08 +0000 | [diff] [blame] | 1049 | if (redir->dup == -1) |
| 1050 | close (openfd); |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 1051 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1052 | } |
| 1053 | } |
| 1054 | return 0; |
| 1055 | } |
| 1056 | |
| 1057 | static void restore_redirects(int squirrel[]) |
| 1058 | { |
| 1059 | int i, fd; |
| 1060 | for (i=0; i<3; i++) { |
| 1061 | fd = squirrel[i]; |
| 1062 | if (fd != -1) { |
| 1063 | /* No error checking. I sure wouldn't know what |
| 1064 | * to do with an error if I found one! */ |
| 1065 | dup2(fd, i); |
| 1066 | close(fd); |
| 1067 | } |
| 1068 | } |
| 1069 | } |
| 1070 | |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1071 | /* never returns */ |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1072 | /* XXX no exit() here. If you don't exec, use _exit instead. |
| 1073 | * The at_exit handlers apparently confuse the calling process, |
| 1074 | * in particular stdin handling. Not sure why? */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1075 | static void pseudo_exec(struct child_prog *child) |
| 1076 | { |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1077 | int i, rcode; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1078 | char *p; |
"Vladimir N. Oleynik" | 485d7cb | 2005-10-17 09:48:57 +0000 | [diff] [blame] | 1079 | const struct built_in_command *x; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1080 | if (child->argv) { |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1081 | for (i=0; is_assignment(child->argv[i]); i++) { |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1082 | debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1083 | p = insert_var_value(child->argv[i]); |
| 1084 | putenv(strdup(p)); |
| 1085 | if (p != child->argv[i]) free(p); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1086 | } |
| 1087 | child->argv+=i; /* XXX this hack isn't so horrible, since we are about |
| 1088 | to exit, and therefore don't need to keep data |
| 1089 | structures consistent for free() use. */ |
| 1090 | /* If a variable is assigned in a forest, and nobody listens, |
| 1091 | * was it ever really set? |
| 1092 | */ |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1093 | if (child->argv[0] == NULL) { |
| 1094 | _exit(EXIT_SUCCESS); |
| 1095 | } |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1096 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1097 | /* |
| 1098 | * Check if the command matches any of the builtins. |
| 1099 | * Depending on context, this might be redundant. But it's |
| 1100 | * easier to waste a few CPU cycles than it is to figure out |
| 1101 | * if this is one of those cases. |
| 1102 | */ |
| 1103 | for (x = bltins; x->cmd; x++) { |
| 1104 | if (strcmp(child->argv[0], x->cmd) == 0 ) { |
| 1105 | debug_printf("builtin exec %s\n", child->argv[0]); |
Eric Andersen | 57e6a49 | 2001-05-22 22:34:51 +0000 | [diff] [blame] | 1106 | rcode = x->function(child); |
| 1107 | fflush(stdout); |
| 1108 | _exit(rcode); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1109 | } |
| 1110 | } |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 1111 | |
| 1112 | /* Check if the command matches any busybox internal commands |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1113 | * ("applets") here. |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 1114 | * FIXME: This feature is not 100% safe, since |
| 1115 | * BusyBox is not fully reentrant, so we have no guarantee the things |
| 1116 | * from the .bss are still zeroed, or that things from .data are still |
| 1117 | * at their defaults. We could exec ourself from /proc/self/exe, but I |
| 1118 | * really dislike relying on /proc for things. We could exec ourself |
| 1119 | * from global_argv[0], but if we are in a chroot, we may not be able |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1120 | * to find ourself... */ |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 1121 | #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 1122 | { |
| 1123 | int argc_l; |
| 1124 | char** argv_l=child->argv; |
| 1125 | char *name = child->argv[0]; |
| 1126 | |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 1127 | /* Count argc for use in a second... */ |
| 1128 | for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); |
| 1129 | optind = 1; |
| 1130 | debug_printf("running applet %s\n", name); |
| 1131 | run_applet_by_name(name, argc_l, child->argv); |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 1132 | } |
| 1133 | #endif |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1134 | debug_printf("exec of %s\n",child->argv[0]); |
| 1135 | execvp(child->argv[0],child->argv); |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1136 | bb_perror_msg("couldn't exec: %s",child->argv[0]); |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1137 | _exit(1); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1138 | } else if (child->group) { |
| 1139 | debug_printf("runtime nesting to group\n"); |
| 1140 | interactive=0; /* crucial!!!! */ |
| 1141 | rcode = run_list_real(child->group); |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1142 | /* OK to leak memory by not calling free_pipe_list, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1143 | * since this process is about to exit */ |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1144 | _exit(rcode); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1145 | } else { |
| 1146 | /* Can happen. See what bash does with ">foo" by itself. */ |
| 1147 | debug_printf("trying to pseudo_exec null command\n"); |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1148 | _exit(EXIT_SUCCESS); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1149 | } |
| 1150 | } |
| 1151 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1152 | static void insert_bg_job(struct pipe *pi) |
| 1153 | { |
| 1154 | struct pipe *thejob; |
| 1155 | |
| 1156 | /* Linear search for the ID of the job to use */ |
| 1157 | pi->jobid = 1; |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1158 | for (thejob = job_list; thejob; thejob = thejob->next) |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1159 | if (thejob->jobid >= pi->jobid) |
| 1160 | pi->jobid = thejob->jobid + 1; |
| 1161 | |
| 1162 | /* add thejob to the list of running jobs */ |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1163 | if (!job_list) { |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1164 | thejob = job_list = xmalloc(sizeof(*thejob)); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1165 | } else { |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1166 | for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1167 | thejob->next = xmalloc(sizeof(*thejob)); |
| 1168 | thejob = thejob->next; |
| 1169 | } |
| 1170 | |
| 1171 | /* physically copy the struct job */ |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1172 | memcpy(thejob, pi, sizeof(struct pipe)); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1173 | thejob->next = NULL; |
| 1174 | thejob->running_progs = thejob->num_progs; |
| 1175 | thejob->stopped_progs = 0; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1176 | thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ |
Eric Andersen | 1a6d39b | 2001-05-08 05:11:54 +0000 | [diff] [blame] | 1177 | |
| 1178 | //if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) |
| 1179 | { |
| 1180 | char *bar=thejob->text; |
| 1181 | char **foo=pi->progs[0].argv; |
| 1182 | while(foo && *foo) { |
| 1183 | bar += sprintf(bar, "%s ", *foo++); |
| 1184 | } |
| 1185 | } |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1186 | |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1187 | /* we don't wait for background thejobs to return -- append it |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1188 | to the list of backgrounded thejobs and leave it alone */ |
Eric Andersen | 1a6d39b | 2001-05-08 05:11:54 +0000 | [diff] [blame] | 1189 | printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); |
| 1190 | last_bg_pid = thejob->progs[0].pid; |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1191 | last_jobid = thejob->jobid; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1192 | } |
| 1193 | |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1194 | /* remove a backgrounded job */ |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1195 | static void remove_bg_job(struct pipe *pi) |
| 1196 | { |
| 1197 | struct pipe *prev_pipe; |
| 1198 | |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1199 | if (pi == job_list) { |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1200 | job_list = pi->next; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1201 | } else { |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1202 | prev_pipe = job_list; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1203 | while (prev_pipe->next != pi) |
| 1204 | prev_pipe = prev_pipe->next; |
| 1205 | prev_pipe->next = pi->next; |
| 1206 | } |
Eric Andersen | 028b65b | 2001-06-28 01:10:11 +0000 | [diff] [blame] | 1207 | if (job_list) |
| 1208 | last_jobid = job_list->jobid; |
| 1209 | else |
| 1210 | last_jobid = 0; |
| 1211 | |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1212 | pi->stopped_progs = 0; |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1213 | free_pipe(pi, 0); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1214 | free(pi); |
| 1215 | } |
| 1216 | |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1217 | /* Checks to see if any processes have exited -- if they |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1218 | have, figure out why and see if a job has completed */ |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1219 | static int checkjobs(struct pipe* fg_pipe) |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1220 | { |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1221 | int attributes; |
| 1222 | int status; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1223 | int prognum = 0; |
| 1224 | struct pipe *pi; |
| 1225 | pid_t childpid; |
| 1226 | |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1227 | attributes = WUNTRACED; |
| 1228 | if (fg_pipe==NULL) { |
| 1229 | attributes |= WNOHANG; |
| 1230 | } |
| 1231 | |
| 1232 | while ((childpid = waitpid(-1, &status, attributes)) > 0) { |
| 1233 | if (fg_pipe) { |
| 1234 | int i, rcode = 0; |
| 1235 | for (i=0; i < fg_pipe->num_progs; i++) { |
| 1236 | if (fg_pipe->progs[i].pid == childpid) { |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1237 | if (i==fg_pipe->num_progs-1) |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1238 | rcode=WEXITSTATUS(status); |
| 1239 | (fg_pipe->num_progs)--; |
| 1240 | return(rcode); |
| 1241 | } |
| 1242 | } |
| 1243 | } |
| 1244 | |
| 1245 | for (pi = job_list; pi; pi = pi->next) { |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1246 | prognum = 0; |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1247 | while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { |
| 1248 | prognum++; |
| 1249 | } |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1250 | if (prognum < pi->num_progs) |
| 1251 | break; |
| 1252 | } |
| 1253 | |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1254 | if(pi==NULL) { |
| 1255 | debug_printf("checkjobs: pid %d was not in our list!\n", childpid); |
| 1256 | continue; |
| 1257 | } |
Eric Andersen | aeb44c4 | 2001-05-22 20:29:00 +0000 | [diff] [blame] | 1258 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1259 | if (WIFEXITED(status) || WIFSIGNALED(status)) { |
| 1260 | /* child exited */ |
| 1261 | pi->running_progs--; |
| 1262 | pi->progs[prognum].pid = 0; |
| 1263 | |
| 1264 | if (!pi->running_progs) { |
| 1265 | printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); |
