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 |
| 12 | * written Dec 2000 and Jan 2001 by Larry Doolittle. |
| 13 | * The execution engine, the builtins, and much of the underlying |
| 14 | * support has been adapted from busybox-0.49pre's lash, |
| 15 | * which is Copyright (C) 2000 by Lineo, Inc., and |
| 16 | * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>. |
| 17 | * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and |
| 18 | * Erik W. Troan, which they placed in the public domain. I don't know |
| 19 | * how much of the Johnson/Troan code has survived the repeated rewrites. |
| 20 | * Other credits: |
| 21 | * simple_itoa() was lifted from boa-0.93.15 |
| 22 | * b_addchr() derived from similar w_addchar function in glibc-2.2 |
| 23 | * setup_redirect(), redirect_opt_num(), and big chunks of main() |
| 24 | * and many builtins derived from contributions by Erik Andersen |
| 25 | * miscellaneous bugfixes from Matt Kraai |
| 26 | * |
| 27 | * There are two big (and related) architecture differences between |
| 28 | * this parser and the lash parser. One is that this version is |
| 29 | * actually designed from the ground up to understand nearly all |
| 30 | * of the Bourne grammar. The second, consequential change is that |
| 31 | * the parser and input reader have been turned inside out. Now, |
| 32 | * the parser is in control, and asks for input as needed. The old |
| 33 | * way had the input reader in control, and it asked for parsing to |
| 34 | * take place as needed. The new way makes it much easier to properly |
| 35 | * handle the recursion implicit in the various substitutions, especially |
| 36 | * across continuation lines. |
| 37 | * |
| 38 | * Bash grammar not implemented: (how many of these were in original sh?) |
| 39 | * $@ (those sure look like weird quoting rules) |
| 40 | * $_ |
| 41 | * ! negation operator for pipes |
| 42 | * &> and >& redirection of stdout+stderr |
| 43 | * Brace Expansion |
| 44 | * Tilde Expansion |
| 45 | * fancy forms of Parameter Expansion |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 46 | * aliases |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 47 | * Arithmetic Expansion |
| 48 | * <(list) and >(list) Process Substitution |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 49 | * reserved words: case, esac, select, function |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 50 | * Here Documents ( << word ) |
| 51 | * Functions |
| 52 | * Major bugs: |
| 53 | * job handling woefully incomplete and buggy |
| 54 | * reserved word execution woefully incomplete and buggy |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 55 | * to-do: |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 56 | * port selected bugfixes from post-0.49 busybox lash - done? |
| 57 | * finish implementing reserved words: for, while, until, do, done |
| 58 | * change { and } from special chars to reserved words |
| 59 | * builtins: break, continue, eval, return, set, trap, ulimit |
| 60 | * test magic exec |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 61 | * handle children going into background |
| 62 | * clean up recognition of null pipes |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 63 | * check setting of global_argc and global_argv |
| 64 | * control-C handling, probably with longjmp |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 65 | * follow IFS rules more precisely, including update semantics |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 66 | * figure out what to do with backslash-newline |
| 67 | * explain why we use signal instead of sigaction |
| 68 | * propagate syntax errors, die on resource errors? |
| 69 | * continuation lines, both explicit and implicit - done? |
| 70 | * memory leak finding and plugging - done? |
| 71 | * more testing, especially quoting rules and redirection |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 72 | * document how quoting rules not precisely followed for variable assignments |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 73 | * maybe change map[] to use 2-bit entries |
| 74 | * (eventually) remove all the printf's |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 75 | * |
| 76 | * This program is free software; you can redistribute it and/or modify |
| 77 | * it under the terms of the GNU General Public License as published by |
| 78 | * the Free Software Foundation; either version 2 of the License, or |
| 79 | * (at your option) any later version. |
| 80 | * |
| 81 | * This program is distributed in the hope that it will be useful, |
| 82 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 83 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 84 | * General Public License for more details. |
| 85 | * |
| 86 | * You should have received a copy of the GNU General Public License |
| 87 | * along with this program; if not, write to the Free Software |
| 88 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 89 | */ |
| 90 | #include <ctype.h> /* isalpha, isdigit */ |
| 91 | #include <unistd.h> /* getpid */ |
| 92 | #include <stdlib.h> /* getenv, atoi */ |
| 93 | #include <string.h> /* strchr */ |
| 94 | #include <stdio.h> /* popen etc. */ |
| 95 | #include <glob.h> /* glob, of course */ |
| 96 | #include <stdarg.h> /* va_list */ |
| 97 | #include <errno.h> |
| 98 | #include <fcntl.h> |
| 99 | #include <getopt.h> /* should be pretty obvious */ |
| 100 | |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 101 | #include <sys/stat.h> /* ulimit */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 102 | #include <sys/types.h> |
| 103 | #include <sys/wait.h> |
| 104 | #include <signal.h> |
| 105 | |
| 106 | /* #include <dmalloc.h> */ |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 107 | /* #define DEBUG_SHELL */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 108 | |
| 109 | #ifdef BB_VER |
| 110 | #include "busybox.h" |
| 111 | #include "cmdedit.h" |
| 112 | #else |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 113 | #define applet_name "hush" |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 114 | #include "standalone.h" |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 115 | #define shell_main main |
Eric Andersen | 004015e | 2001-05-21 20:30:51 +0000 | [diff] [blame] | 116 | #undef BB_FEATURE_SH_FANCY_PROMPT |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 117 | #endif |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 118 | |
| 119 | typedef enum { |
| 120 | REDIRECT_INPUT = 1, |
| 121 | REDIRECT_OVERWRITE = 2, |
| 122 | REDIRECT_APPEND = 3, |
| 123 | REDIRECT_HEREIS = 4, |
| 124 | REDIRECT_IO = 5 |
| 125 | } redir_type; |
| 126 | |
| 127 | /* The descrip member of this structure is only used to make debugging |
| 128 | * output pretty */ |
| 129 | struct {int mode; int default_fd; char *descrip;} redir_table[] = { |
| 130 | { 0, 0, "()" }, |
| 131 | { O_RDONLY, 0, "<" }, |
| 132 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, |
| 133 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, |
| 134 | { O_RDONLY, -1, "<<" }, |
| 135 | { O_RDWR, 1, "<>" } |
| 136 | }; |
| 137 | |
| 138 | typedef enum { |
| 139 | PIPE_SEQ = 1, |
| 140 | PIPE_AND = 2, |
| 141 | PIPE_OR = 3, |
| 142 | PIPE_BG = 4, |
| 143 | } pipe_style; |
| 144 | |
| 145 | /* might eventually control execution */ |
| 146 | typedef enum { |
| 147 | RES_NONE = 0, |
| 148 | RES_IF = 1, |
| 149 | RES_THEN = 2, |
| 150 | RES_ELIF = 3, |
| 151 | RES_ELSE = 4, |
| 152 | RES_FI = 5, |
| 153 | RES_FOR = 6, |
| 154 | RES_WHILE = 7, |
| 155 | RES_UNTIL = 8, |
| 156 | RES_DO = 9, |
| 157 | RES_DONE = 10, |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 158 | RES_XXXX = 11, |
| 159 | RES_SNTX = 12 |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 160 | } reserved_style; |
| 161 | #define FLAG_END (1<<RES_NONE) |
| 162 | #define FLAG_IF (1<<RES_IF) |
| 163 | #define FLAG_THEN (1<<RES_THEN) |
| 164 | #define FLAG_ELIF (1<<RES_ELIF) |
| 165 | #define FLAG_ELSE (1<<RES_ELSE) |
| 166 | #define FLAG_FI (1<<RES_FI) |
| 167 | #define FLAG_FOR (1<<RES_FOR) |
| 168 | #define FLAG_WHILE (1<<RES_WHILE) |
| 169 | #define FLAG_UNTIL (1<<RES_UNTIL) |
| 170 | #define FLAG_DO (1<<RES_DO) |
| 171 | #define FLAG_DONE (1<<RES_DONE) |
| 172 | #define FLAG_START (1<<RES_XXXX) |
| 173 | |
| 174 | /* This holds pointers to the various results of parsing */ |
| 175 | struct p_context { |
| 176 | struct child_prog *child; |
| 177 | struct pipe *list_head; |
| 178 | struct pipe *pipe; |
| 179 | struct redir_struct *pending_redirect; |
| 180 | reserved_style w; |
| 181 | int old_flag; /* for figuring out valid reserved words */ |
| 182 | struct p_context *stack; |
| 183 | /* How about quoting status? */ |
| 184 | }; |
| 185 | |
| 186 | struct redir_struct { |
| 187 | redir_type type; /* type of redirection */ |
| 188 | int fd; /* file descriptor being redirected */ |
| 189 | int dup; /* -1, or file descriptor being duplicated */ |
| 190 | struct redir_struct *next; /* pointer to the next redirect in the list */ |
| 191 | glob_t word; /* *word.gl_pathv is the filename */ |
| 192 | }; |
| 193 | |
| 194 | struct child_prog { |
| 195 | pid_t pid; /* 0 if exited */ |
| 196 | char **argv; /* program name and arguments */ |
| 197 | struct pipe *group; /* if non-NULL, first in group or subshell */ |
| 198 | int subshell; /* flag, non-zero if group must be forked */ |
| 199 | struct redir_struct *redirects; /* I/O redirections */ |
| 200 | glob_t glob_result; /* result of parameter globbing */ |
| 201 | int is_stopped; /* is the program currently running? */ |
| 202 | struct pipe *family; /* pointer back to the child's parent pipe */ |
| 203 | }; |
| 204 | |
| 205 | struct pipe { |
| 206 | int jobid; /* job number */ |
| 207 | int num_progs; /* total number of programs in job */ |
| 208 | int running_progs; /* number of programs running */ |
| 209 | char *text; /* name of job */ |
| 210 | char *cmdbuf; /* buffer various argv's point into */ |
| 211 | pid_t pgrp; /* process group ID for the job */ |
| 212 | struct child_prog *progs; /* array of commands in pipe */ |
| 213 | struct pipe *next; /* to track background commands */ |
| 214 | int stopped_progs; /* number of programs alive, but stopped */ |
| 215 | int job_context; /* bitmask defining current context */ |
| 216 | pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ |
| 217 | reserved_style r_mode; /* supports if, for, while, until */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 218 | }; |
| 219 | |
| 220 | struct jobset { |
| 221 | struct pipe *head; /* head of list of running jobs */ |
| 222 | struct pipe *fg; /* current foreground job */ |
| 223 | }; |
| 224 | |
| 225 | struct close_me { |
| 226 | int fd; |
| 227 | struct close_me *next; |
| 228 | }; |
| 229 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 230 | struct variables { |
| 231 | char *name; |
| 232 | char *value; |
| 233 | int flg_export; |
| 234 | int flg_read_only; |
| 235 | struct variables *next; |
| 236 | }; |
| 237 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 238 | /* globals, connect us to the outside world |
| 239 | * the first three support $?, $#, and $1 */ |
| 240 | char **global_argv; |
| 241 | unsigned int global_argc; |
| 242 | unsigned int last_return_code; |
| 243 | extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */ |
| 244 | |
| 245 | /* Variables we export */ |
| 246 | unsigned int shell_context; /* Used in cmdedit.c to reset the |
| 247 | * context when someone hits ^C */ |
| 248 | |
| 249 | /* "globals" within this file */ |
Eric Andersen | bc604a2 | 2001-05-16 05:24:03 +0000 | [diff] [blame] | 250 | static char *ifs; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 251 | static char map[256]; |
Eric Andersen | bc604a2 | 2001-05-16 05:24:03 +0000 | [diff] [blame] | 252 | static int fake_mode; |
| 253 | static int interactive; |
| 254 | static struct close_me *close_me_head; |
Eric Andersen | cfa88ec | 2001-05-11 18:08:16 +0000 | [diff] [blame] | 255 | static const char *cwd; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 256 | static struct jobset *job_list; |
Eric Andersen | bc604a2 | 2001-05-16 05:24:03 +0000 | [diff] [blame] | 257 | static unsigned int last_bg_pid; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 258 | static char *PS1; |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 259 | static char *PS2; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 260 | struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 261 | struct variables *top_vars = &shell_ver; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 262 | |
| 263 | #define B_CHUNK (100) |
| 264 | #define B_NOSPAC 1 |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 265 | |
| 266 | typedef struct { |
| 267 | char *data; |
| 268 | int length; |
| 269 | int maxlen; |
| 270 | int quote; |
| 271 | int nonnull; |
| 272 | } o_string; |
| 273 | #define NULL_O_STRING {NULL,0,0,0,0} |
| 274 | /* used for initialization: |
| 275 | o_string foo = NULL_O_STRING; */ |
| 276 | |
| 277 | /* I can almost use ordinary FILE *. Is open_memstream() universally |
| 278 | * available? Where is it documented? */ |
| 279 | struct in_str { |
| 280 | const char *p; |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 281 | char peek_buf[2]; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 282 | int __promptme; |
| 283 | int promptmode; |
| 284 | FILE *file; |
| 285 | int (*get) (struct in_str *); |
| 286 | int (*peek) (struct in_str *); |
| 287 | }; |
| 288 | #define b_getch(input) ((input)->get(input)) |
| 289 | #define b_peek(input) ((input)->peek(input)) |
| 290 | |
| 291 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" |
| 292 | |
| 293 | struct built_in_command { |
| 294 | char *cmd; /* name */ |
| 295 | char *descr; /* description */ |
| 296 | int (*function) (struct child_prog *); /* function ptr */ |
| 297 | }; |
| 298 | |
| 299 | /* belongs in busybox.h */ |
| 300 | static inline int max(int a, int b) { |
| 301 | return (a>b)?a:b; |
| 302 | } |
| 303 | |
| 304 | /* This should be in utility.c */ |
| 305 | #ifdef DEBUG_SHELL |
| 306 | static void debug_printf(const char *format, ...) |
| 307 | { |
| 308 | va_list args; |
| 309 | va_start(args, format); |
| 310 | vfprintf(stderr, format, args); |
| 311 | va_end(args); |
| 312 | } |
| 313 | #else |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 314 | static inline void debug_printf(const char *format, ...) { } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 315 | #endif |
| 316 | #define final_printf debug_printf |
| 317 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 318 | static void __syntax(char *file, int line) { |
| 319 | error_msg("syntax error %s:%d", file, line); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 320 | } |
| 321 | #define syntax() __syntax(__FILE__, __LINE__) |
| 322 | |
| 323 | /* Index of subroutines: */ |
| 324 | /* function prototypes for builtins */ |
