| /* vi: set sw=4 ts=4: */ |
| /* |
| * lash -- the BusyBox Lame-Ass SHell |
| * |
| * Copyright (C) 1999,2000,2001 by Lineo, inc. |
| * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> |
| * |
| * Based in part on ladsh.c by Michael K. Johnson and Erik W. Troan, which is |
| * under the following liberal license: "We have placed this source code in the |
| * public domain. Use it in any project, free or commercial." |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| /* The parsing engine of this program is officially at a dead-end. |
| * Future work in that direction should move to the work posted |
| * at http://doolittle.faludi.com/~larry/parser.html . |
| * A start on the integration of that work with the rest of sh.c |
| * is at http://codepoet.org/sh.c . |
| */ |
| // |
| //This works pretty well now, and is now on by default. |
| #define BB_FEATURE_SH_ENVIRONMENT |
| // |
| //Backtick support has some problems, use at your own risk! |
| //#define BB_FEATURE_SH_BACKTICKS |
| // |
| //If, then, else, etc. support.. This should now behave basically |
| //like any other Bourne shell... |
| #define BB_FEATURE_SH_IF_EXPRESSIONS |
| // |
| /* This is currently a little broken... */ |
| //#define HANDLE_CONTINUATION_CHARS |
| // |
| //For debugging/development on the shell only... |
| //#define DEBUG_SHELL |
| |
| |
| #include "busybox.h" |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <ctype.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <glob.h> |
| #include <signal.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| #include <getopt.h> |
| #include "cmdedit.h" |
| |
| static const int MAX_LINE = 256; /* size of input buffer for cwd data */ |
| static const int MAX_READ = 128; /* size of input buffer for `read' builtin */ |
| #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" |
| |
| |
| enum redir_type { REDIRECT_INPUT, REDIRECT_OVERWRITE, |
| REDIRECT_APPEND |
| }; |
| |
| static const unsigned int DEFAULT_CONTEXT=0x1; |
| static const unsigned int IF_TRUE_CONTEXT=0x2; |
| static const unsigned int IF_FALSE_CONTEXT=0x4; |
| static const unsigned int THEN_EXP_CONTEXT=0x8; |
| static const unsigned int ELSE_EXP_CONTEXT=0x10; |
| |
| |
| struct jobset { |
| struct job *head; /* head of list of running jobs */ |
| struct job *fg; /* current foreground job */ |
| }; |
| |
| struct redir_struct { |
| enum redir_type type; /* type of redirection */ |
| int fd; /* file descriptor being redirected */ |
| char *filename; /* file to redirect fd to */ |
| }; |
| |
| struct child_prog { |
| pid_t pid; /* 0 if exited */ |
| char **argv; /* program name and arguments */ |
| int num_redirects; /* elements in redirection array */ |
| struct redir_struct *redirects; /* I/O redirects */ |
| glob_t glob_result; /* result of parameter globbing */ |
| int free_glob; /* should we globfree(&glob_result)? */ |
| int is_stopped; /* is the program currently running? */ |
| struct job *family; /* pointer back to the child's parent job */ |
| }; |
| |
| struct job { |
| int jobid; /* job number */ |
| int num_progs; /* total number of programs in job */ |
| int running_progs; /* number of programs running */ |
| char *text; /* name of job */ |
| char *cmdbuf; /* buffer various argv's point into */ |
| pid_t pgrp; /* process group ID for the job */ |
| struct child_prog *progs; /* array of programs in job */ |
| struct job *next; /* to track background commands */ |
| int stopped_progs; /* number of programs alive, but stopped */ |
| unsigned int job_context; /* bitmask defining current context */ |
| struct jobset *job_list; |
| }; |
| |
| struct built_in_command { |
| char *cmd; /* name */ |
| char *descr; /* description */ |
| int (*function) (struct child_prog *); /* function ptr */ |
| }; |
| |
| struct close_me { |
| int fd; |
| struct close_me *next; |
| }; |
| |
| /* function prototypes for builtins */ |