| 1266 | remove_bg_job(pi); |
| 1267 | } |
| 1268 | } else { |
| 1269 | /* child stopped */ |
| 1270 | pi->stopped_progs++; |
| 1271 | pi->progs[prognum].is_stopped = 1; |
| 1272 | |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1273 | #if 0 |
| 1274 | /* Printing this stuff is a pain, since it tends to |
| 1275 | * overwrite the prompt an inconveinient moments. So |
| 1276 | * don't do that. */ |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1277 | if (pi->stopped_progs == pi->num_progs) { |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1278 | printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1279 | } |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1280 | #endif |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1281 | } |
| 1282 | } |
| 1283 | |
Matt Kraai | 80abc45 | 2001-05-02 21:48:17 +0000 | [diff] [blame] | 1284 | if (childpid == -1 && errno != ECHILD) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1285 | bb_perror_msg("waitpid"); |
Matt Kraai | 80abc45 | 2001-05-02 21:48:17 +0000 | [diff] [blame] | 1286 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1287 | /* move the shell to the foreground */ |
Eric Andersen | 028b65b | 2001-06-28 01:10:11 +0000 | [diff] [blame] | 1288 | //if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1289 | // bb_perror_msg("tcsetpgrp-2"); |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1290 | return -1; |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1291 | } |
| 1292 | |
| 1293 | /* Figure out our controlling tty, checking in order stderr, |
| 1294 | * stdin, and stdout. If check_pgrp is set, also check that |
| 1295 | * we belong to the foreground process group associated with |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 1296 | * that tty. The value of shell_terminal is needed in order to call |
| 1297 | * tcsetpgrp(shell_terminal, ...); */ |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 1298 | #if 0 |
| 1299 | static void controlling_tty(int check_pgrp) |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1300 | { |
| 1301 | pid_t curpgrp; |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1302 | |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 1303 | if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 |
| 1304 | && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 |
| 1305 | && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) |
| 1306 | goto shell_terminal_error; |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1307 | |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1308 | if (check_pgrp && curpgrp != getpgid(0)) |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 1309 | goto shell_terminal_error; |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1310 | |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1311 | return; |
| 1312 | |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 1313 | shell_terminal_error: |
| 1314 | shell_terminal = -1; |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1315 | return; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1316 | } |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 1317 | #endif |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1318 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1319 | /* run_pipe_real() starts all the jobs, but doesn't wait for anything |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1320 | * to finish. See checkjobs(). |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1321 | * |
| 1322 | * return code is normally -1, when the caller has to wait for children |
| 1323 | * to finish to determine the exit status of the pipe. If the pipe |
| 1324 | * is a simple builtin command, however, the action is done by the |
| 1325 | * time run_pipe_real returns, and the exit code is provided as the |
| 1326 | * return value. |
| 1327 | * |
| 1328 | * The input of the pipe is always stdin, the output is always |
| 1329 | * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, |
| 1330 | * because it tries to avoid running the command substitution in |
| 1331 | * subshell, when that is in fact necessary. The subshell process |
| 1332 | * now has its stdout directed to the input of the appropriate pipe, |
| 1333 | * so this routine is noticeably simpler. |
| 1334 | */ |
| 1335 | static int run_pipe_real(struct pipe *pi) |
| 1336 | { |
| 1337 | int i; |
| 1338 | int nextin, nextout; |
| 1339 | int pipefds[2]; /* pipefds[0] is for reading */ |
| 1340 | struct child_prog *child; |
"Vladimir N. Oleynik" | 485d7cb | 2005-10-17 09:48:57 +0000 | [diff] [blame] | 1341 | const struct built_in_command *x; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1342 | char *p; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1343 | |
| 1344 | nextin = 0; |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1345 | pi->pgrp = -1; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1346 | |
| 1347 | /* Check if this is a simple builtin (not part of a pipe). |
| 1348 | * Builtins within pipes have to fork anyway, and are handled in |
| 1349 | * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. |
| 1350 | */ |
Eric Andersen | 04407e5 | 2001-06-07 16:42:05 +0000 | [diff] [blame] | 1351 | if (pi->num_progs == 1) child = & (pi->progs[0]); |
| 1352 | if (pi->num_progs == 1 && child->group && child->subshell == 0) { |
| 1353 | int squirrel[] = {-1, -1, -1}; |
| 1354 | int rcode; |
| 1355 | debug_printf("non-subshell grouping\n"); |
| 1356 | setup_redirects(child, squirrel); |
| 1357 | /* XXX could we merge code with following builtin case, |
| 1358 | * by creating a pseudo builtin that calls run_list_real? */ |
| 1359 | rcode = run_list_real(child->group); |
| 1360 | restore_redirects(squirrel); |
| 1361 | return rcode; |
| 1362 | } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1363 | for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } |
| 1364 | if (i!=0 && child->argv[i]==NULL) { |
| 1365 | /* assignments, but no command: set the local environment */ |
| 1366 | for (i=0; child->argv[i]!=NULL; i++) { |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1367 | |
| 1368 | /* Ok, this case is tricky. We have to decide if this is a |
| 1369 | * local variable, or an already exported variable. If it is |
| 1370 | * already exported, we have to export the new value. If it is |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1371 | * not exported, we need only set this as a local variable. |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1372 | * This junk is all to decide whether or not to export this |
| 1373 | * variable. */ |
| 1374 | int export_me=0; |
| 1375 | char *name, *value; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1376 | name = bb_xstrdup(child->argv[i]); |
Eric Andersen | 04407e5 | 2001-06-07 16:42:05 +0000 | [diff] [blame] | 1377 | debug_printf("Local environment set: %s\n", name); |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1378 | value = strchr(name, '='); |
| 1379 | if (value) |
| 1380 | *value=0; |
| 1381 | if ( get_local_var(name)) { |
| 1382 | export_me=1; |
| 1383 | } |
| 1384 | free(name); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1385 | p = insert_var_value(child->argv[i]); |
| 1386 | set_local_var(p, export_me); |
| 1387 | if (p != child->argv[i]) free(p); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1388 | } |
| 1389 | return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ |
| 1390 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1391 | for (i = 0; is_assignment(child->argv[i]); i++) { |
| 1392 | p = insert_var_value(child->argv[i]); |
| 1393 | putenv(strdup(p)); |
| 1394 | if (p != child->argv[i]) { |
| 1395 | child->sp--; |
| 1396 | free(p); |
| 1397 | } |
| 1398 | } |
| 1399 | if (child->sp) { |
| 1400 | char * str = NULL; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1401 | |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1402 | str = make_string((child->argv + i)); |
| 1403 | parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); |
| 1404 | free(str); |
| 1405 | return last_return_code; |
| 1406 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1407 | for (x = bltins; x->cmd; x++) { |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1408 | if (strcmp(child->argv[i], x->cmd) == 0 ) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1409 | int squirrel[] = {-1, -1, -1}; |
| 1410 | int rcode; |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1411 | if (x->function == builtin_exec && child->argv[i+1]==NULL) { |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 1412 | debug_printf("magic exec\n"); |
| 1413 | setup_redirects(child,NULL); |
| 1414 | return EXIT_SUCCESS; |
| 1415 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1416 | debug_printf("builtin inline %s\n", child->argv[0]); |
| 1417 | /* XXX setup_redirects acts on file descriptors, not FILEs. |
| 1418 | * This is perfect for work that comes after exec(). |
| 1419 | * Is it really safe for inline use? Experimentally, |
| 1420 | * things seem to work with glibc. */ |
| 1421 | setup_redirects(child, squirrel); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1422 | child->argv+=i; /* XXX horrible hack */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1423 | rcode = x->function(child); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1424 | child->argv-=i; /* XXX restore hack so free() can work right */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1425 | restore_redirects(squirrel); |
| 1426 | return rcode; |
| 1427 | } |
| 1428 | } |
| 1429 | } |
| 1430 | |
| 1431 | for (i = 0; i < pi->num_progs; i++) { |
| 1432 | child = & (pi->progs[i]); |
| 1433 | |
| 1434 | /* pipes are inserted between pairs of commands */ |
| 1435 | if ((i + 1) < pi->num_progs) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1436 | if (pipe(pipefds)<0) bb_perror_msg_and_die("pipe"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1437 | nextout = pipefds[1]; |
| 1438 | } else { |
| 1439 | nextout=1; |
| 1440 | pipefds[0] = -1; |
| 1441 | } |
| 1442 | |
| 1443 | /* XXX test for failed fork()? */ |
Eric Andersen | e3efc92 | 2004-04-12 17:59:24 +0000 | [diff] [blame] | 1444 | #if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__) |
Eric Andersen | 72f9a42 | 2001-10-28 05:12:20 +0000 | [diff] [blame] | 1445 | if (!(child->pid = fork())) |
| 1446 | #else |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1447 | if (!(child->pid = vfork())) |
Eric Andersen | 72f9a42 | 2001-10-28 05:12:20 +0000 | [diff] [blame] | 1448 | #endif |
| 1449 | { |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 1450 | /* Set the handling for job control signals back to the default. */ |
| 1451 | signal(SIGINT, SIG_DFL); |
| 1452 | signal(SIGQUIT, SIG_DFL); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 1453 | signal(SIGTERM, SIG_DFL); |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 1454 | signal(SIGTSTP, SIG_DFL); |
| 1455 | signal(SIGTTIN, SIG_DFL); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1456 | signal(SIGTTOU, SIG_DFL); |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 1457 | signal(SIGCHLD, SIG_DFL); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1458 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1459 | close_all(); |
| 1460 | |
| 1461 | if (nextin != 0) { |
| 1462 | dup2(nextin, 0); |
| 1463 | close(nextin); |
| 1464 | } |
| 1465 | if (nextout != 1) { |
| 1466 | dup2(nextout, 1); |
| 1467 | close(nextout); |
| 1468 | } |
| 1469 | if (pipefds[0]!=-1) { |
| 1470 | close(pipefds[0]); /* opposite end of our output pipe */ |
| 1471 | } |
| 1472 | |
| 1473 | /* Like bash, explicit redirects override pipes, |
| 1474 | * and the pipe fd is available for dup'ing. */ |