| 325 | static int builtin_cd(struct child_prog *child); |
| 326 | static int builtin_env(struct child_prog *child); |
| 327 | static int builtin_exec(struct child_prog *child); |
| 328 | static int builtin_exit(struct child_prog *child); |
| 329 | static int builtin_export(struct child_prog *child); |
| 330 | static int builtin_fg_bg(struct child_prog *child); |
| 331 | static int builtin_help(struct child_prog *child); |
| 332 | static int builtin_jobs(struct child_prog *child); |
| 333 | static int builtin_pwd(struct child_prog *child); |
| 334 | static int builtin_read(struct child_prog *child); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 335 | static int builtin_set(struct child_prog *child); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 336 | static int builtin_shift(struct child_prog *child); |
| 337 | static int builtin_source(struct child_prog *child); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 338 | static int builtin_umask(struct child_prog *child); |
| 339 | static int builtin_unset(struct child_prog *child); |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 340 | static int builtin_not_written(struct child_prog *child); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 341 | /* o_string manipulation: */ |
| 342 | static int b_check_space(o_string *o, int len); |
| 343 | static int b_addchr(o_string *o, int ch); |
| 344 | static void b_reset(o_string *o); |
| 345 | static int b_addqchr(o_string *o, int ch, int quote); |
| 346 | static int b_adduint(o_string *o, unsigned int i); |
| 347 | /* in_str manipulations: */ |
| 348 | static int static_get(struct in_str *i); |
| 349 | static int static_peek(struct in_str *i); |
| 350 | static int file_get(struct in_str *i); |
| 351 | static int file_peek(struct in_str *i); |
| 352 | static void setup_file_in_str(struct in_str *i, FILE *f); |
| 353 | static void setup_string_in_str(struct in_str *i, const char *s); |
| 354 | /* close_me manipulations: */ |
| 355 | static void mark_open(int fd); |
| 356 | static void mark_closed(int fd); |
| 357 | static void close_all(); |
| 358 | /* "run" the final data structures: */ |
| 359 | static char *indenter(int i); |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 360 | static int free_pipe_list(struct pipe *head, int indent); |
| 361 | static int free_pipe(struct pipe *pi, int indent); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 362 | /* really run the final data structures: */ |
| 363 | static int setup_redirects(struct child_prog *prog, int squirrel[]); |
| 364 | static int pipe_wait(struct pipe *pi); |
| 365 | static int run_list_real(struct pipe *pi); |
| 366 | static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 367 | int controlling_tty(int check_pgrp); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 368 | static int run_pipe_real(struct pipe *pi); |
| 369 | /* extended glob support: */ |
| 370 | static int globhack(const char *src, int flags, glob_t *pglob); |
| 371 | static int glob_needed(const char *s); |
| 372 | static int xglob(o_string *dest, int flags, glob_t *pglob); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 373 | /* variable assignment: */ |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 374 | static int is_assignment(const char *s); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 375 | /* data structure manipulation: */ |
| 376 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); |
| 377 | static void initialize_context(struct p_context *ctx); |
| 378 | static int done_word(o_string *dest, struct p_context *ctx); |
| 379 | static int done_command(struct p_context *ctx); |
| 380 | static int done_pipe(struct p_context *ctx, pipe_style type); |
| 381 | /* primary string parsing: */ |
| 382 | static int redirect_dup_num(struct in_str *input); |
| 383 | static int redirect_opt_num(o_string *o); |
| 384 | static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); |
| 385 | static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); |
| 386 | static void lookup_param(o_string *dest, struct p_context *ctx, o_string *src); |
| 387 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); |
| 388 | static int parse_string(o_string *dest, struct p_context *ctx, const char *src); |
| 389 | static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); |
| 390 | /* setup: */ |
| 391 | static int parse_stream_outer(struct in_str *inp); |
| 392 | static int parse_string_outer(const char *s); |
| 393 | static int parse_file_outer(FILE *f); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 394 | /* job management: */ |
| 395 | static void checkjobs(); |
| 396 | static void insert_bg_job(struct pipe *pi); |
| 397 | static void remove_bg_job(struct pipe *pi); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 398 | /* local variable support */ |
| 399 | static char *get_local_var(const char *var); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 400 | static void unset_local_var(const char *name); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 401 | static int set_local_var(const char *s, int flg_export); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 402 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 403 | |
| 404 | /* Table of built-in functions. They can be forked or not, depending on |
| 405 | * context: within pipes, they fork. As simple commands, they do not. |
| 406 | * When used in non-forking context, they can change global variables |
| 407 | * in the parent shell process. If forked, of course they can not. |
| 408 | * For example, 'unset foo | whatever' will parse and run, but foo will |
| 409 | * still be set at the end. */ |
| 410 | static struct built_in_command bltins[] = { |
| 411 | {"bg", "Resume a job in the background", builtin_fg_bg}, |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 412 | {"break", "Exit for, while or until loop", builtin_not_written}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 413 | {"cd", "Change working directory", builtin_cd}, |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 414 | {"continue", "Continue for, while or until loop", builtin_not_written}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 415 | {"env", "Print all environment variables", builtin_env}, |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 416 | {"eval", "Construct and run shell command", builtin_not_written}, |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 417 | {"exec", "Exec command, replacing this shell with the exec'd process", |
| 418 | builtin_exec}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 419 | {"exit", "Exit from shell()", builtin_exit}, |
| 420 | {"export", "Set environment variable", builtin_export}, |
| 421 | {"fg", "Bring job into the foreground", builtin_fg_bg}, |
| 422 | {"jobs", "Lists the active jobs", builtin_jobs}, |
| 423 | {"pwd", "Print current directory", builtin_pwd}, |
| 424 | {"read", "Input environment variable", builtin_read}, |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 425 | {"return", "Return from a function", builtin_not_written}, |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 426 | {"set", "Set/unset shell local variables", builtin_set}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 427 | {"shift", "Shift positional parameters", builtin_shift}, |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 428 | {"trap", "Trap signals", builtin_not_written}, |
| 429 | {"ulimit","Controls resource limits", builtin_not_written}, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 430 | {"umask","Sets file creation mask", builtin_umask}, |
| 431 | {"unset", "Unset environment variable", builtin_unset}, |
| 432 | {".", "Source-in and run commands in a file", builtin_source}, |
| 433 | {"help", "List shell built-in commands", builtin_help}, |
| 434 | {NULL, NULL, NULL} |
| 435 | }; |
| 436 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 437 | static const char *set_cwd(void) |
| 438 | { |
| 439 | if(cwd==unknown) |
| 440 | cwd = NULL; /* xgetcwd(arg) called free(arg) */ |
| 441 | cwd = xgetcwd((char *)cwd); |
| 442 | if (!cwd) |
| 443 | cwd = unknown; |
| 444 | return cwd; |
| 445 | } |
| 446 | |
| 447 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 448 | /* built-in 'cd <path>' handler */ |
| 449 | static int builtin_cd(struct child_prog *child) |
| 450 | { |
| 451 | char *newdir; |
| 452 | if (child->argv[1] == NULL) |
| 453 | newdir = getenv("HOME"); |
| 454 | else |
| 455 | newdir = child->argv[1]; |
| 456 | if (chdir(newdir)) { |
| 457 | printf("cd: %s: %s\n", newdir, strerror(errno)); |
| 458 | return EXIT_FAILURE; |
| 459 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 460 | set_cwd(); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 461 | return EXIT_SUCCESS; |
| 462 | } |
| 463 | |
| 464 | /* built-in 'env' handler */ |
| 465 | static int builtin_env(struct child_prog *dummy) |
| 466 | { |
| 467 | char **e = environ; |
| 468 | if (e == NULL) return EXIT_FAILURE; |
| 469 | for (; *e; e++) { |
| 470 | puts(*e); |
| 471 | } |
| 472 | return EXIT_SUCCESS; |
| 473 | } |
| 474 | |
| 475 | /* built-in 'exec' handler */ |
| 476 | static int builtin_exec(struct child_prog *child) |
| 477 | { |
| 478 | if (child->argv[1] == NULL) |
| 479 | return EXIT_SUCCESS; /* Really? */ |
| 480 | child->argv++; |
| 481 | pseudo_exec(child); |
| 482 | /* never returns */ |
| 483 | } |
| 484 | |
| 485 | /* built-in 'exit' handler */ |
| 486 | static int builtin_exit(struct child_prog *child) |
| 487 | { |
| 488 | if (child->argv[1] == NULL) |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 489 | exit(last_return_code); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 490 | exit (atoi(child->argv[1])); |
| 491 | } |
| 492 | |
| 493 | /* built-in 'export VAR=value' handler */ |
| 494 | static int builtin_export(struct child_prog *child) |
| 495 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 496 | int res = 0; |
| 497 | char *name = child->argv[1]; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 498 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 499 | if (name == NULL) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 500 | return (builtin_env(child)); |
| 501 | } |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 502 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 503 | name = strdup(name); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 504 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 505 | if(name) { |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 506 | char *value = strchr(name, '='); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 507 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 508 | if (!value) { |
| 509 | char *tmp; |
| 510 | /* They are exporting something without an =VALUE */ |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 511 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 512 | value = get_local_var(name); |
| 513 | if (value) { |
| 514 | size_t ln = strlen(name); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 515 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 516 | tmp = realloc(name, ln+strlen(value)+2); |
| 517 | if(tmp==NULL) |
| 518 | res = -1; |
| 519 | else { |
| 520 | sprintf(tmp+ln, "=%s", value); |
| 521 | name = tmp; |
| 522 | } |
| 523 | } else { |
| 524 | /* bash does not return an error when trying to export |
| 525 | * an undefined variable. Do likewise. */ |
| 526 | res = 1; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 527 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 528 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 529 | } |
| 530 | if (res<0) |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 531 | perror_msg("export"); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 532 | else if(res==0) |
| 533 | res = set_local_var(name, 1); |
| 534 | else |
| 535 | res = 0; |
| 536 | free(name); |
| 537 | return res; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | /* built-in 'fg' and 'bg' handler */ |
| 541 | static int builtin_fg_bg(struct child_prog *child) |
| 542 | { |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 543 | int i, jobnum; |
| 544 | struct pipe *pi=NULL; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 545 | |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 546 | /* If they gave us no args, assume they want the last backgrounded task */ |
| 547 | if (!child->argv[1]) { |
| 548 | for (pi = job_list->head; pi; pi = pi->next) { |
| 549 | if (pi->progs && pi->progs->pid == last_bg_pid) { |
| 550 | break; |
| 551 | } |
| 552 | } |
| 553 | if (!pi) { |
| 554 | error_msg("%s: no current job", child->argv[0]); |
| 555 | return EXIT_FAILURE; |
| 556 | } |
| 557 | } else { |
| 558 | if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { |
| 559 | error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); |
| 560 | return EXIT_FAILURE; |
| 561 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 562 | |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 563 | for (pi = job_list->head; pi; pi = pi->next) { |
| 564 | if (pi->jobid == jobnum) { |
| 565 | break; |
| 566 | } |
| 567 | } |
| 568 | if (!pi) { |
| 569 | error_msg("%s: %d: no such job", child->argv[0], jobnum); |
| 570 | return EXIT_FAILURE; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 571 | } |
| 572 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 573 | if (*child->argv[0] == 'f') { |
| 574 | /* Make this job the foreground job */ |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 575 | signal(SIGTTOU, SIG_IGN); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 576 | /* suppress messages when run from /linuxrc mag@sysgo.de */ |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 577 | if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY) |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 578 | perror_msg("tcsetpgrp-1"); |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 579 | signal(SIGTTOU, SIG_DFL); |
| 580 | job_list->fg = pi; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 581 | } |
| 582 | |
| 583 | /* Restart the processes in the job */ |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 584 | for (i = 0; i < pi->num_progs; i++) |
| 585 | pi->progs[i].is_stopped = 0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 586 | |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 587 | kill(-pi->pgrp, SIGCONT); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 588 | |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 589 | pi->stopped_progs = 0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 590 | return EXIT_SUCCESS; |
| 591 | } |
| 592 | |
| 593 | /* built-in 'help' handler */ |
| 594 | static int builtin_help(struct child_prog *dummy) |
| 595 | { |
| 596 | struct built_in_command *x; |
| 597 | |
| 598 | printf("\nBuilt-in commands:\n"); |
| 599 | printf("-------------------\n"); |
| 600 | for (x = bltins; x->cmd; x++) { |