| static int builtin_cd(struct child_prog *cmd); |
| static int builtin_env(struct child_prog *dummy); |
| static int builtin_exec(struct child_prog *cmd); |
| static int builtin_exit(struct child_prog *cmd); |
| static int builtin_fg_bg(struct child_prog *cmd); |
| static int builtin_help(struct child_prog *cmd); |
| static int builtin_jobs(struct child_prog *dummy); |
| static int builtin_pwd(struct child_prog *dummy); |
| static int builtin_export(struct child_prog *cmd); |
| static int builtin_source(struct child_prog *cmd); |
| static int builtin_unset(struct child_prog *cmd); |
| static int builtin_read(struct child_prog *cmd); |
| #ifdef BB_FEATURE_SH_IF_EXPRESSIONS |
| static int builtin_if(struct child_prog *cmd); |
| static int builtin_then(struct child_prog *cmd); |
| static int builtin_else(struct child_prog *cmd); |
| static int builtin_fi(struct child_prog *cmd); |
| /* function prototypes for shell stuff */ |
| static int run_command_predicate(char *cmd); |
| #endif |
| |
| |
| /* function prototypes for shell stuff */ |
| static void mark_open(int fd); |
| static void mark_closed(int fd); |
| static void checkjobs(struct jobset *job_list); |
| static int get_command(FILE * source, char *command); |
| static int parse_command(char **command_ptr, struct job *job, int *inbg); |
| static int run_command(struct job *newjob, int inbg, int outpipe[2]); |
| static int pseudo_exec(struct child_prog *cmd) __attribute__ ((noreturn)); |
| static int busy_loop(FILE * input); |
| |
| |
| /* Table of built-in functions (these are non-forking builtins, meaning they |
| * can change global variables in the parent shell process but they will not |
| * work with pipes and redirects; 'unset foo | whatever' will not work) */ |
| static struct built_in_command bltins[] = { |
| {"bg", "Resume a job in the background", builtin_fg_bg}, |
| {"cd", "Change working directory", builtin_cd}, |
| {"exec", "Exec command, replacing this shell with the exec'd process", builtin_exec}, |
| {"exit", "Exit from shell()", builtin_exit}, |
| {"fg", "Bring job into the foreground", builtin_fg_bg}, |
| {"jobs", "Lists the active jobs", builtin_jobs}, |
| {"export", "Set environment variable", builtin_export}, |
| {"unset", "Unset environment variable", builtin_unset}, |
| {"read", "Input environment variable", builtin_read}, |
| {".", "Source-in and run commands in a file", builtin_source}, |
| /* to do: add ulimit */ |
| #ifdef BB_FEATURE_SH_IF_EXPRESSIONS |
| {"if", NULL, builtin_if}, |
| {"then", NULL, builtin_then}, |
| {"else", NULL, builtin_else}, |
| {"fi", NULL, builtin_fi}, |
| #endif |
| {NULL, NULL, NULL} |
| }; |
| |
| /* Table of forking built-in functions (things that fork cannot change global |
| * variables in the parent process, such as the current working directory) */ |
| static struct built_in_command bltins_forking[] = { |
| {"env", "Print all environment variables", builtin_env}, |
| {"pwd", "Print current directory", builtin_pwd}, |
| {"help", "List shell built-in commands", builtin_help}, |
| {NULL, NULL, NULL} |
| }; |
| |
| |
| /* Variables we export */ |
| unsigned int shell_context; /* Used in cmdedit.c to reset the |
| context when someone hits ^C */ |
| |
| |
| /* Globals that are static to this file */ |
| static char *cwd; |
| static char *local_pending_command = NULL; |
| static struct jobset job_list = { NULL, NULL }; |
| static int argc; |
| static char **argv; |
| static struct close_me *close_me_head = NULL; |
| #ifdef BB_FEATURE_SH_ENVIRONMENT |
| static int last_bg_pid=-1; |
| static int last_return_code=-1; |
| static int show_x_trace=FALSE; |
| #endif |
| #ifdef BB_FEATURE_SH_IF_EXPRESSIONS |
| static char syntax_err[]="syntax error near unexpected token"; |
| #endif |
| |
| #ifdef DEBUG_SHELL |
| static inline void debug_printf(const char *format, ...) |
| { |
| va_list args; |
| va_start(args, format); |
| vfprintf(stderr, format, args); |