| 1475 | setup_redirects(child,NULL); |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1476 | |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1477 | if (interactive && pi->followup!=PIPE_BG) { |
Eric Andersen | bfae252 | 2001-05-17 00:14:27 +0000 | [diff] [blame] | 1478 | /* If we (the child) win the race, put ourselves in the process |
| 1479 | * group whose leader is the first process in this pipe. */ |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1480 | if (pi->pgrp < 0) { |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1481 | pi->pgrp = getpid(); |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1482 | } |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1483 | if (setpgid(0, pi->pgrp) == 0) { |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1484 | tcsetpgrp(2, pi->pgrp); |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1485 | } |
| 1486 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1487 | |
| 1488 | pseudo_exec(child); |
| 1489 | } |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1490 | |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1491 | |
| 1492 | /* put our child in the process group whose leader is the |
| 1493 | first process in this pipe */ |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1494 | if (pi->pgrp < 0) { |
| 1495 | pi->pgrp = child->pid; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1496 | } |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1497 | /* Don't check for errors. The child may be dead already, |
| 1498 | * in which case setpgid returns error code EACCES. */ |
| 1499 | setpgid(child->pid, pi->pgrp); |
| 1500 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1501 | if (nextin != 0) |
| 1502 | close(nextin); |
| 1503 | if (nextout != 1) |
| 1504 | close(nextout); |
| 1505 | |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1506 | /* If there isn't another process, nextin is garbage |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1507 | but it doesn't matter */ |
| 1508 | nextin = pipefds[0]; |
| 1509 | } |
| 1510 | return -1; |
| 1511 | } |
| 1512 | |
| 1513 | static int run_list_real(struct pipe *pi) |
| 1514 | { |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1515 | char *save_name = NULL; |
| 1516 | char **list = NULL; |
| 1517 | char **save_list = NULL; |
| 1518 | struct pipe *rpipe; |
| 1519 | int flag_rep = 0; |
| 1520 | int save_num_progs; |
| 1521 | int rcode=0, flag_skip=1; |
| 1522 | int flag_restore = 0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1523 | int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 1524 | reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1525 | /* check syntax for "for" */ |
| 1526 | for (rpipe = pi; rpipe; rpipe = rpipe->next) { |
| 1527 | if ((rpipe->r_mode == RES_IN || |
| 1528 | rpipe->r_mode == RES_FOR) && |
| 1529 | (rpipe->next == NULL)) { |
| 1530 | syntax(); |
| 1531 | return 1; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1532 | } |
| 1533 | if ((rpipe->r_mode == RES_IN && |
| 1534 | (rpipe->next->r_mode == RES_IN && |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1535 | rpipe->next->progs->argv != NULL))|| |
| 1536 | (rpipe->r_mode == RES_FOR && |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1537 | rpipe->next->r_mode != RES_IN)) { |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1538 | syntax(); |
| 1539 | return 1; |
| 1540 | } |
| 1541 | } |
| 1542 | for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { |
| 1543 | if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || |
| 1544 | pi->r_mode == RES_FOR) { |
| 1545 | flag_restore = 0; |
| 1546 | if (!rpipe) { |
| 1547 | flag_rep = 0; |
| 1548 | rpipe = pi; |
| 1549 | } |
| 1550 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1551 | rmode = pi->r_mode; |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 1552 | debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1553 | if (rmode == skip_more_in_this_rmode && flag_skip) { |
| 1554 | if (pi->followup == PIPE_SEQ) flag_skip=0; |
| 1555 | continue; |
| 1556 | } |
| 1557 | flag_skip = 1; |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 1558 | skip_more_in_this_rmode = RES_XXXX; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1559 | if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; |
| 1560 | if (rmode == RES_THEN && if_code) continue; |
| 1561 | if (rmode == RES_ELSE && !if_code) continue; |
Eric Andersen | 99fcd16 | 2004-04-12 21:41:29 +0000 | [diff] [blame] | 1562 | if (rmode == RES_ELIF && !if_code) break; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1563 | if (rmode == RES_FOR && pi->num_progs) { |
| 1564 | if (!list) { |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1565 | /* if no variable values after "in" we skip "for" */ |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1566 | if (!pi->next->progs->argv) continue; |
| 1567 | /* create list of variable values */ |
| 1568 | list = make_list_in(pi->next->progs->argv, |
| 1569 | pi->progs->argv[0]); |
| 1570 | save_list = list; |
| 1571 | save_name = pi->progs->argv[0]; |
| 1572 | pi->progs->argv[0] = NULL; |
| 1573 | flag_rep = 1; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1574 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1575 | if (!(*list)) { |
| 1576 | free(pi->progs->argv[0]); |
| 1577 | free(save_list); |
| 1578 | list = NULL; |
| 1579 | flag_rep = 0; |
| 1580 | pi->progs->argv[0] = save_name; |
| 1581 | pi->progs->glob_result.gl_pathv[0] = |
| 1582 | pi->progs->argv[0]; |
| 1583 | continue; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1584 | } else { |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1585 | /* insert new value from list for variable */ |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1586 | if (pi->progs->argv[0]) |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1587 | free(pi->progs->argv[0]); |
| 1588 | pi->progs->argv[0] = *list++; |
| 1589 | pi->progs->glob_result.gl_pathv[0] = |
| 1590 | pi->progs->argv[0]; |
| 1591 | } |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1592 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1593 | if (rmode == RES_IN) continue; |
| 1594 | if (rmode == RES_DO) { |
| 1595 | if (!flag_rep) continue; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1596 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1597 | if ((rmode == RES_DONE)) { |
| 1598 | if (flag_rep) { |
| 1599 | flag_restore = 1; |
| 1600 | } else { |
| 1601 | rpipe = NULL; |
| 1602 | } |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1603 | } |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 1604 | if (pi->num_progs == 0) continue; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1605 | save_num_progs = pi->num_progs; /* save number of programs */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1606 | rcode = run_pipe_real(pi); |
Eric Andersen | 04407e5 | 2001-06-07 16:42:05 +0000 | [diff] [blame] | 1607 | debug_printf("run_pipe_real returned %d\n",rcode); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1608 | if (rcode!=-1) { |
| 1609 | /* We only ran a builtin: rcode was set by the return value |
| 1610 | * of run_pipe_real(), and we don't need to wait for anything. */ |
| 1611 | } else if (pi->followup==PIPE_BG) { |
| 1612 | /* XXX check bash's behavior with nontrivial pipes */ |
| 1613 | /* XXX compute jobid */ |
| 1614 | /* XXX what does bash do with attempts to background builtins? */ |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1615 | insert_bg_job(pi); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1616 | rcode = EXIT_SUCCESS; |
| 1617 | } else { |
| 1618 | if (interactive) { |
| 1619 | /* move the new process group into the foreground */ |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 1620 | if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1621 | bb_perror_msg("tcsetpgrp-3"); |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1622 | rcode = checkjobs(pi); |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1623 | /* move the shell to the foreground */ |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 1624 | if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1625 | bb_perror_msg("tcsetpgrp-4"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1626 | } else { |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 1627 | rcode = checkjobs(pi); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1628 | } |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1629 | debug_printf("checkjobs returned %d\n",rcode); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1630 | } |
| 1631 | last_return_code=rcode; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1632 | pi->num_progs = save_num_progs; /* restore number of programs */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1633 | if ( rmode == RES_IF || rmode == RES_ELIF ) |
| 1634 | next_if_code=rcode; /* can be overwritten a number of times */ |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1635 | if (rmode == RES_WHILE) |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1636 | flag_rep = !last_return_code; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1637 | if (rmode == RES_UNTIL) |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 1638 | flag_rep = last_return_code; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1639 | if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || |
| 1640 | (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 1641 | skip_more_in_this_rmode=rmode; |
Eric Andersen | 028b65b | 2001-06-28 01:10:11 +0000 | [diff] [blame] | 1642 | checkjobs(NULL); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1643 | } |
| 1644 | return rcode; |
| 1645 | } |
| 1646 | |
| 1647 | /* broken, of course, but OK for testing */ |
| 1648 | static char *indenter(int i) |
| 1649 | { |
| 1650 | static char blanks[]=" "; |
| 1651 | return &blanks[sizeof(blanks)-i-1]; |
| 1652 | } |
| 1653 | |
| 1654 | /* return code is the exit status of the pipe */ |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1655 | static int free_pipe(struct pipe *pi, int indent) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1656 | { |
| 1657 | char **p; |
| 1658 | struct child_prog *child; |
| 1659 | struct redir_struct *r, *rnext; |
| 1660 | int a, i, ret_code=0; |
| 1661 | char *ind = indenter(indent); |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 1662 | |
| 1663 | if (pi->stopped_progs > 0) |
| 1664 | return ret_code; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1665 | final_printf("%s run pipe: (pid %d)\n",ind,getpid()); |
| 1666 | for (i=0; i<pi->num_progs; i++) { |
| 1667 | child = &pi->progs[i]; |
| 1668 | final_printf("%s command %d:\n",ind,i); |
| 1669 | if (child->argv) { |
| 1670 | for (a=0,p=child->argv; *p; a++,p++) { |
| 1671 | final_printf("%s argv[%d] = %s\n",ind,a,*p); |
| 1672 | } |
| 1673 | globfree(&child->glob_result); |
| 1674 | child->argv=NULL; |
| 1675 | } else if (child->group) { |
| 1676 | final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1677 | ret_code = free_pipe_list(child->group,indent+3); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1678 | final_printf("%s end group\n",ind); |
| 1679 | } else { |
| 1680 | final_printf("%s (nil)\n",ind); |
| 1681 | } |
| 1682 | for (r=child->redirects; r; r=rnext) { |
| 1683 | final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); |
| 1684 | if (r->dup == -1) { |
Eric Andersen | 817e73c | 2001-06-06 17:56:09 +0000 | [diff] [blame] | 1685 | /* guard against the case >$FOO, where foo is unset or blank */ |
| 1686 | if (r->word.gl_pathv) { |
| 1687 | final_printf(" %s\n", *r->word.gl_pathv); |
| 1688 | globfree(&r->word); |
| 1689 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1690 | } else { |
| 1691 | final_printf("&%d\n", r->dup); |
| 1692 | } |
| 1693 | rnext=r->next; |
| 1694 | free(r); |
| 1695 | } |