| 601 | if (x->descr==NULL) |
| 602 | continue; |
| 603 | printf("%s\t%s\n", x->cmd, x->descr); |
| 604 | } |
| 605 | printf("\n\n"); |
| 606 | return EXIT_SUCCESS; |
| 607 | } |
| 608 | |
| 609 | /* built-in 'jobs' handler */ |
| 610 | static int builtin_jobs(struct child_prog *child) |
| 611 | { |
| 612 | struct pipe *job; |
| 613 | char *status_string; |
| 614 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 615 | for (job = job_list->head; job; job = job->next) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 616 | if (job->running_progs == job->stopped_progs) |
| 617 | status_string = "Stopped"; |
| 618 | else |
| 619 | status_string = "Running"; |
| 620 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); |
| 621 | } |
| 622 | return EXIT_SUCCESS; |
| 623 | } |
| 624 | |
| 625 | |
| 626 | /* built-in 'pwd' handler */ |
| 627 | static int builtin_pwd(struct child_prog *dummy) |
| 628 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 629 | puts(set_cwd()); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 630 | return EXIT_SUCCESS; |
| 631 | } |
| 632 | |
| 633 | /* built-in 'read VAR' handler */ |
| 634 | static int builtin_read(struct child_prog *child) |
| 635 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 636 | int res; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 637 | |
| 638 | if (child->argv[1]) { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 639 | char string[BUFSIZ]; |
| 640 | char *var = 0; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 641 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 642 | string[0] = 0; /* In case stdin has only EOF */ |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 643 | /* read string */ |
| 644 | fgets(string, sizeof(string), stdin); |
| 645 | chomp(string); |
| 646 | var = malloc(strlen(child->argv[1])+strlen(string)+2); |
| 647 | if(var) { |
| 648 | sprintf(var, "%s=%s", child->argv[1], string); |
| 649 | res = set_local_var(var, 0); |
| 650 | } else |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 651 | res = -1; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 652 | if (res) |
| 653 | fprintf(stderr, "read: %m\n"); |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 654 | free(var); /* So not move up to avoid breaking errno */ |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 655 | return res; |
| 656 | } else { |
| 657 | do res=getchar(); while(res!='\n' && res!=EOF); |
| 658 | return 0; |
| 659 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 660 | } |
| 661 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 662 | /* built-in 'set VAR=value' handler */ |
| 663 | static int builtin_set(struct child_prog *child) |
| 664 | { |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 665 | char *temp = child->argv[1]; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 666 | struct variables *e; |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 667 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 668 | if (temp == NULL) |
| 669 | for(e = top_vars; e; e=e->next) |
| 670 | printf("%s=%s\n", e->name, e->value); |
| 671 | else |
| 672 | set_local_var(temp, 0); |
| 673 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 674 | return EXIT_SUCCESS; |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 675 | } |
| 676 | |
| 677 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 678 | /* Built-in 'shift' handler */ |
| 679 | static int builtin_shift(struct child_prog *child) |
| 680 | { |
| 681 | int n=1; |
| 682 | if (child->argv[1]) { |
| 683 | n=atoi(child->argv[1]); |
| 684 | } |
| 685 | if (n>=0 && n<global_argc) { |
| 686 | /* XXX This probably breaks $0 */ |
| 687 | global_argc -= n; |
| 688 | global_argv += n; |
| 689 | return EXIT_SUCCESS; |
| 690 | } else { |
| 691 | return EXIT_FAILURE; |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | /* Built-in '.' handler (read-in and execute commands from file) */ |
| 696 | static int builtin_source(struct child_prog *child) |
| 697 | { |
| 698 | FILE *input; |
| 699 | int status; |
| 700 | |
| 701 | if (child->argv[1] == NULL) |
| 702 | return EXIT_FAILURE; |
| 703 | |
| 704 | /* XXX search through $PATH is missing */ |
| 705 | input = fopen(child->argv[1], "r"); |
| 706 | if (!input) { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 707 | error_msg("Couldn't open file '%s'", child->argv[1]); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 708 | return EXIT_FAILURE; |
| 709 | } |
| 710 | |
| 711 | /* Now run the file */ |
| 712 | /* XXX argv and argc are broken; need to save old global_argv |
| 713 | * (pointer only is OK!) on this stack frame, |
| 714 | * set global_argv=child->argv+1, recurse, and restore. */ |
| 715 | mark_open(fileno(input)); |
| 716 | status = parse_file_outer(input); |
| 717 | mark_closed(fileno(input)); |
| 718 | fclose(input); |
| 719 | return (status); |
| 720 | } |
| 721 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 722 | static int builtin_umask(struct child_prog *child) |
| 723 | { |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 724 | mode_t new_umask; |
| 725 | const char *arg = child->argv[1]; |
| 726 | char *end; |
| 727 | if (arg) { |
| 728 | new_umask=strtoul(arg, &end, 8); |
| 729 | if (*end!='\0' || end == arg) { |
| 730 | return EXIT_FAILURE; |
| 731 | } |
| 732 | } else { |
| 733 | printf("%.3o\n", (unsigned int) (new_umask=umask(0))); |
| 734 | } |
| 735 | umask(new_umask); |
| 736 | return EXIT_SUCCESS; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 737 | } |
| 738 | |
| 739 | /* built-in 'unset VAR' handler */ |
| 740 | static int builtin_unset(struct child_prog *child) |
| 741 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 742 | /* bash returned already true */ |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 743 | unset_local_var(child->argv[1]); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 744 | return EXIT_SUCCESS; |
| 745 | } |
| 746 | |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 747 | static int builtin_not_written(struct child_prog *child) |
| 748 | { |
| 749 | printf("builtin_%s not written\n",child->argv[0]); |
| 750 | return EXIT_FAILURE; |
| 751 | } |
| 752 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 753 | static int b_check_space(o_string *o, int len) |
| 754 | { |
| 755 | /* It would be easy to drop a more restrictive policy |
| 756 | * in here, such as setting a maximum string length */ |
| 757 | if (o->length + len > o->maxlen) { |
| 758 | char *old_data = o->data; |
| 759 | /* assert (data == NULL || o->maxlen != 0); */ |
| 760 | o->maxlen += max(2*len, B_CHUNK); |
| 761 | o->data = realloc(o->data, 1 + o->maxlen); |
| 762 | if (o->data == NULL) { |
| 763 | free(old_data); |
| 764 | } |
| 765 | } |
| 766 | return o->data == NULL; |
| 767 | } |
| 768 | |
| 769 | static int b_addchr(o_string *o, int ch) |
| 770 | { |
| 771 | debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); |
| 772 | if (b_check_space(o, 1)) return B_NOSPAC; |
| 773 | o->data[o->length] = ch; |
| 774 | o->length++; |
| 775 | o->data[o->length] = '\0'; |
| 776 | return 0; |
| 777 | } |
| 778 | |
| 779 | static void b_reset(o_string *o) |
| 780 | { |
| 781 | o->length = 0; |
| 782 | o->nonnull = 0; |
| 783 | if (o->data != NULL) *o->data = '\0'; |
| 784 | } |
| 785 | |
| 786 | static void b_free(o_string *o) |
| 787 | { |
| 788 | b_reset(o); |
| 789 | if (o->data != NULL) free(o->data); |
| 790 | o->data = NULL; |
| 791 | o->maxlen = 0; |
| 792 | } |
| 793 | |
| 794 | /* My analysis of quoting semantics tells me that state information |
| 795 | * is associated with a destination, not a source. |
| 796 | */ |
| 797 | static int b_addqchr(o_string *o, int ch, int quote) |
| 798 | { |
| 799 | if (quote && strchr("*?[\\",ch)) { |
| 800 | int rc; |
| 801 | rc = b_addchr(o, '\\'); |
| 802 | if (rc) return rc; |
| 803 | } |
| 804 | return b_addchr(o, ch); |
| 805 | } |
| 806 | |
| 807 | /* belongs in utility.c */ |
| 808 | char *simple_itoa(unsigned int i) |
| 809 | { |
| 810 | /* 21 digits plus null terminator, good for 64-bit or smaller ints */ |
| 811 | static char local[22]; |
| 812 | char *p = &local[21]; |
| 813 | *p-- = '\0'; |
| 814 | do { |
| 815 | *p-- = '0' + i % 10; |
| 816 | i /= 10; |
| 817 | } while (i > 0); |
| 818 | return p + 1; |
| 819 | } |
| 820 | |
| 821 | static int b_adduint(o_string *o, unsigned int i) |
| 822 | { |
| 823 | int r; |
| 824 | char *p = simple_itoa(i); |
| 825 | /* no escape checking necessary */ |
| 826 | do r=b_addchr(o, *p++); while (r==0 && *p); |
| 827 | return r; |
| 828 | } |
| 829 | |
| 830 | static int static_get(struct in_str *i) |
| 831 | { |
| 832 | int ch=*i->p++; |
| 833 | if (ch=='\0') return EOF; |
| 834 | return ch; |
| 835 | } |
| 836 | |
| 837 | static int static_peek(struct in_str *i) |
| 838 | { |
| 839 | return *i->p; |
| 840 | } |
| 841 | |
| 842 | static inline void cmdedit_set_initial_prompt(void) |
| 843 | { |
Eric Andersen | 004015e | 2001-05-21 20:30:51 +0000 | [diff] [blame] | 844 | #ifndef BB_FEATURE_SH_FANCY_PROMPT |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 845 | PS1 = NULL; |
| 846 | #else |
| 847 | PS1 = getenv("PS1"); |
| 848 | if(PS1==0) |
| 849 | PS1 = "\\w \\$ "; |
| 850 | #endif |
| 851 | } |
| 852 | |
| 853 | static inline void setup_prompt_string(int promptmode, char **prompt_str) |
| 854 | { |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 855 | debug_printf("setup_prompt_string %d ",promptmode); |
Eric Andersen | 004015e | 2001-05-21 20:30:51 +0000 | [diff] [blame] | 856 | #ifndef BB_FEATURE_SH_FANCY_PROMPT |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 857 | /* Set up the prompt */ |
| 858 | if (promptmode == 1) { |
| 859 | if (PS1) |
| 860 | free(PS1); |
| 861 | PS1=xmalloc(strlen(cwd)+4); |
| 862 | sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); |
| 863 | *prompt_str = PS1; |
| 864 | } else { |
| 865 | *prompt_str = PS2; |
| 866 | } |
| 867 | #else |
| 868 | *prompt_str = (promptmode==0)? PS1 : PS2; |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 869 | #endif |
| 870 | debug_printf("result %s\n",*prompt_str); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 871 | } |
| 872 | |
| 873 | static void get_user_input(struct in_str *i) |
| 874 | { |
| 875 | char *prompt_str; |
Eric Andersen | 088875f | 2001-04-27 07:49:41 +0000 | [diff] [blame] | 876 | static char the_command[BUFSIZ]; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 877 | |
| 878 | setup_prompt_string(i->promptmode, &prompt_str); |
| 879 | #ifdef BB_FEATURE_COMMAND_EDITING |
| 880 | /* |
| 881 | ** enable command line editing only while a command line |
| 882 | ** is actually being read; otherwise, we'll end up bequeathing |
| 883 | ** atexit() handlers and other unwanted stuff to our |
| 884 | ** child processes (rob@sysgo.de) |
| 885 | */ |
| 886 | cmdedit_read_input(prompt_str, the_command); |
| 887 | cmdedit_terminate(); |
| 888 | #else |
| 889 | fputs(prompt_str, stdout); |
| 890 | fflush(stdout); |
| 891 | the_command[0]=fgetc(i->file); |
| 892 | the_command[1]='\0'; |
| 893 | #endif |
Eric Andersen | 4f6753e | 2001-05-31 17:17:12 +0000 | [diff] [blame] | 894 | fflush(stdout); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 895 | i->p = the_command; |
| 896 | } |
| 897 | |
| 898 | /* This is the magic location that prints prompts |
| 899 | * and gets data back from the user */ |
| 900 | static int file_get(struct in_str *i) |
| 901 | { |
| 902 | int ch; |
| 903 | |
| 904 | ch = 0; |
| 905 | /* If there is data waiting, eat it up */ |
| 906 | if (i->p && *i->p) { |
| 907 | ch=*i->p++; |
| 908 | } else { |
| 909 | /* need to double check i->file because we might be doing something |
| 910 | * more complicated by now, like sourcing or substituting. */ |
| 911 | if (i->__promptme && interactive && i->file == stdin) { |
Eric Andersen | 4f6753e | 2001-05-31 17:17:12 +0000 | [diff] [blame] | 912 | while(! i->p || (interactive && strlen(i->p)==0) ) { |
| 913 | get_user_input(i); |
| 914 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 915 | i->promptmode=2; |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 916 | i->__promptme = 0; |
| 917 | if (i->p && *i->p) { |
| 918 | ch=*i->p++; |
| 919 | } |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 920 | } else { |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 921 | ch = fgetc(i->file); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 922 | } |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 923 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 924 | debug_printf("b_getch: got a %d\n", ch); |
| 925 | } |
| 926 | if (ch == '\n') i->__promptme=1; |
| 927 | return ch; |
| 928 | } |
| 929 | |
| 930 | /* All the callers guarantee this routine will never be |
| 931 | * used right after a newline, so prompting is not needed. |
| 932 | */ |
| 933 | static int file_peek(struct in_str *i) |
| 934 | { |
| 935 | if (i->p && *i->p) { |
| 936 | return *i->p; |
| 937 | } else { |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 938 | i->peek_buf[0] = fgetc(i->file); |
| 939 | i->peek_buf[1] = '\0'; |
| 940 | i->p = i->peek_buf; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 941 | debug_printf("b_peek: got a %d\n", *i->p); |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 942 | return *i->p; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 943 | } |
| 944 | } |
| 945 | |
| 946 | static void setup_file_in_str(struct in_str *i, FILE *f) |
| 947 | { |
| 948 | i->peek = file_peek; |
| 949 | i->get = file_get; |
| 950 | i->__promptme=1; |
| 951 | i->promptmode=1; |
| 952 | i->file = f; |
| 953 | i->p = NULL; |
| 954 | } |
| 955 | |
| 956 | static void setup_string_in_str(struct in_str *i, const char *s) |
| 957 | { |
| 958 | i->peek = static_peek; |
| 959 | i->get = static_get; |
| 960 | i->__promptme=1; |
| 961 | i->promptmode=1; |
| 962 | i->p = s; |
| 963 | } |
| 964 | |
| 965 | static void mark_open(int fd) |
| 966 | { |
| 967 | struct close_me *new = xmalloc(sizeof(struct close_me)); |
| 968 | new->fd = fd; |
| 969 | new->next = close_me_head; |
| 970 | close_me_head = new; |
| 971 | } |
| 972 | |
| 973 | static void mark_closed(int fd) |
| 974 | { |
| 975 | struct close_me *tmp; |
| 976 | if (close_me_head == NULL || close_me_head->fd != fd) |
| 977 | error_msg_and_die("corrupt close_me"); |
| 978 | tmp = close_me_head; |
| 979 | close_me_head = close_me_head->next; |
| 980 | free(tmp); |
| 981 | } |
| 982 | |
| 983 | static void close_all() |
| 984 | { |
| 985 | struct close_me *c; |
| 986 | for (c=close_me_head; c; c=c->next) { |
| 987 | close(c->fd); |
| 988 | } |
| 989 | close_me_head = NULL; |
| 990 | } |
| 991 | |
| 992 | /* squirrel != NULL means we squirrel away copies of stdin, stdout, |
| 993 | * and stderr if they are redirected. */ |
| 994 | static int setup_redirects(struct child_prog *prog, int squirrel[]) |
| 995 | { |
| 996 | int openfd, mode; |
| 997 | struct redir_struct *redir; |
| 998 | |