| va_end(args); |
| } |
| #else |
| static inline void debug_printf(const char *format, ...) { } |
| #endif |
| |
| /* |
| Most builtins need access to the struct child_prog that has |
| their arguments, previously coded as cmd->progs[0]. That coding |
| can exhibit a bug, if the builtin is not the first command in |
| a pipeline: "echo foo | exec sort" will attempt to exec foo. |
| |
| builtin previous use notes |
| ------ ----------------- --------- |
| cd cmd->progs[0] |
| env 0 |
| exec cmd->progs[0] squashed bug: didn't look for applets or forking builtins |
| exit cmd->progs[0] |
| fg_bg cmd->progs[0], job_list->head, job_list->fg |
| help 0 |
| jobs job_list->head |
| pwd 0 |
| export cmd->progs[0] passes cmd, job_list to builtin_env(), which ignores them |
| source cmd->progs[0] |
| unset cmd->progs[0] |
| read cmd->progs[0] |
| if cmd->job_context, cmd->text |
| then cmd->job_context, cmd->text |
| else cmd->job_context, cmd->text |
| fi cmd->job_context |
| |
| The use of cmd->text by if/then/else/fi is hopelessly hacky. |
| Would it work to increment cmd->progs[0]->argv and recurse, |
| somewhat like builtin_exec does? |
| |
| I added "struct job *family;" to struct child_prog, |
| and switched API to builtin_foo(struct child_prog *child); |
| So cmd->text becomes child->family->text |
| cmd->job_context becomes child->family->job_context |
| cmd->progs[0] becomes *child |
| job_list becomes child->family->job_list |
| */ |
| |
| /* built-in 'cd <path>' handler */ |
| static int builtin_cd(struct child_prog *child) |
| { |
| char *newdir; |
| |
| if (child->argv[1] == NULL) |
| newdir = getenv("HOME"); |
| else |
| newdir = child->argv[1]; |
| if (chdir(newdir)) { |
| printf("cd: %s: %s\n", newdir, strerror(errno)); |
| return EXIT_FAILURE; |
| } |
| getcwd(cwd, sizeof(char)*MAX_LINE); |
| |
| return EXIT_SUCCESS; |
| } |
| |
| /* built-in 'env' handler */ |
| static int builtin_env(struct child_prog *dummy) |
| { |
| char **e; |
| |
| for (e = environ; *e; e++) { |
| printf( "%s\n", *e); |
| } |
| return (0); |
| } |
| |
| /* built-in 'exec' handler */ |
| static int builtin_exec(struct child_prog *child) |
| { |
| if (child->argv[1] == NULL) |
| return EXIT_SUCCESS; /* Really? */ |
| child->argv++; |
| pseudo_exec(child); |
| /* never returns */ |
| } |
| |
| /* built-in 'exit' handler */ |
| static int builtin_exit(struct child_prog *child) |
| { |
| if (child->argv[1] == NULL) |
| exit(EXIT_SUCCESS); |
| |
| exit (atoi(child->argv[1])); |
| } |
| |
| /* built-in 'fg' and 'bg' handler */ |
| static int builtin_fg_bg(struct child_prog *child) |
| { |
| int i, jobNum; |
| struct job *job=NULL; |
| |
| if (!child->argv[1] || child->argv[2]) { |
| error_msg("%s: exactly one argument is expected", |
| child->argv[0]); |
| return EXIT_FAILURE; |
| } |
| |
| if (sscanf(child->argv[1], "%%%d", &jobNum) != 1) { |
| error_msg("%s: bad argument '%s'", |
| child->argv[0], child->argv[1]); |
| return EXIT_FAILURE; |
| } |
| |
| for (job = child->family->job_list->head; job; job = job->next) { |
| if (job->jobid == jobNum) { |
| break; |
| } |
| } |
| |
| if (!job) { |
| error_msg("%s: unknown job %d", |
| child->argv[0], jobNum); |
| return EXIT_FAILURE; |
| } |
| |
| if (*child->argv[0] == 'f') { |
| /* Make this job the foreground job */ |
| /* suppress messages when run from /linuxrc mag@sysgo.de */ |
| if (tcsetpgrp(0, job->pgrp) && errno != ENOTTY) |
| perror_msg("tcsetpgrp"); |
| child->family->job_list->fg = job; |
| } |
| |
| /* Restart the processes in the job */ |
| for (i = 0; i < job->num_progs; i++) |
| job->progs[i].is_stopped = 0; |
| |
| kill(-job->pgrp, SIGCONT); |
| |
| job->stopped_progs = 0; |
| |
| return EXIT_SUCCESS; |
| } |
| |
| /* built-in 'help' handler */ |
| static int builtin_help(struct child_prog *dummy) |
| { |
| struct built_in_command *x; |
| |
| printf("\nBuilt-in commands:\n"); |
| printf("-------------------\n"); |