| 1696 | child->redirects=NULL; |
| 1697 | } |
| 1698 | free(pi->progs); /* children are an array, they get freed all at once */ |
| 1699 | pi->progs=NULL; |
| 1700 | return ret_code; |
| 1701 | } |
| 1702 | |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1703 | static int free_pipe_list(struct pipe *head, int indent) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1704 | { |
| 1705 | int rcode=0; /* if list has no members */ |
| 1706 | struct pipe *pi, *next; |
| 1707 | char *ind = indenter(indent); |
| 1708 | for (pi=head; pi; pi=next) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1709 | final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1710 | rcode = free_pipe(pi, indent); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1711 | final_printf("%s pipe followup code %d\n", ind, pi->followup); |
| 1712 | next=pi->next; |
| 1713 | pi->next=NULL; |
| 1714 | free(pi); |
| 1715 | } |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1716 | return rcode; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1717 | } |
| 1718 | |
| 1719 | /* Select which version we will use */ |
| 1720 | static int run_list(struct pipe *pi) |
| 1721 | { |
| 1722 | int rcode=0; |
| 1723 | if (fake_mode==0) { |
| 1724 | rcode = run_list_real(pi); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1725 | } |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1726 | /* free_pipe_list has the side effect of clearing memory |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1727 | * In the long run that function can be merged with run_list_real, |
| 1728 | * but doing that now would hobble the debugging effort. */ |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1729 | free_pipe_list(pi,0); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1730 | return rcode; |
| 1731 | } |
| 1732 | |
| 1733 | /* The API for glob is arguably broken. This routine pushes a non-matching |
| 1734 | * string into the output structure, removing non-backslashed backslashes. |
| 1735 | * If someone can prove me wrong, by performing this function within the |
| 1736 | * original glob(3) api, feel free to rewrite this routine into oblivion. |
| 1737 | * Return code (0 vs. GLOB_NOSPACE) matches glob(3). |
| 1738 | * XXX broken if the last character is '\\', check that before calling. |
| 1739 | */ |
| 1740 | static int globhack(const char *src, int flags, glob_t *pglob) |
| 1741 | { |
Eric Andersen | 817e73c | 2001-06-06 17:56:09 +0000 | [diff] [blame] | 1742 | int cnt=0, pathc; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1743 | const char *s; |
| 1744 | char *dest; |
Eric Andersen | 817e73c | 2001-06-06 17:56:09 +0000 | [diff] [blame] | 1745 | for (cnt=1, s=src; s && *s; s++) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1746 | if (*s == '\\') s++; |
| 1747 | cnt++; |
| 1748 | } |
| 1749 | dest = malloc(cnt); |
| 1750 | if (!dest) return GLOB_NOSPACE; |
| 1751 | if (!(flags & GLOB_APPEND)) { |
| 1752 | pglob->gl_pathv=NULL; |
| 1753 | pglob->gl_pathc=0; |
| 1754 | pglob->gl_offs=0; |
| 1755 | pglob->gl_offs=0; |
| 1756 | } |
| 1757 | pathc = ++pglob->gl_pathc; |
| 1758 | pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); |
| 1759 | if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; |
| 1760 | pglob->gl_pathv[pathc-1]=dest; |
| 1761 | pglob->gl_pathv[pathc]=NULL; |
Eric Andersen | 817e73c | 2001-06-06 17:56:09 +0000 | [diff] [blame] | 1762 | for (s=src; s && *s; s++, dest++) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1763 | if (*s == '\\') s++; |
| 1764 | *dest = *s; |
| 1765 | } |
| 1766 | *dest='\0'; |
| 1767 | return 0; |
| 1768 | } |
| 1769 | |
| 1770 | /* XXX broken if the last character is '\\', check that before calling */ |
| 1771 | static int glob_needed(const char *s) |
| 1772 | { |
| 1773 | for (; *s; s++) { |
| 1774 | if (*s == '\\') s++; |
| 1775 | if (strchr("*[?",*s)) return 1; |
| 1776 | } |
| 1777 | return 0; |
| 1778 | } |
| 1779 | |
| 1780 | #if 0 |
| 1781 | static void globprint(glob_t *pglob) |
| 1782 | { |
| 1783 | int i; |
| 1784 | debug_printf("glob_t at %p:\n", pglob); |
| 1785 | debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", |
| 1786 | pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); |
| 1787 | for (i=0; i<pglob->gl_pathc; i++) |
| 1788 | debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, |
| 1789 | pglob->gl_pathv[i], pglob->gl_pathv[i]); |
| 1790 | } |
| 1791 | #endif |
| 1792 | |
| 1793 | static int xglob(o_string *dest, int flags, glob_t *pglob) |
| 1794 | { |
| 1795 | int gr; |
| 1796 | |
| 1797 | /* short-circuit for null word */ |
| 1798 | /* we can code this better when the debug_printf's are gone */ |
| 1799 | if (dest->length == 0) { |
| 1800 | if (dest->nonnull) { |
| 1801 | /* bash man page calls this an "explicit" null */ |
| 1802 | gr = globhack(dest->data, flags, pglob); |
| 1803 | debug_printf("globhack returned %d\n",gr); |
| 1804 | } else { |
| 1805 | return 0; |
| 1806 | } |
| 1807 | } else if (glob_needed(dest->data)) { |
| 1808 | gr = glob(dest->data, flags, NULL, pglob); |
| 1809 | debug_printf("glob returned %d\n",gr); |
| 1810 | if (gr == GLOB_NOMATCH) { |
| 1811 | /* quote removal, or more accurately, backslash removal */ |
| 1812 | gr = globhack(dest->data, flags, pglob); |
| 1813 | debug_printf("globhack returned %d\n",gr); |
| 1814 | } |
| 1815 | } else { |
| 1816 | gr = globhack(dest->data, flags, pglob); |
| 1817 | debug_printf("globhack returned %d\n",gr); |
| 1818 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1819 | if (gr == GLOB_NOSPACE) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1820 | bb_error_msg_and_die("out of memory during glob"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1821 | if (gr != 0) { /* GLOB_ABORTED ? */ |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1822 | bb_error_msg("glob(3) error %d",gr); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1823 | } |
| 1824 | /* globprint(glob_target); */ |
| 1825 | return gr; |
| 1826 | } |
| 1827 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1828 | /* This is used to get/check local shell variables */ |
| 1829 | static char *get_local_var(const char *s) |
| 1830 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1831 | struct variables *cur; |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1832 | |
| 1833 | if (!s) |
| 1834 | return NULL; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1835 | for (cur = top_vars; cur; cur=cur->next) |
| 1836 | if(strcmp(cur->name, s)==0) |
| 1837 | return cur->value; |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1838 | return NULL; |
| 1839 | } |
| 1840 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1841 | /* This is used to set local shell variables |
| 1842 | flg_export==0 if only local (not exporting) variable |
| 1843 | flg_export==1 if "new" exporting environ |
| 1844 | flg_export>1 if current startup environ (not call putenv()) */ |
| 1845 | static int set_local_var(const char *s, int flg_export) |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1846 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1847 | char *name, *value; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1848 | int result=0; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1849 | struct variables *cur; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1850 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1851 | name=strdup(s); |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1852 | |
| 1853 | /* Assume when we enter this function that we are already in |
| 1854 | * NAME=VALUE format. So the first order of business is to |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1855 | * split 's' on the '=' into 'name' and 'value' */ |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1856 | value = strchr(name, '='); |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1857 | if (value==0 && ++value==0) { |
| 1858 | free(name); |
| 1859 | return -1; |
| 1860 | } |
| 1861 | *value++ = 0; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1862 | |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1863 | for(cur = top_vars; cur; cur = cur->next) { |
| 1864 | if(strcmp(cur->name, name)==0) |
| 1865 | break; |
| 1866 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1867 | |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1868 | if(cur) { |
| 1869 | if(strcmp(cur->value, value)==0) { |
| 1870 | if(flg_export>0 && cur->flg_export==0) |
| 1871 | cur->flg_export=flg_export; |
| 1872 | else |
| 1873 | result++; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1874 | } else { |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1875 | if(cur->flg_read_only) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1876 | bb_error_msg("%s: readonly variable", name); |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1877 | result = -1; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1878 | } else { |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1879 | if(flg_export>0 || cur->flg_export>1) |
| 1880 | cur->flg_export=1; |
| 1881 | free(cur->value); |
| 1882 | |
| 1883 | cur->value = strdup(value); |
| 1884 | } |
| 1885 | } |
| 1886 | } else { |
| 1887 | cur = malloc(sizeof(struct variables)); |
| 1888 | if(!cur) { |
| 1889 | result = -1; |
| 1890 | } else { |
| 1891 | cur->name = strdup(name); |
| 1892 | if(cur->name == 0) { |
| 1893 | free(cur); |
| 1894 | result = -1; |
| 1895 | } else { |
| 1896 | struct variables *bottom = top_vars; |
| 1897 | cur->value = strdup(value); |
| 1898 | cur->next = 0; |
| 1899 | cur->flg_export = flg_export; |
| 1900 | cur->flg_read_only = 0; |
| 1901 | while(bottom->next) bottom=bottom->next; |
| 1902 | bottom->next = cur; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1903 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1904 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1905 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1906 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1907 | if(result==0 && cur->flg_export==1) { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1908 | *(value-1) = '='; |
| 1909 | result = putenv(name); |
| 1910 | } else { |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1911 | free(name); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1912 | if(result>0) /* equivalent to previous set */ |
| 1913 | result = 0; |
| 1914 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1915 | return result; |
| 1916 | } |
| 1917 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1918 | static void unset_local_var(const char *name) |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1919 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1920 | struct variables *cur; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1921 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1922 | if (name) { |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1923 | for (cur = top_vars; cur; cur=cur->next) { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1924 | if(strcmp(cur->name, name)==0) |
| 1925 | break; |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1926 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1927 | if(cur!=0) { |
| 1928 | struct variables *next = top_vars; |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1929 | if(cur->flg_read_only) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1930 | bb_error_msg("%s: readonly variable", name); |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1931 | return; |
| 1932 | } else { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1933 | if(cur->flg_export) |
| 1934 | unsetenv(cur->name); |
| 1935 | free(cur->name); |
| 1936 | free(cur->value); |
| 1937 | while (next->next != cur) |
| 1938 | next = next->next; |
| 1939 | next->next = cur->next; |
| 1940 | } |