| 999 | for (redir=prog->redirects; redir; redir=redir->next) { |
| 1000 | if (redir->dup == -1) { |
| 1001 | mode=redir_table[redir->type].mode; |
| 1002 | openfd = open(redir->word.gl_pathv[0], mode, 0666); |
| 1003 | if (openfd < 0) { |
| 1004 | /* this could get lost if stderr has been redirected, but |
| 1005 | bash and ash both lose it as well (though zsh doesn't!) */ |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1006 | perror_msg("error opening %s", redir->word.gl_pathv[0]); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1007 | return 1; |
| 1008 | } |
| 1009 | } else { |
| 1010 | openfd = redir->dup; |
| 1011 | } |
| 1012 | |
| 1013 | if (openfd != redir->fd) { |
| 1014 | if (squirrel && redir->fd < 3) { |
| 1015 | squirrel[redir->fd] = dup(redir->fd); |
| 1016 | } |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 1017 | if (openfd == -3) { |
| 1018 | close(openfd); |
| 1019 | } else { |
| 1020 | dup2(openfd, redir->fd); |
Matt Kraai | c616e53 | 2001-06-05 16:50:08 +0000 | [diff] [blame^] | 1021 | if (redir->dup == -1) |
| 1022 | close (openfd); |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 1023 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1024 | } |
| 1025 | } |
| 1026 | return 0; |
| 1027 | } |
| 1028 | |
| 1029 | static void restore_redirects(int squirrel[]) |
| 1030 | { |
| 1031 | int i, fd; |
| 1032 | for (i=0; i<3; i++) { |
| 1033 | fd = squirrel[i]; |
| 1034 | if (fd != -1) { |
| 1035 | /* No error checking. I sure wouldn't know what |
| 1036 | * to do with an error if I found one! */ |
| 1037 | dup2(fd, i); |
| 1038 | close(fd); |
| 1039 | } |
| 1040 | } |
| 1041 | } |
| 1042 | |
| 1043 | /* XXX this definitely needs some more thought, work, and |
| 1044 | * cribbing from other shells */ |
| 1045 | static int pipe_wait(struct pipe *pi) |
| 1046 | { |
| 1047 | int rcode=0, i, pid, running, status; |
| 1048 | running = pi->num_progs; |
| 1049 | while (running) { |
| 1050 | pid=waitpid(-1, &status, 0); |
| 1051 | if (pid < 0) perror_msg_and_die("waitpid"); |
| 1052 | for (i=0; i < pi->num_progs; i++) { |
| 1053 | if (pi->progs[i].pid == pid) { |
| 1054 | if (i==pi->num_progs-1) rcode=WEXITSTATUS(status); |
| 1055 | pi->progs[i].pid = 0; |
| 1056 | running--; |
| 1057 | break; |
| 1058 | } |
| 1059 | } |
| 1060 | } |
| 1061 | return rcode; |
| 1062 | } |
| 1063 | |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1064 | /* never returns */ |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1065 | /* XXX no exit() here. If you don't exec, use _exit instead. |
| 1066 | * The at_exit handlers apparently confuse the calling process, |
| 1067 | * in particular stdin handling. Not sure why? */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1068 | static void pseudo_exec(struct child_prog *child) |
| 1069 | { |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1070 | int i, rcode; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1071 | struct built_in_command *x; |
| 1072 | if (child->argv) { |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1073 | for (i=0; is_assignment(child->argv[i]); i++) { |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1074 | debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1075 | putenv(strdup(child->argv[i])); |
| 1076 | } |
| 1077 | child->argv+=i; /* XXX this hack isn't so horrible, since we are about |
| 1078 | to exit, and therefore don't need to keep data |
| 1079 | structures consistent for free() use. */ |
| 1080 | /* If a variable is assigned in a forest, and nobody listens, |
| 1081 | * was it ever really set? |
| 1082 | */ |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1083 | if (child->argv[0] == NULL) { |
| 1084 | _exit(EXIT_SUCCESS); |
| 1085 | } |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1086 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1087 | /* |
| 1088 | * Check if the command matches any of the builtins. |
| 1089 | * Depending on context, this might be redundant. But it's |
| 1090 | * easier to waste a few CPU cycles than it is to figure out |
| 1091 | * if this is one of those cases. |
| 1092 | */ |
| 1093 | for (x = bltins; x->cmd; x++) { |
| 1094 | if (strcmp(child->argv[0], x->cmd) == 0 ) { |
| 1095 | debug_printf("builtin exec %s\n", child->argv[0]); |
Eric Andersen | 57e6a49 | 2001-05-22 22:34:51 +0000 | [diff] [blame] | 1096 | rcode = x->function(child); |
| 1097 | fflush(stdout); |
| 1098 | _exit(rcode); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1099 | } |
| 1100 | } |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 1101 | |
| 1102 | /* Check if the command matches any busybox internal commands |
| 1103 | * ("applets") here. |
| 1104 | * FIXME: This feature is not 100% safe, since |
| 1105 | * BusyBox is not fully reentrant, so we have no guarantee the things |
| 1106 | * from the .bss are still zeroed, or that things from .data are still |
| 1107 | * at their defaults. We could exec ourself from /proc/self/exe, but I |
| 1108 | * really dislike relying on /proc for things. We could exec ourself |
| 1109 | * from global_argv[0], but if we are in a chroot, we may not be able |
| 1110 | * to find ourself... */ |
| 1111 | #ifdef BB_FEATURE_SH_STANDALONE_SHELL |
| 1112 | { |
| 1113 | int argc_l; |
| 1114 | char** argv_l=child->argv; |
| 1115 | char *name = child->argv[0]; |
| 1116 | |
| 1117 | #ifdef BB_FEATURE_SH_APPLETS_ALWAYS_WIN |
| 1118 | /* Following discussions from November 2000 on the busybox mailing |
| 1119 | * list, the default configuration, (without |
| 1120 | * get_last_path_component()) lets the user force use of an |
| 1121 | * external command by specifying the full (with slashes) filename. |
| 1122 | * If you enable BB_FEATURE_SH_APPLETS_ALWAYS_WIN, then applets |
| 1123 | * _aways_ override external commands, so if you want to run |
| 1124 | * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the |
| 1125 | * filesystem and is _not_ busybox. Some systems may want this, |
| 1126 | * most do not. */ |
| 1127 | name = get_last_path_component(name); |
| 1128 | #endif |
| 1129 | /* Count argc for use in a second... */ |
| 1130 | for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); |
| 1131 | optind = 1; |
| 1132 | debug_printf("running applet %s\n", name); |
| 1133 | run_applet_by_name(name, argc_l, child->argv); |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 1134 | } |
| 1135 | #endif |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1136 | debug_printf("exec of %s\n",child->argv[0]); |
| 1137 | execvp(child->argv[0],child->argv); |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1138 | perror_msg("couldn't exec: %s",child->argv[0]); |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1139 | _exit(1); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1140 | } else if (child->group) { |
| 1141 | debug_printf("runtime nesting to group\n"); |
| 1142 | interactive=0; /* crucial!!!! */ |
| 1143 | rcode = run_list_real(child->group); |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1144 | /* OK to leak memory by not calling free_pipe_list, |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1145 | * since this process is about to exit */ |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1146 | _exit(rcode); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1147 | } else { |
| 1148 | /* Can happen. See what bash does with ">foo" by itself. */ |
| 1149 | debug_printf("trying to pseudo_exec null command\n"); |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1150 | _exit(EXIT_SUCCESS); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1151 | } |
| 1152 | } |
| 1153 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1154 | static void insert_bg_job(struct pipe *pi) |
| 1155 | { |
| 1156 | struct pipe *thejob; |
| 1157 | |
| 1158 | /* Linear search for the ID of the job to use */ |
| 1159 | pi->jobid = 1; |
| 1160 | for (thejob = job_list->head; thejob; thejob = thejob->next) |
| 1161 | if (thejob->jobid >= pi->jobid) |
| 1162 | pi->jobid = thejob->jobid + 1; |
| 1163 | |
| 1164 | /* add thejob to the list of running jobs */ |
| 1165 | if (!job_list->head) { |
| 1166 | thejob = job_list->head = xmalloc(sizeof(*thejob)); |
| 1167 | } else { |
| 1168 | for (thejob = job_list->head; thejob->next; thejob = thejob->next) /* nothing */; |
| 1169 | thejob->next = xmalloc(sizeof(*thejob)); |
| 1170 | thejob = thejob->next; |
| 1171 | } |
| 1172 | |
| 1173 | /* physically copy the struct job */ |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1174 | memcpy(thejob, pi, sizeof(struct pipe)); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1175 | thejob->next = NULL; |
| 1176 | thejob->running_progs = thejob->num_progs; |
| 1177 | thejob->stopped_progs = 0; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1178 | thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ |
Eric Andersen | 1a6d39b | 2001-05-08 05:11:54 +0000 | [diff] [blame] | 1179 | |
| 1180 | //if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) |
| 1181 | { |
| 1182 | char *bar=thejob->text; |
| 1183 | char **foo=pi->progs[0].argv; |
| 1184 | while(foo && *foo) { |
| 1185 | bar += sprintf(bar, "%s ", *foo++); |
| 1186 | } |
| 1187 | } |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1188 | |
| 1189 | /* we don't wait for background thejobs to return -- append it |
| 1190 | to the list of backgrounded thejobs and leave it alone */ |
Eric Andersen | 1a6d39b | 2001-05-08 05:11:54 +0000 | [diff] [blame] | 1191 | printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); |
| 1192 | last_bg_pid = thejob->progs[0].pid; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1193 | } |
| 1194 | |
| 1195 | /* remove a backgrounded job from a jobset */ |
| 1196 | static void remove_bg_job(struct pipe *pi) |
| 1197 | { |
| 1198 | struct pipe *prev_pipe; |
| 1199 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1200 | if (pi == job_list->head) { |
| 1201 | job_list->head = pi->next; |
| 1202 | } else { |
| 1203 | prev_pipe = job_list->head; |
| 1204 | while (prev_pipe->next != pi) |
| 1205 | prev_pipe = prev_pipe->next; |
| 1206 | prev_pipe->next = pi->next; |
| 1207 | } |
| 1208 | |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1209 | free_pipe(pi, 0); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1210 | free(pi); |
| 1211 | } |
| 1212 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1213 | /* Checks to see if any background processes have exited -- if they |
| 1214 | have, figure out why and see if a job has completed */ |
| 1215 | static void checkjobs() |
| 1216 | { |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1217 | int status, ctty; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1218 | int prognum = 0; |
| 1219 | struct pipe *pi; |
| 1220 | pid_t childpid; |
| 1221 | |
| 1222 | while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) { |
| 1223 | for (pi = job_list->head; pi; pi = pi->next) { |
| 1224 | prognum = 0; |
| 1225 | while (prognum < pi->num_progs && |
| 1226 | pi->progs[prognum].pid != childpid) prognum++; |
| 1227 | if (prognum < pi->num_progs) |
| 1228 | break; |
| 1229 | } |
| 1230 | |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1231 | if(pi==NULL) { |
| 1232 | debug_printf("checkjobs: pid %d was not in our list!\n", childpid); |
| 1233 | continue; |
| 1234 | } |
Eric Andersen | aeb44c4 | 2001-05-22 20:29:00 +0000 | [diff] [blame] | 1235 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1236 | if (WIFEXITED(status) || WIFSIGNALED(status)) { |
| 1237 | /* child exited */ |
| 1238 | pi->running_progs--; |
| 1239 | pi->progs[prognum].pid = 0; |
| 1240 | |
| 1241 | if (!pi->running_progs) { |
| 1242 | printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); |
| 1243 | remove_bg_job(pi); |
| 1244 | } |
| 1245 | } else { |
| 1246 | /* child stopped */ |
| 1247 | pi->stopped_progs++; |
| 1248 | pi->progs[prognum].is_stopped = 1; |
| 1249 | |
| 1250 | if (pi->stopped_progs == pi->num_progs) { |
Eric Andersen | 1a6d39b | 2001-05-08 05:11:54 +0000 | [diff] [blame] | 1251 | printf(JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1252 | } |
| 1253 | } |
| 1254 | } |
| 1255 | |
Matt Kraai | 80abc45 | 2001-05-02 21:48:17 +0000 | [diff] [blame] | 1256 | if (childpid == -1 && errno != ECHILD) |
| 1257 | perror_msg("waitpid"); |
| 1258 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1259 | /* move the shell to the foreground */ |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1260 | if (interactive && (ctty=controlling_tty(0))!=-1) { |
| 1261 | if (tcsetpgrp(ctty, getpgrp())) |
| 1262 | perror_msg("tcsetpgrp-2"); |
| 1263 | } |
| 1264 | } |
| 1265 | |
| 1266 | /* Figure out our controlling tty, checking in order stderr, |
| 1267 | * stdin, and stdout. If check_pgrp is set, also check that |
| 1268 | * we belong to the foreground process group associated with |
| 1269 | * that tty. The value of ctty is needed in order to call |
| 1270 | * tcsetpgrp(ctty, ...); */ |
| 1271 | int controlling_tty(int check_pgrp) |
| 1272 | { |
| 1273 | pid_t curpgrp; |
| 1274 | int ctty; |
| 1275 | |
| 1276 | if ((curpgrp = tcgetpgrp(ctty = 2)) < 0 |
| 1277 | && (curpgrp = tcgetpgrp(ctty = 0)) < 0 |
| 1278 | && (curpgrp = tcgetpgrp(ctty = 1)) < 0) |
| 1279 | return errno = ENOTTY, -1; |
| 1280 | |
| 1281 | if (check_pgrp && curpgrp != getpgrp()) |
| 1282 | return errno = EPERM, -1; |
| 1283 | |
| 1284 | return ctty; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1285 | } |
| 1286 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1287 | /* run_pipe_real() starts all the jobs, but doesn't wait for anything |
| 1288 | * to finish. See pipe_wait(). |
| 1289 | * |
| 1290 | * return code is normally -1, when the caller has to wait for children |
| 1291 | * to finish to determine the exit status of the pipe. If the pipe |
| 1292 | * is a simple builtin command, however, the action is done by the |
| 1293 | * time run_pipe_real returns, and the exit code is provided as the |
| 1294 | * return value. |
| 1295 | * |
| 1296 | * The input of the pipe is always stdin, the output is always |
| 1297 | * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, |
| 1298 | * because it tries to avoid running the command substitution in |
| 1299 | * subshell, when that is in fact necessary. The subshell process |
| 1300 | * now has its stdout directed to the input of the appropriate pipe, |
| 1301 | * so this routine is noticeably simpler. |
| 1302 | */ |
| 1303 | static int run_pipe_real(struct pipe *pi) |
| 1304 | { |
| 1305 | int i; |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1306 | int ctty; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1307 | int nextin, nextout; |
| 1308 | int pipefds[2]; /* pipefds[0] is for reading */ |
| 1309 | struct child_prog *child; |
| 1310 | struct built_in_command *x; |