| for (x = bltins; x->cmd; x++) { |
| if (x->descr==NULL) |
| continue; |
| printf("%s\t%s\n", x->cmd, x->descr); |
| } |
| for (x = bltins_forking; x->cmd; x++) { |
| if (x->descr==NULL) |
| continue; |
| printf("%s\t%s\n", x->cmd, x->descr); |
| } |
| printf("\n\n"); |
| return EXIT_SUCCESS; |
| } |
| |
| /* built-in 'jobs' handler */ |
| static int builtin_jobs(struct child_prog *child) |
| { |
| struct job *job; |
| char *status_string; |
| |
| for (job = child->family->job_list->head; job; job = job->next) { |
| if (job->running_progs == job->stopped_progs) |
| status_string = "Stopped"; |
| else |
| status_string = "Running"; |
| |
| printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); |
| } |
| return EXIT_SUCCESS; |
| } |
| |
| |
| /* built-in 'pwd' handler */ |
| static int builtin_pwd(struct child_prog *dummy) |
| { |
| getcwd(cwd, MAX_LINE); |
| printf( "%s\n", cwd); |
| return EXIT_SUCCESS; |
| } |
| |
| /* built-in 'export VAR=value' handler */ |
| static int builtin_export(struct child_prog *child) |
| { |
| int res; |
| |
| if (child->argv[1] == NULL) { |
| return (builtin_env(child)); |
| } |
| res = putenv(child->argv[1]); |
| if (res) |
| fprintf(stderr, "export: %s\n", strerror(errno)); |
| return (res); |
| } |
| |
| /* built-in 'read VAR' handler */ |
| static int builtin_read(struct child_prog *child) |
| { |
| int res = 0, len, newlen; |
| char *s; |
| char string[MAX_READ]; |
| |
| if (child->argv[1]) { |
| /* argument (VAR) given: put "VAR=" into buffer */ |
| strcpy(string, child->argv[1]); |
| len = strlen(string); |
| string[len++] = '='; |
| string[len] = '\0'; |
| fgets(&string[len], sizeof(string) - len, stdin); /* read string */ |
| newlen = strlen(string); |
| if(newlen > len) |
| string[--newlen] = '\0'; /* chomp trailing newline */ |
| /* |
| ** string should now contain "VAR=<value>" |
| ** copy it (putenv() won't do that, so we must make sure |
| ** the string resides in a static buffer!) |
| */ |
| res = -1; |
| if((s = strdup(string))) |
| res = putenv(s); |
| if (res) |
| fprintf(stderr, "read: %s\n", strerror(errno)); |
| } |
| else |
| fgets(string, sizeof(string), stdin); |
| |
| return (res); |
| } |
| |
| #ifdef BB_FEATURE_SH_IF_EXPRESSIONS |
| /* Built-in handler for 'if' commands */ |
| static int builtin_if(struct child_prog *child) |
| { |
| struct job *cmd = child->family; |
| int status; |
| char* charptr1=cmd->text+3; /* skip over the leading 'if ' */ |
| |
| /* Now run the 'if' command */ |
| debug_printf( "job=%p entering builtin_if ('%s')-- context=%d\n", cmd, charptr1, cmd->job_context); |
| status = run_command_predicate(charptr1); |
| debug_printf( "if test returned "); |
| if (status == 0) { |
| debug_printf( "TRUE\n"); |
| cmd->job_context |= IF_TRUE_CONTEXT; |
| } else { |
| debug_printf( "FALSE\n"); |
| cmd->job_context |= IF_FALSE_CONTEXT; |
| } |
| debug_printf("job=%p builtin_if set job context to %x\n", cmd, cmd->job_context); |
| shell_context++; |
| |
| return status; |
| } |
| |
| /* Built-in handler for 'then' (part of the 'if' command) */ |
| static int builtin_then(struct child_prog *child) |
| { |
| struct job *cmd = child->family; |
| char* charptr1=cmd->text+5; /* skip over the leading 'then ' */ |
| |
| debug_printf( "job=%p entering builtin_then ('%s')-- context=%d\n", cmd, charptr1, cmd->job_context); |
| if (! (cmd->job_context & (IF_TRUE_CONTEXT|IF_FALSE_CONTEXT))) { |
| shell_context = 0; /* Reset the shell's context on an error */ |
| error_msg("%s `then'", syntax_err); |
| return EXIT_FAILURE; |
| } |
| |
| cmd->job_context |= THEN_EXP_CONTEXT; |
| debug_printf("job=%p builtin_then set job context to %x\n", cmd, cmd->job_context); |
| |
| /* If the if result was FALSE, skip the 'then' stuff */ |
| if (cmd->job_context & IF_FALSE_CONTEXT) { |
| return EXIT_SUCCESS; |
| } |
| |
| /* Seems the if result was TRUE, so run the 'then' command */ |