| 1941 | free(cur); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1942 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1943 | } |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1944 | } |
| 1945 | |
| 1946 | static int is_assignment(const char *s) |
| 1947 | { |
| 1948 | if (s==NULL || !isalpha(*s)) return 0; |
| 1949 | ++s; |
| 1950 | while(isalnum(*s) || *s=='_') ++s; |
| 1951 | return *s=='='; |
| 1952 | } |
| 1953 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1954 | /* the src parameter allows us to peek forward to a possible &n syntax |
| 1955 | * for file descriptor duplication, e.g., "2>&1". |
| 1956 | * Return code is 0 normally, 1 if a syntax error is detected in src. |
| 1957 | * Resource errors (in xmalloc) cause the process to exit */ |
| 1958 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style, |
| 1959 | struct in_str *input) |
| 1960 | { |
| 1961 | struct child_prog *child=ctx->child; |
| 1962 | struct redir_struct *redir = child->redirects; |
| 1963 | struct redir_struct *last_redir=NULL; |
| 1964 | |
| 1965 | /* Create a new redir_struct and drop it onto the end of the linked list */ |
| 1966 | while(redir) { |
| 1967 | last_redir=redir; |
| 1968 | redir=redir->next; |
| 1969 | } |
| 1970 | redir = xmalloc(sizeof(struct redir_struct)); |
| 1971 | redir->next=NULL; |
Eric Andersen | 817e73c | 2001-06-06 17:56:09 +0000 | [diff] [blame] | 1972 | redir->word.gl_pathv=NULL; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1973 | if (last_redir) { |
| 1974 | last_redir->next=redir; |
| 1975 | } else { |
| 1976 | child->redirects=redir; |
| 1977 | } |
| 1978 | |
| 1979 | redir->type=style; |
| 1980 | redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; |
| 1981 | |
| 1982 | debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); |
| 1983 | |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 1984 | /* Check for a '2>&1' type redirect */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1985 | redir->dup = redirect_dup_num(input); |
| 1986 | if (redir->dup == -2) return 1; /* syntax error */ |
| 1987 | if (redir->dup != -1) { |
| 1988 | /* Erik had a check here that the file descriptor in question |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 1989 | * is legit; I postpone that to "run time" |
| 1990 | * A "-" representation of "close me" shows up as a -3 here */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1991 | debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); |
| 1992 | } else { |
| 1993 | /* We do _not_ try to open the file that src points to, |
| 1994 | * since we need to return and let src be expanded first. |
| 1995 | * Set ctx->pending_redirect, so we know what to do at the |
| 1996 | * end of the next parsed word. |
| 1997 | */ |
| 1998 | ctx->pending_redirect = redir; |
| 1999 | } |
| 2000 | return 0; |
| 2001 | } |
| 2002 | |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 2003 | static struct pipe *new_pipe(void) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2004 | struct pipe *pi; |
| 2005 | pi = xmalloc(sizeof(struct pipe)); |
| 2006 | pi->num_progs = 0; |
| 2007 | pi->progs = NULL; |
| 2008 | pi->next = NULL; |
| 2009 | pi->followup = 0; /* invalid */ |
| 2010 | return pi; |
| 2011 | } |
| 2012 | |
| 2013 | static void initialize_context(struct p_context *ctx) |
| 2014 | { |
| 2015 | ctx->pipe=NULL; |
| 2016 | ctx->pending_redirect=NULL; |
| 2017 | ctx->child=NULL; |
| 2018 | ctx->list_head=new_pipe(); |
| 2019 | ctx->pipe=ctx->list_head; |
| 2020 | ctx->w=RES_NONE; |
| 2021 | ctx->stack=NULL; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2022 | ctx->old_flag=0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2023 | done_command(ctx); /* creates the memory for working child */ |
| 2024 | } |
| 2025 | |
| 2026 | /* normal return is 0 |
| 2027 | * if a reserved word is found, and processed, return 1 |
| 2028 | * should handle if, then, elif, else, fi, for, while, until, do, done. |
| 2029 | * case, function, and select are obnoxious, save those for later. |
| 2030 | */ |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 2031 | static int reserved_word(o_string *dest, struct p_context *ctx) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2032 | { |
| 2033 | struct reserved_combo { |
| 2034 | char *literal; |
| 2035 | int code; |
| 2036 | long flag; |
| 2037 | }; |
| 2038 | /* Mostly a list of accepted follow-up reserved words. |
| 2039 | * FLAG_END means we are done with the sequence, and are ready |
| 2040 | * to turn the compound list into a command. |
| 2041 | * FLAG_START means the word must start a new compound list. |
| 2042 | */ |
| 2043 | static struct reserved_combo reserved_list[] = { |
| 2044 | { "if", RES_IF, FLAG_THEN | FLAG_START }, |
| 2045 | { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, |
| 2046 | { "elif", RES_ELIF, FLAG_THEN }, |
| 2047 | { "else", RES_ELSE, FLAG_FI }, |
| 2048 | { "fi", RES_FI, FLAG_END }, |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2049 | { "for", RES_FOR, FLAG_IN | FLAG_START }, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2050 | { "while", RES_WHILE, FLAG_DO | FLAG_START }, |
| 2051 | { "until", RES_UNTIL, FLAG_DO | FLAG_START }, |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2052 | { "in", RES_IN, FLAG_DO }, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2053 | { "do", RES_DO, FLAG_DONE }, |
| 2054 | { "done", RES_DONE, FLAG_END } |
| 2055 | }; |
| 2056 | struct reserved_combo *r; |
| 2057 | for (r=reserved_list; |
| 2058 | #define NRES sizeof(reserved_list)/sizeof(struct reserved_combo) |
| 2059 | r<reserved_list+NRES; r++) { |
| 2060 | if (strcmp(dest->data, r->literal) == 0) { |
| 2061 | debug_printf("found reserved word %s, code %d\n",r->literal,r->code); |
| 2062 | if (r->flag & FLAG_START) { |
| 2063 | struct p_context *new = xmalloc(sizeof(struct p_context)); |
| 2064 | debug_printf("push stack\n"); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2065 | if (ctx->w == RES_IN || ctx->w == RES_FOR) { |
| 2066 | syntax(); |
| 2067 | free(new); |
| 2068 | ctx->w = RES_SNTX; |
| 2069 | b_reset(dest); |
| 2070 | return 1; |
| 2071 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2072 | *new = *ctx; /* physical copy */ |
| 2073 | initialize_context(ctx); |
| 2074 | ctx->stack=new; |
| 2075 | } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 2076 | syntax(); |
| 2077 | ctx->w = RES_SNTX; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2078 | b_reset(dest); |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 2079 | return 1; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2080 | } |
| 2081 | ctx->w=r->code; |
| 2082 | ctx->old_flag = r->flag; |
| 2083 | if (ctx->old_flag & FLAG_END) { |
| 2084 | struct p_context *old; |
| 2085 | debug_printf("pop stack\n"); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2086 | done_pipe(ctx,PIPE_SEQ); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2087 | old = ctx->stack; |
| 2088 | old->child->group = ctx->list_head; |
Eric Andersen | 04407e5 | 2001-06-07 16:42:05 +0000 | [diff] [blame] | 2089 | old->child->subshell = 0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2090 | *ctx = *old; /* physical copy */ |
| 2091 | free(old); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2092 | } |
| 2093 | b_reset (dest); |
| 2094 | return 1; |
| 2095 | } |
| 2096 | } |
| 2097 | return 0; |
| 2098 | } |
| 2099 | |
| 2100 | /* normal return is 0. |
| 2101 | * Syntax or xglob errors return 1. */ |
| 2102 | static int done_word(o_string *dest, struct p_context *ctx) |
| 2103 | { |
| 2104 | struct child_prog *child=ctx->child; |
| 2105 | glob_t *glob_target; |
| 2106 | int gr, flags = 0; |
| 2107 | |
| 2108 | debug_printf("done_word: %s %p\n", dest->data, child); |
| 2109 | if (dest->length == 0 && !dest->nonnull) { |
| 2110 | debug_printf(" true null, ignored\n"); |
| 2111 | return 0; |
| 2112 | } |
| 2113 | if (ctx->pending_redirect) { |
| 2114 | glob_target = &ctx->pending_redirect->word; |
| 2115 | } else { |
| 2116 | if (child->group) { |
| 2117 | syntax(); |
| 2118 | return 1; /* syntax error, groups and arglists don't mix */ |
| 2119 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2120 | if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2121 | debug_printf("checking %s for reserved-ness\n",dest->data); |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 2122 | if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2123 | } |
| 2124 | glob_target = &child->glob_result; |
| 2125 | if (child->argv) flags |= GLOB_APPEND; |
| 2126 | } |
| 2127 | gr = xglob(dest, flags, glob_target); |
| 2128 | if (gr != 0) return 1; |
| 2129 | |
| 2130 | b_reset(dest); |
| 2131 | if (ctx->pending_redirect) { |
| 2132 | ctx->pending_redirect=NULL; |
| 2133 | if (glob_target->gl_pathc != 1) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 2134 | bb_error_msg("ambiguous redirect"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2135 | return 1; |
| 2136 | } |
| 2137 | } else { |
| 2138 | child->argv = glob_target->gl_pathv; |
| 2139 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2140 | if (ctx->w == RES_FOR) { |
| 2141 | done_word(dest,ctx); |
| 2142 | done_pipe(ctx,PIPE_SEQ); |
| 2143 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2144 | return 0; |
| 2145 | } |
| 2146 | |
| 2147 | /* The only possible error here is out of memory, in which case |
| 2148 | * xmalloc exits. */ |
| 2149 | static int done_command(struct p_context *ctx) |
| 2150 | { |
| 2151 | /* The child is really already in the pipe structure, so |
| 2152 | * advance the pipe counter and make a new, null child. |
| 2153 | * Only real trickiness here is that the uncommitted |
| 2154 | * child structure, to which ctx->child points, is not |
| 2155 | * counted in pi->num_progs. */ |
| 2156 | struct pipe *pi=ctx->pipe; |
| 2157 | struct child_prog *prog=ctx->child; |
| 2158 | |
| 2159 | if (prog && prog->group == NULL |
| 2160 | && prog->argv == NULL |
| 2161 | && prog->redirects == NULL) { |
| 2162 | debug_printf("done_command: skipping null command\n"); |
| 2163 | return 0; |
| 2164 | } else if (prog) { |
| 2165 | pi->num_progs++; |
| 2166 | debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); |
| 2167 | } else { |
| 2168 | debug_printf("done_command: initializing\n"); |
| 2169 | } |
| 2170 | pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); |
| 2171 | |
| 2172 | prog = pi->progs + pi->num_progs; |
| 2173 | prog->redirects = NULL; |
| 2174 | prog->argv = NULL; |
| 2175 | prog->is_stopped = 0; |
| 2176 | prog->group = NULL; |
| 2177 | prog->glob_result.gl_pathv = NULL; |
| 2178 | prog->family = pi; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2179 | prog->sp = 0; |
| 2180 | ctx->child = prog; |
| 2181 | prog->type = ctx->type; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2182 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2183 | /* but ctx->pipe and ctx->list_head remain unchanged */ |
| 2184 | return 0; |
| 2185 | } |
| 2186 | |
| 2187 | static int done_pipe(struct p_context *ctx, pipe_style type) |
| 2188 | { |
| 2189 | struct pipe *new_p; |
| 2190 | done_command(ctx); /* implicit closure of previous command */ |
| 2191 | debug_printf("done_pipe, type %d\n", type); |
| 2192 | ctx->pipe->followup = type; |
| 2193 | ctx->pipe->r_mode = ctx->w; |
| 2194 | new_p=new_pipe(); |
| 2195 | ctx->pipe->next = new_p; |
| 2196 | ctx->pipe = new_p; |
| 2197 | ctx->child = NULL; |
| 2198 | done_command(ctx); /* set up new pipe to accept commands */ |
| 2199 | return 0; |
| 2200 | } |
| 2201 | |
| 2202 | /* peek ahead in the in_str to find out if we have a "&n" construct, |
| 2203 | * as in "2>&1", that represents duplicating a file descriptor. |
| 2204 | * returns either -2 (syntax error), -1 (no &), or the number found. |