| 1311 | |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1312 | ctty = -1; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1313 | nextin = 0; |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1314 | pi->pgrp = -1; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1315 | |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1316 | /* Check if we are supposed to run in the foreground */ |
Eric Andersen | 2dcfba7 | 2001-05-04 22:13:37 +0000 | [diff] [blame] | 1317 | if (interactive && pi->followup!=PIPE_BG) { |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1318 | if ((ctty = controlling_tty(pi->pgrp<0)) < 0) return -1; |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1319 | } |
| 1320 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1321 | /* Check if this is a simple builtin (not part of a pipe). |
| 1322 | * Builtins within pipes have to fork anyway, and are handled in |
| 1323 | * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. |
| 1324 | */ |
| 1325 | if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { |
| 1326 | child = & (pi->progs[0]); |
| 1327 | if (child->group && ! child->subshell) { |
| 1328 | int squirrel[] = {-1, -1, -1}; |
| 1329 | int rcode; |
| 1330 | debug_printf("non-subshell grouping\n"); |
| 1331 | setup_redirects(child, squirrel); |
| 1332 | /* XXX could we merge code with following builtin case, |
| 1333 | * by creating a pseudo builtin that calls run_list_real? */ |
| 1334 | rcode = run_list_real(child->group); |
| 1335 | restore_redirects(squirrel); |
| 1336 | return rcode; |
| 1337 | } |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1338 | for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } |
| 1339 | if (i!=0 && child->argv[i]==NULL) { |
| 1340 | /* assignments, but no command: set the local environment */ |
| 1341 | for (i=0; child->argv[i]!=NULL; i++) { |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1342 | |
| 1343 | /* Ok, this case is tricky. We have to decide if this is a |
| 1344 | * local variable, or an already exported variable. If it is |
| 1345 | * already exported, we have to export the new value. If it is |
| 1346 | * not exported, we need only set this as a local variable. |
| 1347 | * This junk is all to decide whether or not to export this |
| 1348 | * variable. */ |
| 1349 | int export_me=0; |
| 1350 | char *name, *value; |
| 1351 | name = strdup(child->argv[i]); |
| 1352 | value = strchr(name, '='); |
| 1353 | if (value) |
| 1354 | *value=0; |
| 1355 | if ( get_local_var(name)) { |
| 1356 | export_me=1; |
| 1357 | } |
| 1358 | free(name); |
| 1359 | set_local_var(child->argv[i], export_me); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1360 | } |
| 1361 | return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ |
| 1362 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1363 | for (x = bltins; x->cmd; x++) { |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1364 | if (strcmp(child->argv[i], x->cmd) == 0 ) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1365 | int squirrel[] = {-1, -1, -1}; |
| 1366 | int rcode; |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1367 | if (x->function == builtin_exec && child->argv[i+1]==NULL) { |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 1368 | debug_printf("magic exec\n"); |
| 1369 | setup_redirects(child,NULL); |
| 1370 | return EXIT_SUCCESS; |
| 1371 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1372 | debug_printf("builtin inline %s\n", child->argv[0]); |
| 1373 | /* XXX setup_redirects acts on file descriptors, not FILEs. |
| 1374 | * This is perfect for work that comes after exec(). |
| 1375 | * Is it really safe for inline use? Experimentally, |
| 1376 | * things seem to work with glibc. */ |
| 1377 | setup_redirects(child, squirrel); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1378 | for (i=0; is_assignment(child->argv[i]); i++) { |
| 1379 | putenv(strdup(child->argv[i])); |
| 1380 | } |
| 1381 | child->argv+=i; /* XXX horrible hack */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1382 | rcode = x->function(child); |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1383 | child->argv-=i; /* XXX restore hack so free() can work right */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1384 | restore_redirects(squirrel); |
| 1385 | return rcode; |
| 1386 | } |
| 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | for (i = 0; i < pi->num_progs; i++) { |
| 1391 | child = & (pi->progs[i]); |
| 1392 | |
| 1393 | /* pipes are inserted between pairs of commands */ |
| 1394 | if ((i + 1) < pi->num_progs) { |
| 1395 | if (pipe(pipefds)<0) perror_msg_and_die("pipe"); |
| 1396 | nextout = pipefds[1]; |
| 1397 | } else { |
| 1398 | nextout=1; |
| 1399 | pipefds[0] = -1; |
| 1400 | } |
| 1401 | |
| 1402 | /* XXX test for failed fork()? */ |
| 1403 | if (!(child->pid = fork())) { |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1404 | |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1405 | signal(SIGTTOU, SIG_DFL); |
| 1406 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1407 | close_all(); |
| 1408 | |
| 1409 | if (nextin != 0) { |
| 1410 | dup2(nextin, 0); |
| 1411 | close(nextin); |
| 1412 | } |
| 1413 | if (nextout != 1) { |
| 1414 | dup2(nextout, 1); |
| 1415 | close(nextout); |
| 1416 | } |
| 1417 | if (pipefds[0]!=-1) { |
| 1418 | close(pipefds[0]); /* opposite end of our output pipe */ |
| 1419 | } |
| 1420 | |
| 1421 | /* Like bash, explicit redirects override pipes, |
| 1422 | * and the pipe fd is available for dup'ing. */ |
| 1423 | setup_redirects(child,NULL); |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1424 | |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1425 | if (interactive && pi->followup!=PIPE_BG) { |
Eric Andersen | bfae252 | 2001-05-17 00:14:27 +0000 | [diff] [blame] | 1426 | /* If we (the child) win the race, put ourselves in the process |
| 1427 | * group whose leader is the first process in this pipe. */ |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1428 | if (pi->pgrp < 0) { |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1429 | pi->pgrp = getpid(); |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1430 | } |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1431 | if (setpgid(0, pi->pgrp) == 0) { |
| 1432 | signal(SIGTTOU, SIG_IGN); |
| 1433 | tcsetpgrp(ctty, pi->pgrp); |
| 1434 | signal(SIGTTOU, SIG_DFL); |
| 1435 | } |
| 1436 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1437 | |
| 1438 | pseudo_exec(child); |
| 1439 | } |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1440 | /* Put our child in the process group whose leader is the |
| 1441 | * first process in this pipe. */ |
| 1442 | if (pi->pgrp < 0) { |
| 1443 | pi->pgrp = child->pid; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1444 | } |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1445 | /* Don't check for errors. The child may be dead already, |
| 1446 | * in which case setpgid returns error code EACCES. */ |
| 1447 | setpgid(child->pid, pi->pgrp); |
| 1448 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1449 | if (nextin != 0) |
| 1450 | close(nextin); |
| 1451 | if (nextout != 1) |
| 1452 | close(nextout); |
| 1453 | |
| 1454 | /* If there isn't another process, nextin is garbage |
| 1455 | but it doesn't matter */ |
| 1456 | nextin = pipefds[0]; |
| 1457 | } |
| 1458 | return -1; |
| 1459 | } |
| 1460 | |
| 1461 | static int run_list_real(struct pipe *pi) |
| 1462 | { |
| 1463 | int rcode=0; |
| 1464 | 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] | 1465 | reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1466 | for (;pi;pi=pi->next) { |
| 1467 | rmode = pi->r_mode; |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 1468 | 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); |
| 1469 | if (rmode == skip_more_in_this_rmode) continue; |
| 1470 | skip_more_in_this_rmode = RES_XXXX; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1471 | if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; |
| 1472 | if (rmode == RES_THEN && if_code) continue; |
| 1473 | if (rmode == RES_ELSE && !if_code) continue; |
| 1474 | if (rmode == RES_ELIF && !if_code) continue; |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 1475 | if (pi->num_progs == 0) continue; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1476 | rcode = run_pipe_real(pi); |
| 1477 | if (rcode!=-1) { |
| 1478 | /* We only ran a builtin: rcode was set by the return value |
| 1479 | * of run_pipe_real(), and we don't need to wait for anything. */ |
| 1480 | } else if (pi->followup==PIPE_BG) { |
| 1481 | /* XXX check bash's behavior with nontrivial pipes */ |
| 1482 | /* XXX compute jobid */ |
| 1483 | /* XXX what does bash do with attempts to background builtins? */ |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1484 | insert_bg_job(pi); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1485 | rcode = EXIT_SUCCESS; |
| 1486 | } else { |
Eric Andersen | 0fcd447 | 2001-05-02 20:12:03 +0000 | [diff] [blame] | 1487 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1488 | if (interactive) { |
| 1489 | /* move the new process group into the foreground */ |
| 1490 | /* suppress messages when run from /linuxrc mag@sysgo.de */ |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1491 | /* XXX probably this "0" should come from controlling_tty() */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1492 | if (tcsetpgrp(0, pi->pgrp) && errno != ENOTTY) |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1493 | perror_msg("tcsetpgrp-3"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1494 | rcode = pipe_wait(pi); |
Matt Kraai | 1c8a59a | 2001-05-02 15:37:09 +0000 | [diff] [blame] | 1495 | if (tcsetpgrp(0, getpgrp()) && errno != ENOTTY) |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 1496 | perror_msg("tcsetpgrp-4"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1497 | } else { |
| 1498 | rcode = pipe_wait(pi); |
| 1499 | } |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 1500 | debug_printf("pipe_wait returned %d\n",rcode); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1501 | } |
| 1502 | last_return_code=rcode; |
| 1503 | if ( rmode == RES_IF || rmode == RES_ELIF ) |
| 1504 | next_if_code=rcode; /* can be overwritten a number of times */ |
| 1505 | if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || |
| 1506 | (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) |
Eric Andersen | 4ed5e37 | 2001-05-01 01:49:50 +0000 | [diff] [blame] | 1507 | skip_more_in_this_rmode=rmode; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1508 | } |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1509 | checkjobs(); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1510 | return rcode; |
| 1511 | } |
| 1512 | |
| 1513 | /* broken, of course, but OK for testing */ |
| 1514 | static char *indenter(int i) |
| 1515 | { |
| 1516 | static char blanks[]=" "; |
| 1517 | return &blanks[sizeof(blanks)-i-1]; |
| 1518 | } |
| 1519 | |
| 1520 | /* return code is the exit status of the pipe */ |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1521 | static int free_pipe(struct pipe *pi, int indent) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1522 | { |
| 1523 | char **p; |
| 1524 | struct child_prog *child; |
| 1525 | struct redir_struct *r, *rnext; |
| 1526 | int a, i, ret_code=0; |
| 1527 | char *ind = indenter(indent); |
| 1528 | final_printf("%s run pipe: (pid %d)\n",ind,getpid()); |
| 1529 | for (i=0; i<pi->num_progs; i++) { |
| 1530 | child = &pi->progs[i]; |
| 1531 | final_printf("%s command %d:\n",ind,i); |
| 1532 | if (child->argv) { |
| 1533 | for (a=0,p=child->argv; *p; a++,p++) { |
| 1534 | final_printf("%s argv[%d] = %s\n",ind,a,*p); |
| 1535 | } |
| 1536 | globfree(&child->glob_result); |
| 1537 | child->argv=NULL; |
| 1538 | } else if (child->group) { |
| 1539 | final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1540 | ret_code = free_pipe_list(child->group,indent+3); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1541 | final_printf("%s end group\n",ind); |
| 1542 | } else { |
| 1543 | final_printf("%s (nil)\n",ind); |
| 1544 | } |
| 1545 | for (r=child->redirects; r; r=rnext) { |
| 1546 | final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); |
| 1547 | if (r->dup == -1) { |
| 1548 | final_printf(" %s\n", *r->word.gl_pathv); |
| 1549 | globfree(&r->word); |
| 1550 | } else { |
| 1551 | final_printf("&%d\n", r->dup); |
| 1552 | } |
| 1553 | rnext=r->next; |
| 1554 | free(r); |
| 1555 | } |
| 1556 | child->redirects=NULL; |
| 1557 | } |
| 1558 | free(pi->progs); /* children are an array, they get freed all at once */ |
| 1559 | pi->progs=NULL; |
| 1560 | return ret_code; |
| 1561 | } |
| 1562 | |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1563 | static int free_pipe_list(struct pipe *head, int indent) |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1564 | { |
| 1565 | int rcode=0; /* if list has no members */ |
| 1566 | struct pipe *pi, *next; |
| 1567 | char *ind = indenter(indent); |
| 1568 | for (pi=head; pi; pi=next) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1569 | final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1570 | rcode = free_pipe(pi, indent); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1571 | final_printf("%s pipe followup code %d\n", ind, pi->followup); |
| 1572 | next=pi->next; |
| 1573 | pi->next=NULL; |
| 1574 | free(pi); |
| 1575 | } |
| 1576 | return rcode; |
| 1577 | } |
| 1578 | |
| 1579 | /* Select which version we will use */ |
| 1580 | static int run_list(struct pipe *pi) |
| 1581 | { |
| 1582 | int rcode=0; |
| 1583 | if (fake_mode==0) { |
| 1584 | rcode = run_list_real(pi); |
| 1585 | } |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1586 | /* free_pipe_list has the side effect of clearing memory |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1587 | * In the long run that function can be merged with run_list_real, |
| 1588 | * but doing that now would hobble the debugging effort. */ |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 1589 | free_pipe_list(pi,0); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1590 | return rcode; |
| 1591 | } |
| 1592 | |
| 1593 | /* The API for glob is arguably broken. This routine pushes a non-matching |
| 1594 | * string into the output structure, removing non-backslashed backslashes. |
| 1595 | * If someone can prove me wrong, by performing this function within the |
| 1596 | * original glob(3) api, feel free to rewrite this routine into oblivion. |
| 1597 | * Return code (0 vs. GLOB_NOSPACE) matches glob(3). |
| 1598 | * XXX broken if the last character is '\\', check that before calling. |
| 1599 | */ |
| 1600 | static int globhack(const char *src, int flags, glob_t *pglob) |
| 1601 | { |
| 1602 | int cnt, pathc; |
| 1603 | const char *s; |
| 1604 | char *dest; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1605 | for (cnt=1, s=src; *s; s++) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1606 | if (*s == '\\') s++; |
| 1607 | cnt++; |
| 1608 | } |