| debug_printf( "'then' now running '%s'\n", charptr1); |
| |
| return(run_command_predicate(charptr1)); |
| } |
| |
| /* Built-in handler for 'else' (part of the 'if' command) */ |
| static int builtin_else(struct child_prog *child) |
| { |
| struct job *cmd = child->family; |
| char* charptr1=cmd->text+5; /* skip over the leading 'else ' */ |
| |
| debug_printf( "job=%p entering builtin_else ('%s')-- context=%d\n", cmd, charptr1, cmd->job_context); |
| |
| if (! (cmd->job_context & THEN_EXP_CONTEXT)) { |
| shell_context = 0; /* Reset the shell's context on an error */ |
| error_msg("%s `else'", syntax_err); |
| return EXIT_FAILURE; |
| } |
| /* If the if result was TRUE, skip the 'else' stuff */ |
| if (cmd->job_context & IF_TRUE_CONTEXT) { |
| return EXIT_SUCCESS; |
| } |
| |
| cmd->job_context |= ELSE_EXP_CONTEXT; |
| debug_printf("job=%p builtin_else set job context to %x\n", cmd, cmd->job_context); |
| |
| /* Now run the 'else' command */ |
| debug_printf( "'else' now running '%s'\n", charptr1); |
| return(run_command_predicate(charptr1)); |
| } |
| |
| /* Built-in handler for 'fi' (part of the 'if' command) */ |
| static int builtin_fi(struct child_prog *child) |
| { |
| struct job *cmd = child->family; |
| debug_printf( "job=%p entering builtin_fi ('%s')-- context=%d\n", cmd, "", cmd->job_context); |
| if (! (cmd->job_context & (IF_TRUE_CONTEXT|IF_FALSE_CONTEXT))) { |
| shell_context = 0; /* Reset the shell's context on an error */ |
| error_msg("%s `fi'", syntax_err); |
| return EXIT_FAILURE; |
| } |
| /* Clear out the if and then context bits */ |
| cmd->job_context &= ~(IF_TRUE_CONTEXT|IF_FALSE_CONTEXT|THEN_EXP_CONTEXT|ELSE_EXP_CONTEXT); |
| debug_printf("job=%p builtin_fi set job context to %x\n", cmd, cmd->job_context); |
| shell_context--; |
| return EXIT_SUCCESS; |
| } |
| #endif |
| |
| /* Built-in '.' handler (read-in and execute commands from file) */ |
| static int builtin_source(struct child_prog *child) |
| { |
| FILE *input; |
| int status; |
| int fd; |
| |
| if (child->argv[1] == NULL) |
| return EXIT_FAILURE; |
| |
| input = fopen(child->argv[1], "r"); |
| if (!input) { |
| printf( "Couldn't open file '%s'\n", child->argv[1]); |
| return EXIT_FAILURE; |
| } |
| |
| fd=fileno(input); |
| mark_open(fd); |
| /* Now run the file */ |
| status = busy_loop(input); |
| fclose(input); |
| mark_closed(fd); |
| return (status); |
| } |
| |
| /* built-in 'unset VAR' handler */ |
| static int builtin_unset(struct child_prog *child) |
| { |
| if (child->argv[1] == NULL) { |
| printf( "unset: parameter required.\n"); |
| return EXIT_FAILURE; |
| } |
| unsetenv(child->argv[1]); |
| return EXIT_SUCCESS; |
| } |
| |
| #ifdef BB_FEATURE_SH_IF_EXPRESSIONS |
| /* currently used by if/then/else. |
| * |
| * Reparsing the command line for this purpose is gross, |
| * incorrect, and fundamentally unfixable; in particular, |
| * think about what happens with command substitution. |
| * We really need to pull out the run, wait, return status |
| * functionality out of busy_loop so we can child->argv++ |
| * and use that, without going back through parse_command. |
| */ |
| static int run_command_predicate(char *cmd) |
| { |
| int n=strlen(cmd); |
| local_pending_command = xmalloc(n+1); |
| strncpy(local_pending_command, cmd, n); |
| local_pending_command[n]='\0'; |
| return( busy_loop(NULL)); |
| } |
| #endif |
| |
| static void mark_open(int fd) |
| { |
| struct close_me *new = xmalloc(sizeof(struct close_me)); |
| new->fd = fd; |
| new->next = close_me_head; |
| close_me_head = new; |
| } |
| |
| static void mark_closed(int fd) |
| { |
| struct close_me *tmp; |
| if (close_me_head == NULL || close_me_head->fd != fd) |
| error_msg_and_die("corrupt close_me"); |
| tmp = close_me_head; |
| close_me_head = close_me_head->next; |
| free(tmp); |
| } |
| |
| static void close_all() |
| { |
| struct close_me *c; |
| for (c=close_me_head; c; c=c->next) { |