| 2205 | */ |
| 2206 | static int redirect_dup_num(struct in_str *input) |
| 2207 | { |
| 2208 | int ch, d=0, ok=0; |
| 2209 | ch = b_peek(input); |
| 2210 | if (ch != '&') return -1; |
| 2211 | |
| 2212 | b_getch(input); /* get the & */ |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 2213 | ch=b_peek(input); |
| 2214 | if (ch == '-') { |
| 2215 | b_getch(input); |
| 2216 | return -3; /* "-" represents "close me" */ |
| 2217 | } |
| 2218 | while (isdigit(ch)) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2219 | d = d*10+(ch-'0'); |
| 2220 | ok=1; |
| 2221 | b_getch(input); |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 2222 | ch = b_peek(input); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2223 | } |
| 2224 | if (ok) return d; |
| 2225 | |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 2226 | bb_error_msg("ambiguous redirect"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2227 | return -2; |
| 2228 | } |
| 2229 | |
| 2230 | /* If a redirect is immediately preceded by a number, that number is |
| 2231 | * supposed to tell which file descriptor to redirect. This routine |
| 2232 | * looks for such preceding numbers. In an ideal world this routine |
| 2233 | * needs to handle all the following classes of redirects... |
| 2234 | * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo |
| 2235 | * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo |
| 2236 | * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo |
| 2237 | * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo |
| 2238 | * A -1 output from this program means no valid number was found, so the |
| 2239 | * caller should use the appropriate default for this redirection. |
| 2240 | */ |
| 2241 | static int redirect_opt_num(o_string *o) |
| 2242 | { |
| 2243 | int num; |
| 2244 | |
| 2245 | if (o->length==0) return -1; |
| 2246 | for(num=0; num<o->length; num++) { |
| 2247 | if (!isdigit(*(o->data+num))) { |
| 2248 | return -1; |
| 2249 | } |
| 2250 | } |
| 2251 | /* reuse num (and save an int) */ |
| 2252 | num=atoi(o->data); |
| 2253 | b_reset(o); |
| 2254 | return num; |
| 2255 | } |
| 2256 | |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 2257 | static FILE *generate_stream_from_list(struct pipe *head) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2258 | { |
| 2259 | FILE *pf; |
| 2260 | #if 1 |
| 2261 | int pid, channel[2]; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 2262 | if (pipe(channel)<0) bb_perror_msg_and_die("pipe"); |
Eric Andersen | e3efc92 | 2004-04-12 17:59:24 +0000 | [diff] [blame] | 2263 | #if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2264 | pid=fork(); |
Eric Andersen | 72f9a42 | 2001-10-28 05:12:20 +0000 | [diff] [blame] | 2265 | #else |
| 2266 | pid=vfork(); |
| 2267 | #endif |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2268 | if (pid<0) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 2269 | bb_perror_msg_and_die("fork"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2270 | } else if (pid==0) { |
| 2271 | close(channel[0]); |
| 2272 | if (channel[1] != 1) { |
| 2273 | dup2(channel[1],1); |
| 2274 | close(channel[1]); |
| 2275 | } |
| 2276 | #if 0 |
| 2277 | #define SURROGATE "surrogate response" |
| 2278 | write(1,SURROGATE,sizeof(SURROGATE)); |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2279 | _exit(run_list(head)); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2280 | #else |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2281 | _exit(run_list_real(head)); /* leaks memory */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2282 | #endif |
| 2283 | } |
| 2284 | debug_printf("forked child %d\n",pid); |
| 2285 | close(channel[1]); |
| 2286 | pf = fdopen(channel[0],"r"); |
| 2287 | debug_printf("pipe on FILE *%p\n",pf); |
| 2288 | #else |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 2289 | free_pipe_list(head,0); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2290 | pf=popen("echo surrogate response","r"); |
| 2291 | debug_printf("started fake pipe on FILE *%p\n",pf); |
| 2292 | #endif |
| 2293 | return pf; |
| 2294 | } |
| 2295 | |
| 2296 | /* this version hacked for testing purposes */ |
| 2297 | /* return code is exit status of the process that is run. */ |
| 2298 | static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) |
| 2299 | { |
| 2300 | int retcode; |
| 2301 | o_string result=NULL_O_STRING; |
| 2302 | struct p_context inner; |
| 2303 | FILE *p; |
| 2304 | struct in_str pipe_str; |
| 2305 | initialize_context(&inner); |
| 2306 | |
| 2307 | /* recursion to generate command */ |
| 2308 | retcode = parse_stream(&result, &inner, input, subst_end); |
| 2309 | if (retcode != 0) return retcode; /* syntax error or EOF */ |
| 2310 | done_word(&result, &inner); |
| 2311 | done_pipe(&inner, PIPE_SEQ); |
| 2312 | b_free(&result); |
| 2313 | |
| 2314 | p=generate_stream_from_list(inner.list_head); |
| 2315 | if (p==NULL) return 1; |
| 2316 | mark_open(fileno(p)); |
| 2317 | setup_file_in_str(&pipe_str, p); |
| 2318 | |
| 2319 | /* now send results of command back into original context */ |
| 2320 | retcode = parse_stream(dest, ctx, &pipe_str, '\0'); |
| 2321 | /* XXX In case of a syntax error, should we try to kill the child? |
| 2322 | * That would be tough to do right, so just read until EOF. */ |
| 2323 | if (retcode == 1) { |
| 2324 | while (b_getch(&pipe_str)!=EOF) { /* discard */ }; |
| 2325 | } |
| 2326 | |
| 2327 | debug_printf("done reading from pipe, pclose()ing\n"); |
| 2328 | /* This is the step that wait()s for the child. Should be pretty |
| 2329 | * safe, since we just read an EOF from its stdout. We could try |
| 2330 | * to better, by using wait(), and keeping track of background jobs |
| 2331 | * at the same time. That would be a lot of work, and contrary |
| 2332 | * to the KISS philosophy of this program. */ |
| 2333 | mark_closed(fileno(p)); |
| 2334 | retcode=pclose(p); |
Eric Andersen | a15dc15 | 2001-05-23 23:46:09 +0000 | [diff] [blame] | 2335 | free_pipe_list(inner.list_head,0); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2336 | debug_printf("pclosed, retcode=%d\n",retcode); |
| 2337 | /* XXX this process fails to trim a single trailing newline */ |
| 2338 | return retcode; |
| 2339 | } |
| 2340 | |
| 2341 | static int parse_group(o_string *dest, struct p_context *ctx, |
| 2342 | struct in_str *input, int ch) |
| 2343 | { |
| 2344 | int rcode, endch=0; |
| 2345 | struct p_context sub; |
| 2346 | struct child_prog *child = ctx->child; |
| 2347 | if (child->argv) { |
| 2348 | syntax(); |
| 2349 | return 1; /* syntax error, groups and arglists don't mix */ |
| 2350 | } |
| 2351 | initialize_context(&sub); |
| 2352 | switch(ch) { |
| 2353 | case '(': endch=')'; child->subshell=1; break; |
| 2354 | case '{': endch='}'; break; |
| 2355 | default: syntax(); /* really logic error */ |
| 2356 | } |
| 2357 | rcode=parse_stream(dest,&sub,input,endch); |
| 2358 | done_word(dest,&sub); /* finish off the final word in the subcontext */ |
| 2359 | done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ |
| 2360 | child->group = sub.list_head; |
| 2361 | return rcode; |
| 2362 | /* child remains "open", available for possible redirects */ |
| 2363 | } |
| 2364 | |
| 2365 | /* basically useful version until someone wants to get fancier, |
| 2366 | * see the bash man page under "Parameter Expansion" */ |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2367 | static char *lookup_param(char *src) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2368 | { |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2369 | char *p=NULL; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2370 | if (src) { |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2371 | p = getenv(src); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2372 | if (!p) |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2373 | p = get_local_var(src); |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 2374 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2375 | return p; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2376 | } |
| 2377 | |
| 2378 | /* return code: 0 for OK, 1 for syntax error */ |
| 2379 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) |
| 2380 | { |
| 2381 | int i, advance=0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2382 | char sep[]=" "; |
| 2383 | int ch = input->peek(input); /* first character after the $ */ |
| 2384 | debug_printf("handle_dollar: ch=%c\n",ch); |
| 2385 | if (isalpha(ch)) { |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2386 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 2387 | ctx->child->sp++; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2388 | while(ch=b_peek(input),isalnum(ch) || ch=='_') { |
| 2389 | b_getch(input); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2390 | b_addchr(dest,ch); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2391 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2392 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2393 | } else if (isdigit(ch)) { |
| 2394 | i = ch-'0'; /* XXX is $0 special? */ |
| 2395 | if (i<global_argc) { |
| 2396 | parse_string(dest, ctx, global_argv[i]); /* recursion */ |
| 2397 | } |
| 2398 | advance = 1; |
| 2399 | } else switch (ch) { |
| 2400 | case '$': |
| 2401 | b_adduint(dest,getpid()); |
| 2402 | advance = 1; |
| 2403 | break; |
| 2404 | case '!': |
| 2405 | if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); |
| 2406 | advance = 1; |
| 2407 | break; |
| 2408 | case '?': |
| 2409 | b_adduint(dest,last_return_code); |
| 2410 | advance = 1; |
| 2411 | break; |
| 2412 | case '#': |
| 2413 | b_adduint(dest,global_argc ? global_argc-1 : 0); |
| 2414 | advance = 1; |
| 2415 | break; |
| 2416 | case '{': |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2417 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 2418 | ctx->child->sp++; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2419 | b_getch(input); |
| 2420 | /* XXX maybe someone will try to escape the '}' */ |
| 2421 | while(ch=b_getch(input),ch!=EOF && ch!='}') { |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2422 | b_addchr(dest,ch); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2423 | } |
| 2424 | if (ch != '}') { |
| 2425 | syntax(); |
| 2426 | return 1; |
| 2427 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2428 | b_addchr(dest, SPECIAL_VAR_SYMBOL); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2429 | break; |
| 2430 | case '(': |
Matt Kraai | 9f8caf1 | 2001-05-02 16:26:12 +0000 | [diff] [blame] | 2431 | b_getch(input); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2432 | process_command_subs(dest, ctx, input, ')'); |
| 2433 | break; |
| 2434 | case '*': |
| 2435 | sep[0]=ifs[0]; |
| 2436 | for (i=1; i<global_argc; i++) { |
| 2437 | parse_string(dest, ctx, global_argv[i]); |
| 2438 | if (i+1 < global_argc) parse_string(dest, ctx, sep); |
| 2439 | } |
| 2440 | break; |
| 2441 | case '@': |
| 2442 | case '-': |
| 2443 | case '_': |
| 2444 | /* still unhandled, but should be eventually */ |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 2445 | bb_error_msg("unhandled syntax: $%c",ch); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2446 | return 1; |
| 2447 | break; |
| 2448 | default: |
| 2449 | b_addqchr(dest,'$',dest->quote); |
| 2450 | } |
| 2451 | /* Eat the character if the flag was set. If the compiler |
| 2452 | * is smart enough, we could substitute "b_getch(input);" |
| 2453 | * for all the "advance = 1;" above, and also end up with |
| 2454 | * a nice size-optimized program. Hah! That'll be the day. |
| 2455 | */ |
| 2456 | if (advance) b_getch(input); |
| 2457 | return 0; |
| 2458 | } |
| 2459 | |
| 2460 | int parse_string(o_string *dest, struct p_context *ctx, const char *src) |