| 1609 | dest = malloc(cnt); |
| 1610 | if (!dest) return GLOB_NOSPACE; |
| 1611 | if (!(flags & GLOB_APPEND)) { |
| 1612 | pglob->gl_pathv=NULL; |
| 1613 | pglob->gl_pathc=0; |
| 1614 | pglob->gl_offs=0; |
| 1615 | pglob->gl_offs=0; |
| 1616 | } |
| 1617 | pathc = ++pglob->gl_pathc; |
| 1618 | pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); |
| 1619 | if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; |
| 1620 | pglob->gl_pathv[pathc-1]=dest; |
| 1621 | pglob->gl_pathv[pathc]=NULL; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 1622 | for (s=src; *s; s++, dest++) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1623 | if (*s == '\\') s++; |
| 1624 | *dest = *s; |
| 1625 | } |
| 1626 | *dest='\0'; |
| 1627 | return 0; |
| 1628 | } |
| 1629 | |
| 1630 | /* XXX broken if the last character is '\\', check that before calling */ |
| 1631 | static int glob_needed(const char *s) |
| 1632 | { |
| 1633 | for (; *s; s++) { |
| 1634 | if (*s == '\\') s++; |
| 1635 | if (strchr("*[?",*s)) return 1; |
| 1636 | } |
| 1637 | return 0; |
| 1638 | } |
| 1639 | |
| 1640 | #if 0 |
| 1641 | static void globprint(glob_t *pglob) |
| 1642 | { |
| 1643 | int i; |
| 1644 | debug_printf("glob_t at %p:\n", pglob); |
| 1645 | debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", |
| 1646 | pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); |
| 1647 | for (i=0; i<pglob->gl_pathc; i++) |
| 1648 | debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, |
| 1649 | pglob->gl_pathv[i], pglob->gl_pathv[i]); |
| 1650 | } |
| 1651 | #endif |
| 1652 | |
| 1653 | static int xglob(o_string *dest, int flags, glob_t *pglob) |
| 1654 | { |
| 1655 | int gr; |
| 1656 | |
| 1657 | /* short-circuit for null word */ |
| 1658 | /* we can code this better when the debug_printf's are gone */ |
| 1659 | if (dest->length == 0) { |
| 1660 | if (dest->nonnull) { |
| 1661 | /* bash man page calls this an "explicit" null */ |
| 1662 | gr = globhack(dest->data, flags, pglob); |
| 1663 | debug_printf("globhack returned %d\n",gr); |
| 1664 | } else { |
| 1665 | return 0; |
| 1666 | } |
| 1667 | } else if (glob_needed(dest->data)) { |
| 1668 | gr = glob(dest->data, flags, NULL, pglob); |
| 1669 | debug_printf("glob returned %d\n",gr); |
| 1670 | if (gr == GLOB_NOMATCH) { |
| 1671 | /* quote removal, or more accurately, backslash removal */ |
| 1672 | gr = globhack(dest->data, flags, pglob); |
| 1673 | debug_printf("globhack returned %d\n",gr); |
| 1674 | } |
| 1675 | } else { |
| 1676 | gr = globhack(dest->data, flags, pglob); |
| 1677 | debug_printf("globhack returned %d\n",gr); |
| 1678 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1679 | if (gr == GLOB_NOSPACE) |
| 1680 | error_msg_and_die("out of memory during glob"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1681 | if (gr != 0) { /* GLOB_ABORTED ? */ |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1682 | error_msg("glob(3) error %d",gr); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1683 | } |
| 1684 | /* globprint(glob_target); */ |
| 1685 | return gr; |
| 1686 | } |
| 1687 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1688 | /* This is used to get/check local shell variables */ |
| 1689 | static char *get_local_var(const char *s) |
| 1690 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1691 | struct variables *cur; |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1692 | |
| 1693 | if (!s) |
| 1694 | return NULL; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1695 | for (cur = top_vars; cur; cur=cur->next) |
| 1696 | if(strcmp(cur->name, s)==0) |
| 1697 | return cur->value; |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1698 | return NULL; |
| 1699 | } |
| 1700 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1701 | /* This is used to set local shell variables |
| 1702 | flg_export==0 if only local (not exporting) variable |
| 1703 | flg_export==1 if "new" exporting environ |
| 1704 | flg_export>1 if current startup environ (not call putenv()) */ |
| 1705 | static int set_local_var(const char *s, int flg_export) |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1706 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1707 | char *name, *value; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1708 | int result=0; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1709 | struct variables *cur; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1710 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1711 | name=strdup(s); |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1712 | |
| 1713 | /* Assume when we enter this function that we are already in |
| 1714 | * NAME=VALUE format. So the first order of business is to |
| 1715 | * split 's' on the '=' into 'name' and 'value' */ |
| 1716 | value = strchr(name, '='); |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1717 | if (value==0 && ++value==0) { |
| 1718 | free(name); |
| 1719 | return -1; |
| 1720 | } |
| 1721 | *value++ = 0; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1722 | |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1723 | for(cur = top_vars; cur; cur = cur->next) { |
| 1724 | if(strcmp(cur->name, name)==0) |
| 1725 | break; |
| 1726 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1727 | |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1728 | if(cur) { |
| 1729 | if(strcmp(cur->value, value)==0) { |
| 1730 | if(flg_export>0 && cur->flg_export==0) |
| 1731 | cur->flg_export=flg_export; |
| 1732 | else |
| 1733 | result++; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1734 | } else { |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1735 | if(cur->flg_read_only) { |
| 1736 | error_msg("%s: readonly variable", name); |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1737 | result = -1; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1738 | } else { |
Eric Andersen | 9978576 | 2001-05-22 21:37:48 +0000 | [diff] [blame] | 1739 | if(flg_export>0 || cur->flg_export>1) |
| 1740 | cur->flg_export=1; |
| 1741 | free(cur->value); |
| 1742 | |
| 1743 | cur->value = strdup(value); |
| 1744 | } |
| 1745 | } |
| 1746 | } else { |
| 1747 | cur = malloc(sizeof(struct variables)); |
| 1748 | if(!cur) { |
| 1749 | result = -1; |
| 1750 | } else { |
| 1751 | cur->name = strdup(name); |
| 1752 | if(cur->name == 0) { |
| 1753 | free(cur); |
| 1754 | result = -1; |
| 1755 | } else { |
| 1756 | struct variables *bottom = top_vars; |
| 1757 | cur->value = strdup(value); |
| 1758 | cur->next = 0; |
| 1759 | cur->flg_export = flg_export; |
| 1760 | cur->flg_read_only = 0; |
| 1761 | while(bottom->next) bottom=bottom->next; |
| 1762 | bottom->next = cur; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1763 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1764 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1765 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1766 | |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1767 | if(result==0 && cur->flg_export==1) { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1768 | *(value-1) = '='; |
| 1769 | result = putenv(name); |
| 1770 | } else { |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1771 | free(name); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1772 | if(result>0) /* equivalent to previous set */ |
| 1773 | result = 0; |
| 1774 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1775 | return result; |
| 1776 | } |
| 1777 | |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1778 | static void unset_local_var(const char *name) |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1779 | { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1780 | struct variables *cur; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1781 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1782 | if (name) { |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1783 | for (cur = top_vars; cur; cur=cur->next) { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1784 | if(strcmp(cur->name, name)==0) |
| 1785 | break; |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1786 | } |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1787 | if(cur!=0) { |
| 1788 | struct variables *next = top_vars; |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 1789 | if(cur->flg_read_only) { |
| 1790 | error_msg("%s: readonly variable", name); |
| 1791 | return; |
| 1792 | } else { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1793 | if(cur->flg_export) |
| 1794 | unsetenv(cur->name); |
| 1795 | free(cur->name); |
| 1796 | free(cur->value); |
| 1797 | while (next->next != cur) |
| 1798 | next = next->next; |
| 1799 | next->next = cur->next; |
| 1800 | } |
| 1801 | free(cur); |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 1802 | } |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 1803 | } |
Eric Andersen | 78a7c99 | 2001-05-15 16:30:25 +0000 | [diff] [blame] | 1804 | } |
| 1805 | |
| 1806 | static int is_assignment(const char *s) |
| 1807 | { |
| 1808 | if (s==NULL || !isalpha(*s)) return 0; |
| 1809 | ++s; |
| 1810 | while(isalnum(*s) || *s=='_') ++s; |
| 1811 | return *s=='='; |
| 1812 | } |
| 1813 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1814 | /* the src parameter allows us to peek forward to a possible &n syntax |
| 1815 | * for file descriptor duplication, e.g., "2>&1". |
| 1816 | * Return code is 0 normally, 1 if a syntax error is detected in src. |
| 1817 | * Resource errors (in xmalloc) cause the process to exit */ |
| 1818 | static int setup_redirect(struct p_context *ctx, int fd, redir_type style, |
| 1819 | struct in_str *input) |
| 1820 | { |
| 1821 | struct child_prog *child=ctx->child; |
| 1822 | struct redir_struct *redir = child->redirects; |
| 1823 | struct redir_struct *last_redir=NULL; |
| 1824 | |
| 1825 | /* Create a new redir_struct and drop it onto the end of the linked list */ |
| 1826 | while(redir) { |
| 1827 | last_redir=redir; |
| 1828 | redir=redir->next; |
| 1829 | } |
| 1830 | redir = xmalloc(sizeof(struct redir_struct)); |
| 1831 | redir->next=NULL; |
| 1832 | if (last_redir) { |
| 1833 | last_redir->next=redir; |
| 1834 | } else { |
| 1835 | child->redirects=redir; |
| 1836 | } |
| 1837 | |
| 1838 | redir->type=style; |
| 1839 | redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; |
| 1840 | |
| 1841 | debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); |
| 1842 | |
| 1843 | /* Check for a '2>&1' type redirect */ |
| 1844 | redir->dup = redirect_dup_num(input); |
| 1845 | if (redir->dup == -2) return 1; /* syntax error */ |
| 1846 | if (redir->dup != -1) { |
| 1847 | /* Erik had a check here that the file descriptor in question |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 1848 | * is legit; I postpone that to "run time" |
| 1849 | * A "-" representation of "close me" shows up as a -3 here */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1850 | debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); |
| 1851 | } else { |
| 1852 | /* We do _not_ try to open the file that src points to, |
| 1853 | * since we need to return and let src be expanded first. |
| 1854 | * Set ctx->pending_redirect, so we know what to do at the |
| 1855 | * end of the next parsed word. |
| 1856 | */ |
| 1857 | ctx->pending_redirect = redir; |
| 1858 | } |
| 1859 | return 0; |
| 1860 | } |
| 1861 | |
| 1862 | struct pipe *new_pipe(void) { |
| 1863 | struct pipe *pi; |
| 1864 | pi = xmalloc(sizeof(struct pipe)); |
| 1865 | pi->num_progs = 0; |
| 1866 | pi->progs = NULL; |
| 1867 | pi->next = NULL; |
| 1868 | pi->followup = 0; /* invalid */ |
| 1869 | return pi; |
| 1870 | } |
| 1871 | |
| 1872 | static void initialize_context(struct p_context *ctx) |
| 1873 | { |
| 1874 | ctx->pipe=NULL; |
| 1875 | ctx->pending_redirect=NULL; |
| 1876 | ctx->child=NULL; |
| 1877 | ctx->list_head=new_pipe(); |
| 1878 | ctx->pipe=ctx->list_head; |
| 1879 | ctx->w=RES_NONE; |
| 1880 | ctx->stack=NULL; |
| 1881 | done_command(ctx); /* creates the memory for working child */ |
| 1882 | } |
| 1883 | |
| 1884 | /* normal return is 0 |
| 1885 | * if a reserved word is found, and processed, return 1 |
| 1886 | * should handle if, then, elif, else, fi, for, while, until, do, done. |
| 1887 | * case, function, and select are obnoxious, save those for later. |
| 1888 | */ |
| 1889 | int reserved_word(o_string *dest, struct p_context *ctx) |
| 1890 | { |
| 1891 | struct reserved_combo { |
| 1892 | char *literal; |
| 1893 | int code; |
| 1894 | long flag; |
| 1895 | }; |
| 1896 | /* Mostly a list of accepted follow-up reserved words. |
| 1897 | * FLAG_END means we are done with the sequence, and are ready |
| 1898 | * to turn the compound list into a command. |
| 1899 | * FLAG_START means the word must start a new compound list. |
| 1900 | */ |
| 1901 | static struct reserved_combo reserved_list[] = { |
| 1902 | { "if", RES_IF, FLAG_THEN | FLAG_START }, |
| 1903 | { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, |
| 1904 | { "elif", RES_ELIF, FLAG_THEN }, |
| 1905 | { "else", RES_ELSE, FLAG_FI }, |
| 1906 | { "fi", RES_FI, FLAG_END }, |
| 1907 | { "for", RES_FOR, FLAG_DO | FLAG_START }, |
| 1908 | { "while", RES_WHILE, FLAG_DO | FLAG_START }, |
| 1909 | { "until", RES_UNTIL, FLAG_DO | FLAG_START }, |
| 1910 | { "do", RES_DO, FLAG_DONE }, |
| 1911 | { "done", RES_DONE, FLAG_END } |
| 1912 | }; |
| 1913 | struct reserved_combo *r; |
| 1914 | for (r=reserved_list; |
| 1915 | #define NRES sizeof(reserved_list)/sizeof(struct reserved_combo) |
| 1916 | r<reserved_list+NRES; r++) { |
| 1917 | if (strcmp(dest->data, r->literal) == 0) { |
| 1918 | debug_printf("found reserved word %s, code %d\n",r->literal,r->code); |
| 1919 | if (r->flag & FLAG_START) { |
| 1920 | struct p_context *new = xmalloc(sizeof(struct p_context)); |
| 1921 | debug_printf("push stack\n"); |
| 1922 | *new = *ctx; /* physical copy */ |
| 1923 | initialize_context(ctx); |
| 1924 | ctx->stack=new; |
| 1925 | } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 1926 | syntax(); |
| 1927 | ctx->w = RES_SNTX; |
| 1928 | b_reset (dest); |
| 1929 | return 1; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1930 | } |
| 1931 | ctx->w=r->code; |
| 1932 | ctx->old_flag = r->flag; |
| 1933 | if (ctx->old_flag & FLAG_END) { |
| 1934 | struct p_context *old; |
| 1935 | debug_printf("pop stack\n"); |
| 1936 | old = ctx->stack; |
| 1937 | old->child->group = ctx->list_head; |
| 1938 | *ctx = *old; /* physical copy */ |
| 1939 | free(old); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1940 | } |
| 1941 | b_reset (dest); |
| 1942 | return 1; |
| 1943 | } |
| 1944 | } |
| 1945 | return 0; |
| 1946 | } |
| 1947 | |
| 1948 | /* normal return is 0. |
| 1949 | * Syntax or xglob errors return 1. */ |
| 1950 | static int done_word(o_string *dest, struct p_context *ctx) |
| 1951 | { |
| 1952 | struct child_prog *child=ctx->child; |
| 1953 | glob_t *glob_target; |
| 1954 | int gr, flags = 0; |
| 1955 | |