| close(c->fd); |
| } |
| close_me_head = NULL; |
| } |
| |
| |
| /* free up all memory from a job */ |
| static void free_job(struct job *cmd) |
| { |
| int i; |
| |
| for (i = 0; i < cmd->num_progs; i++) { |
| free(cmd->progs[i].argv); |
| if (cmd->progs[i].redirects) |
| free(cmd->progs[i].redirects); |
| if (cmd->progs[i].free_glob) |
| globfree(&cmd->progs[i].glob_result); |
| } |
| free(cmd->progs); |
| if (cmd->text) |
| free(cmd->text); |
| free(cmd->cmdbuf); |
| memset(cmd, 0, sizeof(struct job)); |
| } |
| |
| /* remove a job from the job_list */ |
| static void remove_job(struct jobset *job_list, struct job *job) |
| { |
| struct job *prevjob; |
| |
| free_job(job); |
| if (job == job_list->head) { |
| job_list->head = job->next; |
| } else { |
| prevjob = job_list->head; |
| while (prevjob->next != job) |
| prevjob = prevjob->next; |
| prevjob->next = job->next; |
| } |
| |
| free(job); |
| } |
| |
| /* Checks to see if any background processes have exited -- if they |
| have, figure out why and see if a job has completed */ |
| static void checkjobs(struct jobset *job_list) |
| { |
| struct job *job; |
| pid_t childpid; |
| int status; |
| int prognum = 0; |
| |
| while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) { |
| for (job = job_list->head; job; job = job->next) { |
| prognum = 0; |
| while (prognum < job->num_progs && |
| job->progs[prognum].pid != childpid) prognum++; |
| if (prognum < job->num_progs) |
| break; |
| } |
| |
| /* This happens on backticked commands */ |
| if(job==NULL) |
| return; |
| |
| if (WIFEXITED(status) || WIFSIGNALED(status)) { |
| /* child exited */ |
| job->running_progs--; |
| job->progs[prognum].pid = 0; |
| |
| if (!job->running_progs) { |
| printf(JOB_STATUS_FORMAT, job->jobid, "Done", job->text); |
| remove_job(job_list, job); |
| } |
| } else { |
| /* child stopped */ |
| job->stopped_progs++; |
| job->progs[prognum].is_stopped = 1; |
| |
| if (job->stopped_progs == job->num_progs) { |
| printf(JOB_STATUS_FORMAT, job->jobid, "Stopped", |
| job->text); |
| } |
| } |
| } |
| |
| if (childpid == -1 && errno != ECHILD) |
| perror_msg("waitpid"); |
| } |
| |
| /* squirrel != NULL means we squirrel away copies of stdin, stdout, |
| * and stderr if they are redirected. */ |
| static int setup_redirects(struct child_prog *prog, int squirrel[]) |
| { |
| int i; |
| int openfd; |
| int mode = O_RDONLY; |
| struct redir_struct *redir = prog->redirects; |
| |
| for (i = 0; i < prog->num_redirects; i++, redir++) { |
| switch (redir->type) { |
| case REDIRECT_INPUT: |
| mode = O_RDONLY; |
| break; |
| case REDIRECT_OVERWRITE: |
| mode = O_WRONLY | O_CREAT | O_TRUNC; |
| break; |
| case REDIRECT_APPEND: |
| mode = O_WRONLY | O_CREAT | O_APPEND; |
| break; |
| } |
| |
| openfd = open(redir->filename, mode, 0666); |
| if (openfd < 0) { |
| /* this could get lost if stderr has been redirected, but |
| bash and ash both lose it as well (though zsh doesn't!) */ |
| error_msg("error opening %s: %s", redir->filename, |
| strerror(errno)); |
| return 1; |
| } |
| |
| if (openfd != redir->fd) { |
| if (squirrel && redir->fd < 3) { |
| squirrel[redir->fd] = dup(redir->fd); |
| } |
| dup2(openfd, redir->fd); |
| close(openfd); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void restore_redirects(int squirrel[]) |
| { |
| int i, fd; |
| for (i=0; i<3; i++) { |
| fd = squirrel[i]; |
| if (fd != -1) { |
| /* No error checking. I sure wouldn't know what |
| * to do with an error if I found one! */ |
| dup2(fd, i); |
| close(fd); |
| } |
| } |
| } |
| |
| #if defined(BB_FEATURE_SH_SIMPLE_PROMPT) |
| static char* setup_prompt_string(int state) |
| { |
| char prompt_str[BUFSIZ]; |
| |
| /* Set up the prompt */ |
| if (state == 0) { |
| /* simple prompt */ |
| sprintf(prompt_str, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); |
| } else { |
| strcpy(prompt_str,"> "); |
| } |
| |