| 2461 | { |
| 2462 | struct in_str foo; |
| 2463 | setup_string_in_str(&foo, src); |
| 2464 | return parse_stream(dest, ctx, &foo, '\0'); |
| 2465 | } |
| 2466 | |
| 2467 | /* return code is 0 for normal exit, 1 for syntax error */ |
| 2468 | int parse_stream(o_string *dest, struct p_context *ctx, |
| 2469 | struct in_str *input, int end_trigger) |
| 2470 | { |
| 2471 | unsigned int ch, m; |
| 2472 | int redir_fd; |
| 2473 | redir_type redir_style; |
| 2474 | int next; |
| 2475 | |
| 2476 | /* Only double-quote state is handled in the state variable dest->quote. |
| 2477 | * A single-quote triggers a bypass of the main loop until its mate is |
| 2478 | * found. When recursing, quote state is passed in via dest->quote. */ |
| 2479 | |
| 2480 | debug_printf("parse_stream, end_trigger=%d\n",end_trigger); |
| 2481 | while ((ch=b_getch(input))!=EOF) { |
| 2482 | m = map[ch]; |
| 2483 | next = (ch == '\n') ? 0 : b_peek(input); |
| 2484 | debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d\n", |
| 2485 | ch,ch,m,dest->quote); |
| 2486 | if (m==0 || ((m==1 || m==2) && dest->quote)) { |
| 2487 | b_addqchr(dest, ch, dest->quote); |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 2488 | } else { |
| 2489 | if (m==2) { /* unquoted IFS */ |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2490 | if (done_word(dest, ctx)) { |
| 2491 | return 1; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2492 | } |
Matt Kraai | 20a3069 | 2001-05-02 17:52:49 +0000 | [diff] [blame] | 2493 | /* If we aren't performing a substitution, treat a newline as a |
| 2494 | * command separator. */ |
| 2495 | if (end_trigger != '\0' && ch=='\n') |
| 2496 | done_pipe(ctx,PIPE_SEQ); |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 2497 | } |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 2498 | if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 2499 | debug_printf("leaving parse_stream (triggered)\n"); |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 2500 | return 0; |
| 2501 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2502 | #if 0 |
| 2503 | if (ch=='\n') { |
| 2504 | /* Yahoo! Time to run with it! */ |
| 2505 | done_pipe(ctx,PIPE_SEQ); |
| 2506 | run_list(ctx->list_head); |
| 2507 | initialize_context(ctx); |
| 2508 | } |
| 2509 | #endif |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 2510 | if (m!=2) switch (ch) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2511 | case '#': |
| 2512 | if (dest->length == 0 && !dest->quote) { |
| 2513 | while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } |
| 2514 | } else { |
| 2515 | b_addqchr(dest, ch, dest->quote); |
| 2516 | } |
| 2517 | break; |
| 2518 | case '\\': |
| 2519 | if (next == EOF) { |
| 2520 | syntax(); |
| 2521 | return 1; |
| 2522 | } |
| 2523 | b_addqchr(dest, '\\', dest->quote); |
| 2524 | b_addqchr(dest, b_getch(input), dest->quote); |
| 2525 | break; |
| 2526 | case '$': |
| 2527 | if (handle_dollar(dest, ctx, input)!=0) return 1; |
| 2528 | break; |
| 2529 | case '\'': |
| 2530 | dest->nonnull = 1; |
| 2531 | while(ch=b_getch(input),ch!=EOF && ch!='\'') { |
| 2532 | b_addchr(dest,ch); |
| 2533 | } |
| 2534 | if (ch==EOF) { |
| 2535 | syntax(); |
| 2536 | return 1; |
| 2537 | } |
| 2538 | break; |
| 2539 | case '"': |
| 2540 | dest->nonnull = 1; |
| 2541 | dest->quote = !dest->quote; |
| 2542 | break; |
| 2543 | case '`': |
| 2544 | process_command_subs(dest, ctx, input, '`'); |
| 2545 | break; |
| 2546 | case '>': |
| 2547 | redir_fd = redirect_opt_num(dest); |
| 2548 | done_word(dest, ctx); |
| 2549 | redir_style=REDIRECT_OVERWRITE; |
| 2550 | if (next == '>') { |
| 2551 | redir_style=REDIRECT_APPEND; |
| 2552 | b_getch(input); |
| 2553 | } else if (next == '(') { |
| 2554 | syntax(); /* until we support >(list) Process Substitution */ |
| 2555 | return 1; |
| 2556 | } |
| 2557 | setup_redirect(ctx, redir_fd, redir_style, input); |
| 2558 | break; |
| 2559 | case '<': |
| 2560 | redir_fd = redirect_opt_num(dest); |
| 2561 | done_word(dest, ctx); |
| 2562 | redir_style=REDIRECT_INPUT; |
| 2563 | if (next == '<') { |
| 2564 | redir_style=REDIRECT_HEREIS; |
| 2565 | b_getch(input); |
| 2566 | } else if (next == '>') { |
| 2567 | redir_style=REDIRECT_IO; |
| 2568 | b_getch(input); |
| 2569 | } else if (next == '(') { |
| 2570 | syntax(); /* until we support <(list) Process Substitution */ |
| 2571 | return 1; |
| 2572 | } |
| 2573 | setup_redirect(ctx, redir_fd, redir_style, input); |
| 2574 | break; |
| 2575 | case ';': |
| 2576 | done_word(dest, ctx); |
| 2577 | done_pipe(ctx,PIPE_SEQ); |
| 2578 | break; |
| 2579 | case '&': |
| 2580 | done_word(dest, ctx); |
| 2581 | if (next=='&') { |
| 2582 | b_getch(input); |
| 2583 | done_pipe(ctx,PIPE_AND); |
| 2584 | } else { |
| 2585 | done_pipe(ctx,PIPE_BG); |
| 2586 | } |
| 2587 | break; |
| 2588 | case '|': |
| 2589 | done_word(dest, ctx); |
| 2590 | if (next=='|') { |
| 2591 | b_getch(input); |
| 2592 | done_pipe(ctx,PIPE_OR); |
| 2593 | } else { |
| 2594 | /* we could pick up a file descriptor choice here |
| 2595 | * with redirect_opt_num(), but bash doesn't do it. |
| 2596 | * "echo foo 2| cat" yields "foo 2". */ |
| 2597 | done_command(ctx); |
| 2598 | } |
| 2599 | break; |
| 2600 | case '(': |
| 2601 | case '{': |
| 2602 | if (parse_group(dest, ctx, input, ch)!=0) return 1; |
| 2603 | break; |
| 2604 | case ')': |
| 2605 | case '}': |
| 2606 | syntax(); /* Proper use of this character caught by end_trigger */ |
| 2607 | return 1; |
| 2608 | break; |
| 2609 | default: |
| 2610 | syntax(); /* this is really an internal logic error */ |
| 2611 | return 1; |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 2612 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2613 | } |
| 2614 | } |
| 2615 | /* complain if quote? No, maybe we just finished a command substitution |
| 2616 | * that was quoted. Example: |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2617 | * $ echo "`cat foo` plus more" |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2618 | * and we just got the EOF generated by the subshell that ran "cat foo" |
| 2619 | * The only real complaint is if we got an EOF when end_trigger != '\0', |
| 2620 | * that is, we were really supposed to get end_trigger, and never got |
| 2621 | * one before the EOF. Can't use the standard "syntax error" return code, |
| 2622 | * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 2623 | debug_printf("leaving parse_stream (EOF)\n"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2624 | if (end_trigger != '\0') return -1; |
| 2625 | return 0; |
| 2626 | } |
| 2627 | |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 2628 | static void mapset(const unsigned char *set, int code) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2629 | { |
| 2630 | const unsigned char *s; |
| 2631 | for (s=set; *s; s++) map[*s] = code; |
| 2632 | } |
| 2633 | |
"Vladimir N. Oleynik" | 19c3701 | 2005-09-22 14:33:15 +0000 | [diff] [blame] | 2634 | static void update_ifs_map(void) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2635 | { |
| 2636 | /* char *ifs and char map[256] are both globals. */ |
| 2637 | ifs = getenv("IFS"); |
| 2638 | if (ifs == NULL) ifs=" \t\n"; |
| 2639 | /* Precompute a list of 'flow through' behavior so it can be treated |
| 2640 | * quickly up front. Computation is necessary because of IFS. |
| 2641 | * Special case handling of IFS == " \t\n" is not implemented. |
| 2642 | * The map[] array only really needs two bits each, and on most machines |
| 2643 | * that would be faster because of the reduced L1 cache footprint. |
| 2644 | */ |
Eric Andersen | aeb44c4 | 2001-05-22 20:29:00 +0000 | [diff] [blame] | 2645 | memset(map,0,sizeof(map)); /* most characters flow through always */ |
| 2646 | mapset("\\$'\"`", 3); /* never flow through */ |
| 2647 | mapset("<>;&|(){}#", 1); /* flow through if quoted */ |
| 2648 | mapset(ifs, 2); /* also flow through if quoted */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2649 | } |
| 2650 | |
Eric Andersen | aff114c | 2004-04-14 17:51:38 +0000 | [diff] [blame] | 2651 | /* most recursion does not come through here, the exception is |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2652 | * from builtin_source() */ |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2653 | int parse_stream_outer(struct in_str *inp, int flag) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2654 | { |
| 2655 | |
| 2656 | struct p_context ctx; |
| 2657 | o_string temp=NULL_O_STRING; |
| 2658 | int rcode; |
| 2659 | do { |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2660 | ctx.type = flag; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2661 | initialize_context(&ctx); |
| 2662 | update_ifs_map(); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2663 | if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset(";$&|", 0); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2664 | inp->promptmode=1; |
| 2665 | rcode = parse_stream(&temp, &ctx, inp, '\n'); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2666 | if (rcode != 1 && ctx.old_flag != 0) { |
| 2667 | syntax(); |
| 2668 | } |
| 2669 | if (rcode != 1 && ctx.old_flag == 0) { |
| 2670 | done_word(&temp, &ctx); |
| 2671 | done_pipe(&ctx,PIPE_SEQ); |
| 2672 | run_list(ctx.list_head); |
| 2673 | } else { |
| 2674 | if (ctx.old_flag != 0) { |
| 2675 | free(ctx.stack); |
| 2676 | b_reset(&temp); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2677 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2678 | temp.nonnull = 0; |
| 2679 | temp.quote = 0; |
| 2680 | inp->p = NULL; |
| 2681 | free_pipe_list(ctx.list_head,0); |
| 2682 | } |
Eric Andersen | a813afc | 2001-05-24 16:19:36 +0000 | [diff] [blame] | 2683 | b_free(&temp); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2684 | } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2685 | return 0; |
| 2686 | } |
| 2687 | |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2688 | static int parse_string_outer(const char *s, int flag) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2689 | { |
| 2690 | struct in_str input; |
| 2691 | setup_string_in_str(&input, s); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2692 | return parse_stream_outer(&input, flag); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2693 | } |
| 2694 | |
| 2695 | static int parse_file_outer(FILE *f) |
| 2696 | { |
| 2697 | int rcode; |
| 2698 | struct in_str input; |
| 2699 | setup_file_in_str(&input, f); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2700 | rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2701 | return rcode; |
| 2702 | } |
| 2703 | |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 2704 | /* Make sure we have a controlling tty. If we get started under a job |
| 2705 | * aware app (like bash for example), make sure we are now in charge so |
| 2706 | * we don't fight over who gets the foreground */ |
Eric Andersen | eaecbf3 | 2001-10-31 10:41:31 +0000 | [diff] [blame] | 2707 | static void setup_job_control(void) |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 2708 | { |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 2709 | static pid_t shell_pgrp; |
| 2710 | /* Loop until we are in the foreground. */ |
| 2711 | while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) |
| 2712 | kill (- shell_pgrp, SIGTTIN); |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 2713 | |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 2714 | /* Ignore interactive and job-control signals. */ |
| 2715 | signal(SIGINT, SIG_IGN); |
| 2716 | signal(SIGQUIT, SIG_IGN); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 2717 | signal(SIGTERM, SIG_IGN); |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 2718 | signal(SIGTSTP, SIG_IGN); |
| 2719 | signal(SIGTTIN, SIG_IGN); |