| 1956 | debug_printf("done_word: %s %p\n", dest->data, child); |
| 1957 | if (dest->length == 0 && !dest->nonnull) { |
| 1958 | debug_printf(" true null, ignored\n"); |
| 1959 | return 0; |
| 1960 | } |
| 1961 | if (ctx->pending_redirect) { |
| 1962 | glob_target = &ctx->pending_redirect->word; |
| 1963 | } else { |
| 1964 | if (child->group) { |
| 1965 | syntax(); |
| 1966 | return 1; /* syntax error, groups and arglists don't mix */ |
| 1967 | } |
| 1968 | if (!child->argv) { |
| 1969 | debug_printf("checking %s for reserved-ness\n",dest->data); |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 1970 | if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1971 | } |
| 1972 | glob_target = &child->glob_result; |
| 1973 | if (child->argv) flags |= GLOB_APPEND; |
| 1974 | } |
| 1975 | gr = xglob(dest, flags, glob_target); |
| 1976 | if (gr != 0) return 1; |
| 1977 | |
| 1978 | b_reset(dest); |
| 1979 | if (ctx->pending_redirect) { |
| 1980 | ctx->pending_redirect=NULL; |
| 1981 | if (glob_target->gl_pathc != 1) { |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 1982 | error_msg("ambiguous redirect"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 1983 | return 1; |
| 1984 | } |
| 1985 | } else { |
| 1986 | child->argv = glob_target->gl_pathv; |
| 1987 | } |
| 1988 | return 0; |
| 1989 | } |
| 1990 | |
| 1991 | /* The only possible error here is out of memory, in which case |
| 1992 | * xmalloc exits. */ |
| 1993 | static int done_command(struct p_context *ctx) |
| 1994 | { |
| 1995 | /* The child is really already in the pipe structure, so |
| 1996 | * advance the pipe counter and make a new, null child. |
| 1997 | * Only real trickiness here is that the uncommitted |
| 1998 | * child structure, to which ctx->child points, is not |
| 1999 | * counted in pi->num_progs. */ |
| 2000 | struct pipe *pi=ctx->pipe; |
| 2001 | struct child_prog *prog=ctx->child; |
| 2002 | |
| 2003 | if (prog && prog->group == NULL |
| 2004 | && prog->argv == NULL |
| 2005 | && prog->redirects == NULL) { |
| 2006 | debug_printf("done_command: skipping null command\n"); |
| 2007 | return 0; |
| 2008 | } else if (prog) { |
| 2009 | pi->num_progs++; |
| 2010 | debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); |
| 2011 | } else { |
| 2012 | debug_printf("done_command: initializing\n"); |
| 2013 | } |
| 2014 | pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); |
| 2015 | |
| 2016 | prog = pi->progs + pi->num_progs; |
| 2017 | prog->redirects = NULL; |
| 2018 | prog->argv = NULL; |
| 2019 | prog->is_stopped = 0; |
| 2020 | prog->group = NULL; |
| 2021 | prog->glob_result.gl_pathv = NULL; |
| 2022 | prog->family = pi; |
| 2023 | |
| 2024 | ctx->child=prog; |
| 2025 | /* but ctx->pipe and ctx->list_head remain unchanged */ |
| 2026 | return 0; |
| 2027 | } |
| 2028 | |
| 2029 | static int done_pipe(struct p_context *ctx, pipe_style type) |
| 2030 | { |
| 2031 | struct pipe *new_p; |
| 2032 | done_command(ctx); /* implicit closure of previous command */ |
| 2033 | debug_printf("done_pipe, type %d\n", type); |
| 2034 | ctx->pipe->followup = type; |
| 2035 | ctx->pipe->r_mode = ctx->w; |
| 2036 | new_p=new_pipe(); |
| 2037 | ctx->pipe->next = new_p; |
| 2038 | ctx->pipe = new_p; |
| 2039 | ctx->child = NULL; |
| 2040 | done_command(ctx); /* set up new pipe to accept commands */ |
| 2041 | return 0; |
| 2042 | } |
| 2043 | |
| 2044 | /* peek ahead in the in_str to find out if we have a "&n" construct, |
| 2045 | * as in "2>&1", that represents duplicating a file descriptor. |
| 2046 | * returns either -2 (syntax error), -1 (no &), or the number found. |
| 2047 | */ |
| 2048 | static int redirect_dup_num(struct in_str *input) |
| 2049 | { |
| 2050 | int ch, d=0, ok=0; |
| 2051 | ch = b_peek(input); |
| 2052 | if (ch != '&') return -1; |
| 2053 | |
| 2054 | b_getch(input); /* get the & */ |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 2055 | ch=b_peek(input); |
| 2056 | if (ch == '-') { |
| 2057 | b_getch(input); |
| 2058 | return -3; /* "-" represents "close me" */ |
| 2059 | } |
| 2060 | while (isdigit(ch)) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2061 | d = d*10+(ch-'0'); |
| 2062 | ok=1; |
| 2063 | b_getch(input); |
Eric Andersen | 83a2ae2 | 2001-05-07 17:59:25 +0000 | [diff] [blame] | 2064 | ch = b_peek(input); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2065 | } |
| 2066 | if (ok) return d; |
| 2067 | |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 2068 | error_msg("ambiguous redirect"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2069 | return -2; |
| 2070 | } |
| 2071 | |
| 2072 | /* If a redirect is immediately preceded by a number, that number is |
| 2073 | * supposed to tell which file descriptor to redirect. This routine |
| 2074 | * looks for such preceding numbers. In an ideal world this routine |
| 2075 | * needs to handle all the following classes of redirects... |
| 2076 | * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo |
| 2077 | * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo |
| 2078 | * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo |
| 2079 | * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo |
| 2080 | * A -1 output from this program means no valid number was found, so the |
| 2081 | * caller should use the appropriate default for this redirection. |
| 2082 | */ |
| 2083 | static int redirect_opt_num(o_string *o) |
| 2084 | { |
| 2085 | int num; |
| 2086 | |
| 2087 | if (o->length==0) return -1; |
| 2088 | for(num=0; num<o->length; num++) { |
| 2089 | if (!isdigit(*(o->data+num))) { |
| 2090 | return -1; |
| 2091 | } |
| 2092 | } |
| 2093 | /* reuse num (and save an int) */ |
| 2094 | num=atoi(o->data); |
| 2095 | b_reset(o); |
| 2096 | return num; |
| 2097 | } |
| 2098 | |
| 2099 | FILE *generate_stream_from_list(struct pipe *head) |
| 2100 | { |
| 2101 | FILE *pf; |
| 2102 | #if 1 |
| 2103 | int pid, channel[2]; |
| 2104 | if (pipe(channel)<0) perror_msg_and_die("pipe"); |
| 2105 | pid=fork(); |
| 2106 | if (pid<0) { |
| 2107 | perror_msg_and_die("fork"); |
| 2108 | } else if (pid==0) { |
| 2109 | close(channel[0]); |
| 2110 | if (channel[1] != 1) { |
| 2111 | dup2(channel[1],1); |
| 2112 | close(channel[1]); |
| 2113 | } |
| 2114 | #if 0 |
| 2115 | #define SURROGATE "surrogate response" |
| 2116 | write(1,SURROGATE,sizeof(SURROGATE)); |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2117 | _exit(run_list(head)); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2118 | #else |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2119 | _exit(run_list_real(head)); /* leaks memory */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2120 | #endif |
| 2121 | } |
| 2122 | debug_printf("forked child %d\n",pid); |
| 2123 | close(channel[1]); |
| 2124 | pf = fdopen(channel[0],"r"); |
| 2125 | debug_printf("pipe on FILE *%p\n",pf); |
| 2126 | #else |
Eric Andersen | bf7df04 | 2001-05-23 22:18:35 +0000 | [diff] [blame] | 2127 | free_pipe_list(head,0); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2128 | pf=popen("echo surrogate response","r"); |
| 2129 | debug_printf("started fake pipe on FILE *%p\n",pf); |
| 2130 | #endif |
| 2131 | return pf; |
| 2132 | } |
| 2133 | |
| 2134 | /* this version hacked for testing purposes */ |
| 2135 | /* return code is exit status of the process that is run. */ |
| 2136 | static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) |
| 2137 | { |
| 2138 | int retcode; |
| 2139 | o_string result=NULL_O_STRING; |
| 2140 | struct p_context inner; |
| 2141 | FILE *p; |
| 2142 | struct in_str pipe_str; |
| 2143 | initialize_context(&inner); |
| 2144 | |
| 2145 | /* recursion to generate command */ |
| 2146 | retcode = parse_stream(&result, &inner, input, subst_end); |
| 2147 | if (retcode != 0) return retcode; /* syntax error or EOF */ |
| 2148 | done_word(&result, &inner); |
| 2149 | done_pipe(&inner, PIPE_SEQ); |
| 2150 | b_free(&result); |
| 2151 | |
| 2152 | p=generate_stream_from_list(inner.list_head); |
| 2153 | if (p==NULL) return 1; |
| 2154 | mark_open(fileno(p)); |
| 2155 | setup_file_in_str(&pipe_str, p); |
| 2156 | |
| 2157 | /* now send results of command back into original context */ |
| 2158 | retcode = parse_stream(dest, ctx, &pipe_str, '\0'); |
| 2159 | /* XXX In case of a syntax error, should we try to kill the child? |
| 2160 | * That would be tough to do right, so just read until EOF. */ |
| 2161 | if (retcode == 1) { |
| 2162 | while (b_getch(&pipe_str)!=EOF) { /* discard */ }; |
| 2163 | } |
| 2164 | |
| 2165 | debug_printf("done reading from pipe, pclose()ing\n"); |
| 2166 | /* This is the step that wait()s for the child. Should be pretty |
| 2167 | * safe, since we just read an EOF from its stdout. We could try |
| 2168 | * to better, by using wait(), and keeping track of background jobs |
| 2169 | * at the same time. That would be a lot of work, and contrary |
| 2170 | * to the KISS philosophy of this program. */ |
| 2171 | mark_closed(fileno(p)); |
| 2172 | retcode=pclose(p); |
Eric Andersen | a15dc15 | 2001-05-23 23:46:09 +0000 | [diff] [blame] | 2173 | free_pipe_list(inner.list_head,0); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2174 | debug_printf("pclosed, retcode=%d\n",retcode); |
| 2175 | /* XXX this process fails to trim a single trailing newline */ |
| 2176 | return retcode; |
| 2177 | } |
| 2178 | |
| 2179 | static int parse_group(o_string *dest, struct p_context *ctx, |
| 2180 | struct in_str *input, int ch) |
| 2181 | { |
| 2182 | int rcode, endch=0; |
| 2183 | struct p_context sub; |
| 2184 | struct child_prog *child = ctx->child; |
| 2185 | if (child->argv) { |
| 2186 | syntax(); |
| 2187 | return 1; /* syntax error, groups and arglists don't mix */ |
| 2188 | } |
| 2189 | initialize_context(&sub); |
| 2190 | switch(ch) { |
| 2191 | case '(': endch=')'; child->subshell=1; break; |
| 2192 | case '{': endch='}'; break; |
| 2193 | default: syntax(); /* really logic error */ |
| 2194 | } |
| 2195 | rcode=parse_stream(dest,&sub,input,endch); |
| 2196 | done_word(dest,&sub); /* finish off the final word in the subcontext */ |
| 2197 | done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ |
| 2198 | child->group = sub.list_head; |
| 2199 | return rcode; |
| 2200 | /* child remains "open", available for possible redirects */ |
| 2201 | } |
| 2202 | |
| 2203 | /* basically useful version until someone wants to get fancier, |
| 2204 | * see the bash man page under "Parameter Expansion" */ |
| 2205 | static void lookup_param(o_string *dest, struct p_context *ctx, o_string *src) |
| 2206 | { |
| 2207 | const char *p=NULL; |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 2208 | if (src->data) { |
Eric Andersen | f72f562 | 2001-05-15 23:21:41 +0000 | [diff] [blame] | 2209 | p = getenv(src->data); |
| 2210 | if (!p) |
| 2211 | p = get_local_var(src->data); |
Eric Andersen | 20a69a7 | 2001-05-15 17:24:44 +0000 | [diff] [blame] | 2212 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2213 | if (p) parse_string(dest, ctx, p); /* recursion */ |
| 2214 | b_free(src); |
| 2215 | } |
| 2216 | |
| 2217 | /* return code: 0 for OK, 1 for syntax error */ |
| 2218 | static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) |
| 2219 | { |
| 2220 | int i, advance=0; |
| 2221 | o_string alt=NULL_O_STRING; |
| 2222 | char sep[]=" "; |
| 2223 | int ch = input->peek(input); /* first character after the $ */ |
| 2224 | debug_printf("handle_dollar: ch=%c\n",ch); |
| 2225 | if (isalpha(ch)) { |
| 2226 | while(ch=b_peek(input),isalnum(ch) || ch=='_') { |
| 2227 | b_getch(input); |
| 2228 | b_addchr(&alt,ch); |
| 2229 | } |
| 2230 | lookup_param(dest, ctx, &alt); |
| 2231 | } else if (isdigit(ch)) { |
| 2232 | i = ch-'0'; /* XXX is $0 special? */ |
| 2233 | if (i<global_argc) { |
| 2234 | parse_string(dest, ctx, global_argv[i]); /* recursion */ |
| 2235 | } |
| 2236 | advance = 1; |
| 2237 | } else switch (ch) { |
| 2238 | case '$': |
| 2239 | b_adduint(dest,getpid()); |
| 2240 | advance = 1; |
| 2241 | break; |
| 2242 | case '!': |
| 2243 | if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); |
| 2244 | advance = 1; |
| 2245 | break; |
| 2246 | case '?': |
| 2247 | b_adduint(dest,last_return_code); |
| 2248 | advance = 1; |
| 2249 | break; |
| 2250 | case '#': |
| 2251 | b_adduint(dest,global_argc ? global_argc-1 : 0); |
| 2252 | advance = 1; |
| 2253 | break; |
| 2254 | case '{': |
| 2255 | b_getch(input); |
| 2256 | /* XXX maybe someone will try to escape the '}' */ |
| 2257 | while(ch=b_getch(input),ch!=EOF && ch!='}') { |
| 2258 | b_addchr(&alt,ch); |
| 2259 | } |
| 2260 | if (ch != '}') { |
| 2261 | syntax(); |
| 2262 | return 1; |
| 2263 | } |
| 2264 | lookup_param(dest, ctx, &alt); |
| 2265 | break; |
| 2266 | case '(': |
Matt Kraai | 9f8caf1 | 2001-05-02 16:26:12 +0000 | [diff] [blame] | 2267 | b_getch(input); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2268 | process_command_subs(dest, ctx, input, ')'); |
| 2269 | break; |
| 2270 | case '*': |
| 2271 | sep[0]=ifs[0]; |
| 2272 | for (i=1; i<global_argc; i++) { |
| 2273 | parse_string(dest, ctx, global_argv[i]); |
| 2274 | if (i+1 < global_argc) parse_string(dest, ctx, sep); |
| 2275 | } |
| 2276 | break; |
| 2277 | case '@': |
| 2278 | case '-': |
| 2279 | case '_': |
| 2280 | /* still unhandled, but should be eventually */ |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 2281 | error_msg("unhandled syntax: $%c",ch); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2282 | return 1; |
| 2283 | break; |
| 2284 | default: |
| 2285 | b_addqchr(dest,'$',dest->quote); |
| 2286 | } |
| 2287 | /* Eat the character if the flag was set. If the compiler |
| 2288 | * is smart enough, we could substitute "b_getch(input);" |
| 2289 | * for all the "advance = 1;" above, and also end up with |
| 2290 | * a nice size-optimized program. Hah! That'll be the day. |
| 2291 | */ |
| 2292 | if (advance) b_getch(input); |
| 2293 | return 0; |
| 2294 | } |
| 2295 | |
| 2296 | int parse_string(o_string *dest, struct p_context *ctx, const char *src) |
| 2297 | { |
| 2298 | struct in_str foo; |
| 2299 | setup_string_in_str(&foo, src); |
| 2300 | return parse_stream(dest, ctx, &foo, '\0'); |
| 2301 | } |
| 2302 | |
| 2303 | /* return code is 0 for normal exit, 1 for syntax error */ |
| 2304 | int parse_stream(o_string *dest, struct p_context *ctx, |
| 2305 | struct in_str *input, int end_trigger) |
| 2306 | { |
| 2307 | unsigned int ch, m; |
| 2308 | int redir_fd; |
| 2309 | redir_type redir_style; |
| 2310 | int next; |
| 2311 | |
| 2312 | /* Only double-quote state is handled in the state variable dest->quote. |
| 2313 | * A single-quote triggers a bypass of the main loop until its mate is |
| 2314 | * found. When recursing, quote state is passed in via dest->quote. */ |
| 2315 | |
| 2316 | debug_printf("parse_stream, end_trigger=%d\n",end_trigger); |
| 2317 | while ((ch=b_getch(input))!=EOF) { |
| 2318 | m = map[ch]; |
| 2319 | next = (ch == '\n') ? 0 : b_peek(input); |