| return(strdup(prompt_str)); /* Must free this memory */ |
| } |
| |
| #else |
| |
| static char* setup_prompt_string(int state) |
| { |
| char user[9],buf[255],*s; |
| char prompt[3]; |
| char prompt_str[BUFSIZ]; |
| |
| /* Set up the prompt */ |
| if (state == 0) { |
| /* get User Name and setup prompt */ |
| strcpy(prompt,( geteuid() != 0 ) ? "$ ":"# "); |
| my_getpwuid(user, geteuid()); |
| |
| /* get HostName */ |
| gethostname(buf, 255); |
| s = strchr(buf, '.'); |
| if (s) { |
| *s = 0; |
| } |
| } else { |
| strcpy(prompt,"> "); |
| } |
| |
| if (state == 0) { |
| snprintf(prompt_str, BUFSIZ-1, "[%s@%s %s]%s", user, buf, |
| get_last_path_component(cwd), prompt); |
| } else { |
| sprintf(prompt_str, "%s", prompt); |
| } |
| return(strdup(prompt_str)); /* Must free this memory */ |
| } |
| |
| #endif |
| |
| static int get_command(FILE * source, char *command) |
| { |
| char *prompt_str; |
| |
| if (source == NULL) { |
| if (local_pending_command) { |
| /* a command specified (-c option): return it & mark it done */ |
| strcpy(command, local_pending_command); |
| free(local_pending_command); |
| local_pending_command = NULL; |
| return 0; |
| } |
| return 1; |
| } |
| |
| if (source == stdin) { |
| prompt_str = setup_prompt_string(shell_context); |
| |
| #ifdef BB_FEATURE_SH_COMMAND_EDITING |
| /* |
| ** enable command line editing only while a command line |
| ** is actually being read; otherwise, we'll end up bequeathing |
| ** atexit() handlers and other unwanted stuff to our |
| ** child processes (rob@sysgo.de) |
| */ |
| cmdedit_init(); |
| cmdedit_read_input(prompt_str, command); |
| free(prompt_str); |
| cmdedit_terminate(); |
| return 0; |
| #else |
| fputs(prompt_str, stdout); |
| free(prompt_str); |
| #endif |
| } |
| |
| if (!fgets(command, BUFSIZ - 2, source)) { |
| if (source == stdin) |
| printf("\n"); |
| return 1; |
| } |
| |
| /* remove trailing newline */ |
| command[strlen(command) - 1] = '\0'; |
| |
| return 0; |
| } |
| |
| #ifdef BB_FEATURE_SH_ENVIRONMENT |
| static char* itoa(register int i) |
| { |
| static char a[7]; /* Max 7 ints */ |
| register char *b = a + sizeof(a) - 1; |
| int sign = (i < 0); |
| |
| if (sign) |
| i = -i; |
| *b = 0; |
| do |
| { |
| *--b = '0' + (i % 10); |
| i /= 10; |
| } |
| while (i); |
| if (sign) |
| *--b = '-'; |
| return b; |
| } |
| #endif |
| |
| static void expand_argument(struct child_prog *prog, int *argcPtr, |
| int *argv_alloced_ptr) |
| { |
| int argc_l = *argcPtr; |
| int argv_alloced = *argv_alloced_ptr; |
| int rc; |
| int flags; |
| int i; |
| char *src, *dst, *var; |
| |
| if (argc_l > 1) { /* cmd->glob_result is already initialized */ |
| flags = GLOB_APPEND; |
| i = prog->glob_result.gl_pathc; |
| } else { |
| prog->free_glob = 1; |
| flags = 0; |
| i = 0; |
| } |
| /* do shell variable substitution */ |
| if(*prog->argv[argc_l - 1] == '$') { |
| if ((var = getenv(prog->argv[argc_l - 1] + 1))) { |
| prog->argv[argc_l - 1] = var; |
| } |
| #ifdef BB_FEATURE_SH_ENVIRONMENT |
| else { |
| switch(*(prog->argv[argc_l - 1] + 1)) { |
| case '?': |
| prog->argv[argc_l - 1] = itoa(last_return_code); |
| break; |
| case '$': |
| prog->argv[argc_l - 1] = itoa(getpid()); |
| break; |
| case '#': |
| prog->argv[argc_l - 1] = itoa(argc-1); |
| break; |
| case '!': |
| if (last_bg_pid==-1) |
| *(prog->argv[argc_l - 1])='\0'; |
| else |
| prog->argv[argc_l - 1] = itoa(last_bg_pid); |
| break; |
| case '0':case '1':case '2':case '3':case '4': |
| case '5':case '6':case '7':case '8':case '9': |
| { |
| int index=*(prog->argv[argc_l - 1] + 1)-48; |
| if (index >= argc) { |
| *(prog->argv[argc_l - 1])='\0'; |
| } else { |
| prog->argv[argc_l - 1] = argv[index]; |
| } |
| } |
| break; |
| } |
| } |
| #endif |
| } |
| |
| if (strpbrk(prog->argv[argc_l - 1],"*[]?")!= NULL){ |
| rc = glob(prog->argv[argc_l - 1], flags, NULL, &prog->glob_result); |
| if (rc == GLOB_NOSPACE) { |