| 2720 | signal(SIGTTOU, SIG_IGN); |
Eric Andersen | 028b65b | 2001-06-28 01:10:11 +0000 | [diff] [blame] | 2721 | signal(SIGCHLD, SIG_IGN); |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 2722 | |
| 2723 | /* Put ourselves in our own process group. */ |
Eric Andersen | 5c66d06 | 2001-06-26 23:16:31 +0000 | [diff] [blame] | 2724 | setsid(); |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 2725 | shell_pgrp = getpid (); |
Eric Andersen | a90f20b | 2001-06-26 23:00:21 +0000 | [diff] [blame] | 2726 | setpgid (shell_pgrp, shell_pgrp); |
Eric Andersen | 6c947d2 | 2001-06-25 22:24:38 +0000 | [diff] [blame] | 2727 | |
| 2728 | /* Grab control of the terminal. */ |
| 2729 | tcsetpgrp(shell_terminal, shell_pgrp); |
| 2730 | } |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 2731 | |
Matt Kraai | 2d91deb | 2001-08-01 17:21:35 +0000 | [diff] [blame] | 2732 | int hush_main(int argc, char **argv) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2733 | { |
| 2734 | int opt; |
| 2735 | FILE *input; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 2736 | char **e = environ; |
Eric Andersen | bc604a2 | 2001-05-16 05:24:03 +0000 | [diff] [blame] | 2737 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2738 | /* XXX what should these be while sourcing /etc/profile? */ |
| 2739 | global_argc = argc; |
| 2740 | global_argv = argv; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2741 | |
Matt Kraai | 2d91deb | 2001-08-01 17:21:35 +0000 | [diff] [blame] | 2742 | /* (re?) initialize globals. Sometimes hush_main() ends up calling |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2743 | * hush_main(), therefore we cannot rely on the BSS to zero out this |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2744 | * stuff. Reset these to 0 every time. */ |
| 2745 | ifs = NULL; |
Eric Andersen | aeb44c4 | 2001-05-22 20:29:00 +0000 | [diff] [blame] | 2746 | /* map[] is taken care of with call to update_ifs_map() */ |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2747 | fake_mode = 0; |
| 2748 | interactive = 0; |
| 2749 | close_me_head = NULL; |
| 2750 | last_bg_pid = 0; |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 2751 | job_list = NULL; |
Eric Andersen | c798b07 | 2001-06-22 06:23:03 +0000 | [diff] [blame] | 2752 | last_jobid = 0; |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2753 | |
| 2754 | /* Initialize some more globals to non-zero values */ |
| 2755 | set_cwd(); |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 2756 | #ifdef CONFIG_FEATURE_COMMAND_EDITING |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2757 | cmdedit_set_initial_prompt(); |
| 2758 | #else |
| 2759 | PS1 = NULL; |
| 2760 | #endif |
| 2761 | PS2 = "> "; |
| 2762 | |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2763 | /* initialize our shell local variables with the values |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2764 | * currently living in the environment */ |
| 2765 | if (e) { |
| 2766 | for (; *e; e++) |
| 2767 | set_local_var(*e, 2); /* without call putenv() */ |
| 2768 | } |
| 2769 | |
| 2770 | last_return_code=EXIT_SUCCESS; |
| 2771 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2772 | |
| 2773 | if (argv[0] && argv[0][0] == '-') { |
| 2774 | debug_printf("\nsourcing /etc/profile\n"); |
Eric Andersen | a90f20b | 2001-06-26 23:00:21 +0000 | [diff] [blame] | 2775 | if ((input = fopen("/etc/profile", "r")) != NULL) { |
| 2776 | mark_open(fileno(input)); |
| 2777 | parse_file_outer(input); |
| 2778 | mark_closed(fileno(input)); |
| 2779 | fclose(input); |
| 2780 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2781 | } |
| 2782 | input=stdin; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2783 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2784 | while ((opt = getopt(argc, argv, "c:xif")) > 0) { |
| 2785 | switch (opt) { |
| 2786 | case 'c': |
| 2787 | { |
| 2788 | global_argv = argv+optind; |
| 2789 | global_argc = argc-optind; |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2790 | opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 2791 | goto final_return; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2792 | } |
| 2793 | break; |
| 2794 | case 'i': |
| 2795 | interactive++; |
| 2796 | break; |
| 2797 | case 'f': |
| 2798 | fake_mode++; |
| 2799 | break; |
| 2800 | default: |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 2801 | #ifndef BB_VER |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2802 | fprintf(stderr, "Usage: sh [FILE]...\n" |
| 2803 | " or: sh -c command [args]...\n\n"); |
| 2804 | exit(EXIT_FAILURE); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 2805 | #else |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 2806 | bb_show_usage(); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 2807 | #endif |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2808 | } |
| 2809 | } |
| 2810 | /* A shell is interactive if the `-i' flag was given, or if all of |
| 2811 | * the following conditions are met: |
| 2812 | * no -c command |
| 2813 | * no arguments remaining or the -s flag given |
| 2814 | * standard input is a terminal |
| 2815 | * standard output is a terminal |
| 2816 | * Refer to Posix.2, the description of the `sh' utility. */ |
| 2817 | if (argv[optind]==NULL && input==stdin && |
Eric Andersen | 70060d2 | 2004-03-27 10:02:48 +0000 | [diff] [blame] | 2818 | isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2819 | interactive++; |
| 2820 | } |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 2821 | |
| 2822 | debug_printf("\ninteractive=%d\n", interactive); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2823 | if (interactive) { |
| 2824 | /* Looks like they want an interactive shell */ |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2825 | #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET |
Eric Andersen | d63dee4 | 2001-10-19 00:22:23 +0000 | [diff] [blame] | 2826 | printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); |
| 2827 | printf( "Enter 'help' for a list of built-in commands.\n\n"); |
| 2828 | #endif |
Eric Andersen | 52a97ca | 2001-06-22 06:49:26 +0000 | [diff] [blame] | 2829 | setup_job_control(); |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 2830 | } |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2831 | |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 2832 | if (argv[optind]==NULL) { |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 2833 | opt=parse_file_outer(stdin); |
| 2834 | goto final_return; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2835 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2836 | |
| 2837 | debug_printf("\nrunning script '%s'\n", argv[optind]); |
| 2838 | global_argv = argv+optind; |
| 2839 | global_argc = argc-optind; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 2840 | input = bb_xfopen(argv[optind], "r"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2841 | opt = parse_file_outer(input); |
| 2842 | |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 2843 | #ifdef CONFIG_FEATURE_CLEAN_UP |
Eric Andersen | aeb44c4 | 2001-05-22 20:29:00 +0000 | [diff] [blame] | 2844 | fclose(input); |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 2845 | if (cwd && cwd != bb_msg_unknown) |
Eric Andersen | aeb44c4 | 2001-05-22 20:29:00 +0000 | [diff] [blame] | 2846 | free((char*)cwd); |
| 2847 | { |
| 2848 | struct variables *cur, *tmp; |
| 2849 | for(cur = top_vars; cur; cur = tmp) { |
| 2850 | tmp = cur->next; |
| 2851 | if (!cur->flg_read_only) { |
| 2852 | free(cur->name); |
| 2853 | free(cur->value); |
| 2854 | free(cur); |
| 2855 | } |
| 2856 | } |
| 2857 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2858 | #endif |
| 2859 | |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 2860 | final_return: |
| 2861 | return(opt?opt:last_return_code); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2862 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2863 | |
| 2864 | static char *insert_var_value(char *inp) |
| 2865 | { |
| 2866 | int res_str_len = 0; |
| 2867 | int len; |
| 2868 | int done = 0; |
| 2869 | char *p, *p1, *res_str = NULL; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2870 | |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2871 | while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { |
| 2872 | if (p != inp) { |
| 2873 | len = p - inp; |
| 2874 | res_str = xrealloc(res_str, (res_str_len + len)); |
| 2875 | strncpy((res_str + res_str_len), inp, len); |
| 2876 | res_str_len += len; |
| 2877 | } |
| 2878 | inp = ++p; |
| 2879 | p = strchr(inp, SPECIAL_VAR_SYMBOL); |
| 2880 | *p = '\0'; |
| 2881 | if ((p1 = lookup_param(inp))) { |
| 2882 | len = res_str_len + strlen(p1); |
| 2883 | res_str = xrealloc(res_str, (1 + len)); |
| 2884 | strcpy((res_str + res_str_len), p1); |
| 2885 | res_str_len = len; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2886 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2887 | *p = SPECIAL_VAR_SYMBOL; |
| 2888 | inp = ++p; |
| 2889 | done = 1; |
| 2890 | } |
| 2891 | if (done) { |
| 2892 | res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); |
| 2893 | strcpy((res_str + res_str_len), inp); |
| 2894 | while ((p = strchr(res_str, '\n'))) { |
| 2895 | *p = ' '; |
| 2896 | } |
| 2897 | } |
| 2898 | return (res_str == NULL) ? inp : res_str; |
| 2899 | } |
| 2900 | |
| 2901 | static char **make_list_in(char **inp, char *name) |
| 2902 | { |
| 2903 | int len, i; |
| 2904 | int name_len = strlen(name); |
| 2905 | int n = 0; |
| 2906 | char **list; |
| 2907 | char *p1, *p2, *p3; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2908 | |
| 2909 | /* create list of variable values */ |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2910 | list = xmalloc(sizeof(*list)); |
| 2911 | for (i = 0; inp[i]; i++) { |
| 2912 | p3 = insert_var_value(inp[i]); |
| 2913 | p1 = p3; |
| 2914 | while (*p1) { |
| 2915 | if ((*p1 == ' ')) { |
| 2916 | p1++; |
| 2917 | continue; |
| 2918 | } |
| 2919 | if ((p2 = strchr(p1, ' '))) { |
| 2920 | len = p2 - p1; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2921 | } else { |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2922 | len = strlen(p1); |
| 2923 | p2 = p1 + len; |
| 2924 | } |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2925 | /* we use n + 2 in realloc for list,because we add |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2926 | * new element and then we will add NULL element */ |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2927 | list = xrealloc(list, sizeof(*list) * (n + 2)); |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2928 | list[n] = xmalloc(2 + name_len + len); |
| 2929 | strcpy(list[n], name); |
| 2930 | strcat(list[n], "="); |
| 2931 | strncat(list[n], p1, len); |
| 2932 | list[n++][name_len + len + 1] = '\0'; |
| 2933 | p1 = p2; |
| 2934 | } |
| 2935 | if (p3 != inp[i]) free(p3); |
| 2936 | } |
| 2937 | list[n] = NULL; |
| 2938 | return list; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 2939 | } |
Eric Andersen | 4c9b68f | 2002-04-13 12:33:41 +0000 | [diff] [blame] | 2940 | |
| 2941 | /* Make new string for parser */ |
| 2942 | static char * make_string(char ** inp) |
| 2943 | { |
| 2944 | char *p; |
| 2945 | char *str = NULL; |
| 2946 | int n; |
| 2947 | int len = 2; |
| 2948 | |
| 2949 | for (n = 0; inp[n]; n++) { |
| 2950 | p = insert_var_value(inp[n]); |
| 2951 | str = xrealloc(str, (len + strlen(p))); |
| 2952 | if (n) { |
| 2953 | strcat(str, " "); |
| 2954 | } else { |
| 2955 | *str = '\0'; |
| 2956 | } |
| 2957 | strcat(str, p); |
| 2958 | len = strlen(str) + 3; |
| 2959 | if (p != inp[n]) free(p); |
| 2960 | } |
| 2961 | len = strlen(str); |
| 2962 | *(str + len) = '\n'; |
| 2963 | *(str + len + 1) = '\0'; |
| 2964 | return str; |
| 2965 | } |