| 2320 | debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d\n", |
| 2321 | ch,ch,m,dest->quote); |
| 2322 | if (m==0 || ((m==1 || m==2) && dest->quote)) { |
| 2323 | b_addqchr(dest, ch, dest->quote); |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 2324 | } else { |
| 2325 | if (m==2) { /* unquoted IFS */ |
| 2326 | done_word(dest, ctx); |
Matt Kraai | 20a3069 | 2001-05-02 17:52:49 +0000 | [diff] [blame] | 2327 | /* If we aren't performing a substitution, treat a newline as a |
| 2328 | * command separator. */ |
| 2329 | if (end_trigger != '\0' && ch=='\n') |
| 2330 | done_pipe(ctx,PIPE_SEQ); |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 2331 | } |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 2332 | if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 2333 | debug_printf("leaving parse_stream (triggered)\n"); |
Eric Andersen | af44a0e | 2001-04-27 07:26:12 +0000 | [diff] [blame] | 2334 | return 0; |
| 2335 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2336 | #if 0 |
| 2337 | if (ch=='\n') { |
| 2338 | /* Yahoo! Time to run with it! */ |
| 2339 | done_pipe(ctx,PIPE_SEQ); |
| 2340 | run_list(ctx->list_head); |
| 2341 | initialize_context(ctx); |
| 2342 | } |
| 2343 | #endif |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 2344 | if (m!=2) switch (ch) { |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2345 | case '#': |
| 2346 | if (dest->length == 0 && !dest->quote) { |
| 2347 | while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } |
| 2348 | } else { |
| 2349 | b_addqchr(dest, ch, dest->quote); |
| 2350 | } |
| 2351 | break; |
| 2352 | case '\\': |
| 2353 | if (next == EOF) { |
| 2354 | syntax(); |
| 2355 | return 1; |
| 2356 | } |
| 2357 | b_addqchr(dest, '\\', dest->quote); |
| 2358 | b_addqchr(dest, b_getch(input), dest->quote); |
| 2359 | break; |
| 2360 | case '$': |
| 2361 | if (handle_dollar(dest, ctx, input)!=0) return 1; |
| 2362 | break; |
| 2363 | case '\'': |
| 2364 | dest->nonnull = 1; |
| 2365 | while(ch=b_getch(input),ch!=EOF && ch!='\'') { |
| 2366 | b_addchr(dest,ch); |
| 2367 | } |
| 2368 | if (ch==EOF) { |
| 2369 | syntax(); |
| 2370 | return 1; |
| 2371 | } |
| 2372 | break; |
| 2373 | case '"': |
| 2374 | dest->nonnull = 1; |
| 2375 | dest->quote = !dest->quote; |
| 2376 | break; |
| 2377 | case '`': |
| 2378 | process_command_subs(dest, ctx, input, '`'); |
| 2379 | break; |
| 2380 | case '>': |
| 2381 | redir_fd = redirect_opt_num(dest); |
| 2382 | done_word(dest, ctx); |
| 2383 | redir_style=REDIRECT_OVERWRITE; |
| 2384 | if (next == '>') { |
| 2385 | redir_style=REDIRECT_APPEND; |
| 2386 | b_getch(input); |
| 2387 | } else if (next == '(') { |
| 2388 | syntax(); /* until we support >(list) Process Substitution */ |
| 2389 | return 1; |
| 2390 | } |
| 2391 | setup_redirect(ctx, redir_fd, redir_style, input); |
| 2392 | break; |
| 2393 | case '<': |
| 2394 | redir_fd = redirect_opt_num(dest); |
| 2395 | done_word(dest, ctx); |
| 2396 | redir_style=REDIRECT_INPUT; |
| 2397 | if (next == '<') { |
| 2398 | redir_style=REDIRECT_HEREIS; |
| 2399 | b_getch(input); |
| 2400 | } else if (next == '>') { |
| 2401 | redir_style=REDIRECT_IO; |
| 2402 | b_getch(input); |
| 2403 | } else if (next == '(') { |
| 2404 | syntax(); /* until we support <(list) Process Substitution */ |
| 2405 | return 1; |
| 2406 | } |
| 2407 | setup_redirect(ctx, redir_fd, redir_style, input); |
| 2408 | break; |
| 2409 | case ';': |
| 2410 | done_word(dest, ctx); |
| 2411 | done_pipe(ctx,PIPE_SEQ); |
| 2412 | break; |
| 2413 | case '&': |
| 2414 | done_word(dest, ctx); |
| 2415 | if (next=='&') { |
| 2416 | b_getch(input); |
| 2417 | done_pipe(ctx,PIPE_AND); |
| 2418 | } else { |
| 2419 | done_pipe(ctx,PIPE_BG); |
| 2420 | } |
| 2421 | break; |
| 2422 | case '|': |
| 2423 | done_word(dest, ctx); |
| 2424 | if (next=='|') { |
| 2425 | b_getch(input); |
| 2426 | done_pipe(ctx,PIPE_OR); |
| 2427 | } else { |
| 2428 | /* we could pick up a file descriptor choice here |
| 2429 | * with redirect_opt_num(), but bash doesn't do it. |
| 2430 | * "echo foo 2| cat" yields "foo 2". */ |
| 2431 | done_command(ctx); |
| 2432 | } |
| 2433 | break; |
| 2434 | case '(': |
| 2435 | case '{': |
| 2436 | if (parse_group(dest, ctx, input, ch)!=0) return 1; |
| 2437 | break; |
| 2438 | case ')': |
| 2439 | case '}': |
| 2440 | syntax(); /* Proper use of this character caught by end_trigger */ |
| 2441 | return 1; |
| 2442 | break; |
| 2443 | default: |
| 2444 | syntax(); /* this is really an internal logic error */ |
| 2445 | return 1; |
Eric Andersen | aac75e5 | 2001-04-30 18:18:45 +0000 | [diff] [blame] | 2446 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2447 | } |
| 2448 | } |
| 2449 | /* complain if quote? No, maybe we just finished a command substitution |
| 2450 | * that was quoted. Example: |
| 2451 | * $ echo "`cat foo` plus more" |
| 2452 | * and we just got the EOF generated by the subshell that ran "cat foo" |
| 2453 | * The only real complaint is if we got an EOF when end_trigger != '\0', |
| 2454 | * that is, we were really supposed to get end_trigger, and never got |
| 2455 | * one before the EOF. Can't use the standard "syntax error" return code, |
| 2456 | * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ |
Matt Kraai | bdd4ece | 2001-05-23 17:43:00 +0000 | [diff] [blame] | 2457 | debug_printf("leaving parse_stream (EOF)\n"); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2458 | if (end_trigger != '\0') return -1; |
| 2459 | return 0; |
| 2460 | } |
| 2461 | |
| 2462 | void mapset(const unsigned char *set, int code) |
| 2463 | { |
| 2464 | const unsigned char *s; |
| 2465 | for (s=set; *s; s++) map[*s] = code; |
| 2466 | } |
| 2467 | |
| 2468 | void update_ifs_map(void) |
| 2469 | { |
| 2470 | /* char *ifs and char map[256] are both globals. */ |
| 2471 | ifs = getenv("IFS"); |
| 2472 | if (ifs == NULL) ifs=" \t\n"; |
| 2473 | /* Precompute a list of 'flow through' behavior so it can be treated |
| 2474 | * quickly up front. Computation is necessary because of IFS. |
| 2475 | * Special case handling of IFS == " \t\n" is not implemented. |
| 2476 | * The map[] array only really needs two bits each, and on most machines |
| 2477 | * that would be faster because of the reduced L1 cache footprint. |
| 2478 | */ |
Eric Andersen | aeb44c4 | 2001-05-22 20:29:00 +0000 | [diff] [blame] | 2479 | memset(map,0,sizeof(map)); /* most characters flow through always */ |
| 2480 | mapset("\\$'\"`", 3); /* never flow through */ |
| 2481 | mapset("<>;&|(){}#", 1); /* flow through if quoted */ |
| 2482 | mapset(ifs, 2); /* also flow through if quoted */ |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2483 | } |
| 2484 | |
| 2485 | /* most recursion does not come through here, the exeception is |
| 2486 | * from builtin_source() */ |
| 2487 | int parse_stream_outer(struct in_str *inp) |
| 2488 | { |
| 2489 | |
| 2490 | struct p_context ctx; |
| 2491 | o_string temp=NULL_O_STRING; |
| 2492 | int rcode; |
| 2493 | do { |
| 2494 | initialize_context(&ctx); |
| 2495 | update_ifs_map(); |
| 2496 | inp->promptmode=1; |
| 2497 | rcode = parse_stream(&temp, &ctx, inp, '\n'); |
| 2498 | done_word(&temp, &ctx); |
| 2499 | done_pipe(&ctx,PIPE_SEQ); |
| 2500 | run_list(ctx.list_head); |
Eric Andersen | a813afc | 2001-05-24 16:19:36 +0000 | [diff] [blame] | 2501 | b_free(&temp); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2502 | } while (rcode != -1); /* loop on syntax errors, return on EOF */ |
| 2503 | return 0; |
| 2504 | } |
| 2505 | |
| 2506 | static int parse_string_outer(const char *s) |
| 2507 | { |
| 2508 | struct in_str input; |
| 2509 | setup_string_in_str(&input, s); |
| 2510 | return parse_stream_outer(&input); |
| 2511 | } |
| 2512 | |
| 2513 | static int parse_file_outer(FILE *f) |
| 2514 | { |
| 2515 | int rcode; |
| 2516 | struct in_str input; |
| 2517 | setup_file_in_str(&input, f); |
| 2518 | rcode = parse_stream_outer(&input); |
| 2519 | return rcode; |
| 2520 | } |
| 2521 | |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 2522 | |
| 2523 | /* I think Erik wrote this. It looks imperfect at best */ |
| 2524 | void grab_tty_control(void) |
| 2525 | { |
| 2526 | pid_t initialpgrp; |
| 2527 | do { |
| 2528 | initialpgrp = tcgetpgrp(fileno(stderr)); |
| 2529 | if (initialpgrp < 0) { |
| 2530 | error_msg("sh: can't access tty; job control disabled\n"); |
| 2531 | } |
| 2532 | if (initialpgrp == -1) |
| 2533 | initialpgrp = getpgrp(); |
| 2534 | else if (initialpgrp != getpgrp()) { |
| 2535 | killpg(initialpgrp, SIGTTIN); |
| 2536 | continue; |
| 2537 | } |
| 2538 | } while (0); |
| 2539 | } |
| 2540 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2541 | int shell_main(int argc, char **argv) |
| 2542 | { |
| 2543 | int opt; |
| 2544 | FILE *input; |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 2545 | struct jobset joblist_end = { NULL, NULL }; |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 2546 | char **e = environ; |
Eric Andersen | bc604a2 | 2001-05-16 05:24:03 +0000 | [diff] [blame] | 2547 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2548 | /* XXX what should these be while sourcing /etc/profile? */ |
| 2549 | global_argc = argc; |
| 2550 | global_argv = argv; |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2551 | |
| 2552 | /* (re?) initialize globals. Sometimes shell_main() ends up calling |
| 2553 | * shell_main(), therefore we cannot rely on the BSS to zero out this |
| 2554 | * stuff. Reset these to 0 every time. */ |
| 2555 | ifs = NULL; |
Eric Andersen | aeb44c4 | 2001-05-22 20:29:00 +0000 | [diff] [blame] | 2556 | /* map[] is taken care of with call to update_ifs_map() */ |
Eric Andersen | 94ac244 | 2001-05-22 19:05:18 +0000 | [diff] [blame] | 2557 | fake_mode = 0; |
| 2558 | interactive = 0; |
| 2559 | close_me_head = NULL; |
| 2560 | last_bg_pid = 0; |
| 2561 | |
| 2562 | /* Initialize some more globals to non-zero values */ |
| 2563 | set_cwd(); |
| 2564 | job_list = &joblist_end; |
| 2565 | #ifdef BB_FEATURE_COMMAND_EDITING |
| 2566 | cmdedit_set_initial_prompt(); |
| 2567 | #else |
| 2568 | PS1 = NULL; |
| 2569 | #endif |
| 2570 | PS2 = "> "; |
| 2571 | |
| 2572 | /* initialize our shell local variables with the values |
| 2573 | * currently living in the environment */ |
| 2574 | if (e) { |
| 2575 | for (; *e; e++) |
| 2576 | set_local_var(*e, 2); /* without call putenv() */ |
| 2577 | } |
| 2578 | |
| 2579 | last_return_code=EXIT_SUCCESS; |
| 2580 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2581 | |
Eric Andersen | bfae252 | 2001-05-17 00:14:27 +0000 | [diff] [blame] | 2582 | /* If we get started under a job aware app (like bash |
| 2583 | * for example), make sure we are now in charge so we |
| 2584 | * don't fight over who gets the foreground */ |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 2585 | /* don't pay any attention to this signal; it just confuses |
| 2586 | things and isn't really meant for shells anyway */ |
| 2587 | signal(SIGTTOU, SIG_IGN); |
Eric Andersen | bfae252 | 2001-05-17 00:14:27 +0000 | [diff] [blame] | 2588 | setpgid(0, getpid()); |
| 2589 | tcsetpgrp(fileno(stderr), getpid()); |
Eric Andersen | bafd94f | 2001-05-02 16:11:59 +0000 | [diff] [blame] | 2590 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2591 | if (argv[0] && argv[0][0] == '-') { |
| 2592 | debug_printf("\nsourcing /etc/profile\n"); |
| 2593 | input = xfopen("/etc/profile", "r"); |
| 2594 | mark_open(fileno(input)); |
| 2595 | parse_file_outer(input); |
| 2596 | mark_closed(fileno(input)); |
| 2597 | fclose(input); |
| 2598 | } |
| 2599 | input=stdin; |
| 2600 | |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2601 | while ((opt = getopt(argc, argv, "c:xif")) > 0) { |
| 2602 | switch (opt) { |
| 2603 | case 'c': |
| 2604 | { |
| 2605 | global_argv = argv+optind; |
| 2606 | global_argc = argc-optind; |
| 2607 | opt = parse_string_outer(optarg); |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 2608 | goto final_return; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2609 | } |
| 2610 | break; |
| 2611 | case 'i': |
| 2612 | interactive++; |
| 2613 | break; |
| 2614 | case 'f': |
| 2615 | fake_mode++; |
| 2616 | break; |
| 2617 | default: |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 2618 | #ifndef BB_VER |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2619 | fprintf(stderr, "Usage: sh [FILE]...\n" |
| 2620 | " or: sh -c command [args]...\n\n"); |
| 2621 | exit(EXIT_FAILURE); |
Eric Andersen | 9ffb7dd | 2001-05-19 03:00:46 +0000 | [diff] [blame] | 2622 | #else |
| 2623 | show_usage(); |
| 2624 | #endif |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2625 | } |
| 2626 | } |
| 2627 | /* A shell is interactive if the `-i' flag was given, or if all of |
| 2628 | * the following conditions are met: |
| 2629 | * no -c command |
| 2630 | * no arguments remaining or the -s flag given |
| 2631 | * standard input is a terminal |
| 2632 | * standard output is a terminal |
| 2633 | * Refer to Posix.2, the description of the `sh' utility. */ |
| 2634 | if (argv[optind]==NULL && input==stdin && |
| 2635 | isatty(fileno(stdin)) && isatty(fileno(stdout))) { |
| 2636 | interactive++; |
| 2637 | } |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 2638 | |
| 2639 | debug_printf("\ninteractive=%d\n", interactive); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2640 | if (interactive) { |
| 2641 | /* Looks like they want an interactive shell */ |
| 2642 | fprintf(stdout, "\nhush -- the humble shell v0.01 (testing)\n\n"); |
Eric Andersen | ada18ff | 2001-05-21 16:18:22 +0000 | [diff] [blame] | 2643 | grab_tty_control(); |
| 2644 | } |
| 2645 | if (argv[optind]==NULL) { |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 2646 | opt=parse_file_outer(stdin); |
| 2647 | goto final_return; |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2648 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2649 | |
| 2650 | debug_printf("\nrunning script '%s'\n", argv[optind]); |
| 2651 | global_argv = argv+optind; |
| 2652 | global_argc = argc-optind; |
| 2653 | input = xfopen(argv[optind], "r"); |
| 2654 | opt = parse_file_outer(input); |
| 2655 | |
| 2656 | #ifdef BB_FEATURE_CLEAN_UP |
Eric Andersen | aeb44c4 | 2001-05-22 20:29:00 +0000 | [diff] [blame] | 2657 | fclose(input); |
| 2658 | if (cwd && cwd != unknown) |
| 2659 | free((char*)cwd); |
| 2660 | { |
| 2661 | struct variables *cur, *tmp; |
| 2662 | for(cur = top_vars; cur; cur = tmp) { |
| 2663 | tmp = cur->next; |
| 2664 | if (!cur->flg_read_only) { |
| 2665 | free(cur->name); |
| 2666 | free(cur->value); |
| 2667 | free(cur); |
| 2668 | } |
| 2669 | } |
| 2670 | } |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2671 | #endif |
| 2672 | |
Eric Andersen | e67c3ce | 2001-05-02 02:09:36 +0000 | [diff] [blame] | 2673 | final_return: |
| 2674 | return(opt?opt:last_return_code); |
Eric Andersen | 25f2703 | 2001-04-26 23:22:31 +0000 | [diff] [blame] | 2675 | } |