| error_msg("out of space during glob operation"); |
| return; |
| } else if (rc == GLOB_NOMATCH || |
| (!rc && (prog->glob_result.gl_pathc - i) == 1 && |
| strcmp(prog->argv[argc_l - 1], |
| prog->glob_result.gl_pathv[i]) == 0)) { |
| /* we need to remove whatever \ quoting is still present */ |
| src = dst = prog->argv[argc_l - 1]; |
| while (*src) { |
| if (*src == '\\') { |
| src++; |
| *dst++ = process_escape_sequence(&src); |
| } else { |
| *dst++ = *src; |
| src++; |
| } |
| } |
| *dst = '\0'; |
| } else if (!rc) { |
| argv_alloced += (prog->glob_result.gl_pathc - i); |
| prog->argv = xrealloc(prog->argv, argv_alloced * sizeof(*prog->argv)); |
| memcpy(prog->argv + (argc_l - 1), prog->glob_result.gl_pathv + i, |
| sizeof(*(prog->argv)) * (prog->glob_result.gl_pathc - i)); |
| argc_l += (prog->glob_result.gl_pathc - i - 1); |
| } |
| }else{ |
| src = dst = prog->argv[argc_l - 1]; |
| while (*src) { |
| if (*src == '\\') { |
| src++; |
| *dst++ = process_escape_sequence(&src); |
| } else { |
| *dst++ = *src; |
| src++; |
| } |
| } |
| *dst = '\0'; |
| |
| prog->glob_result.gl_pathc=0; |
| if (flags==0) |
| prog->glob_result.gl_pathv=NULL; |
| } |
| *argv_alloced_ptr = argv_alloced; |
| *argcPtr = argc_l; |
| } |
| |
| /* Return cmd->num_progs as 0 if no command is present (e.g. an empty |
| line). If a valid command is found, command_ptr is set to point to |
| the beginning of the next command (if the original command had more |
| then one job associated with it) or NULL if no more commands are |
| present. */ |
| static int parse_command(char **command_ptr, struct job *job, int *inbg) |
| { |
| char *command; |
| char *return_command = NULL; |
| char *src, *buf, *chptr; |
| int argc_l = 0; |
| int done = 0; |
| int argv_alloced; |
| int i; |
| char quote = '\0'; |
| int count; |
| struct child_prog *prog; |
| |
| /* skip leading white space */ |
| while (**command_ptr && isspace(**command_ptr)) |
| (*command_ptr)++; |
| |
| /* this handles empty lines or leading '#' characters */ |
| if (!**command_ptr || (**command_ptr == '#')) { |
| job->num_progs=0; |
| return 0; |
| } |
| |
| *inbg = 0; |
| job->num_progs = 1; |
| job->progs = xmalloc(sizeof(*job->progs)); |
| |
| /* We set the argv elements to point inside of this string. The |
| memory is freed by free_job(). Allocate twice the original |
| length in case we need to quote every single character. |
| |
| Getting clean memory relieves us of the task of NULL |
| terminating things and makes the rest of this look a bit |
| cleaner (though it is, admittedly, a tad less efficient) */ |
| job->cmdbuf = command = xcalloc(2*strlen(*command_ptr) + 1, sizeof(char)); |
| job->text = NULL; |
| |
| prog = job->progs; |
| prog->num_redirects = 0; |
| prog->redirects = NULL; |
| prog->free_glob = 0; |
| prog->is_stopped = 0; |
| prog->family = job; |
| |
| argv_alloced = 5; |
| prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced); |
| prog->argv[0] = job->cmdbuf; |
| |
| buf = command; |
| src = *command_ptr; |
| while (*src && !done) { |
| if (quote == *src) { |
| quote = '\0'; |
| } else if (quote) { |
| if (*src == '\\') { |
| src++; |
| if (!*src) { |
| error_msg("character expected after \\"); |
| free_job(job); |
| return 1; |
| } |
| |
| /* in shell, "\'" should yield \' */ |
| if (*src != quote) { |
| *buf++ = '\\'; |
| *buf++ = '\\'; |
| } |
| } else if (*src == '*' || *src == '?' || *src == '[' || |
| *src == ']') *buf++ = '\\'; |
| *buf++ = *src; |
| } else if (isspace(*src)) { |
| if (*prog->argv[argc_l]) { |
| buf++, argc_l++; |
| /* +1 here leaves room for the NULL which ends argv */ |
| if ((argc_l + 1) == argv_alloced) { |
| argv_alloced += 5; |
| prog->argv = xrealloc(prog->argv, |
| sizeof(*prog->argv) * |
| argv_alloced); |
| } |
| expand_argument(prog, &argc_l, &argv_alloced); |
| prog->argv[argc_l] = buf; |
| } |
| } else |
| switch (*src) { |
| case '"': |
| case '\'': |
| quote = *src; |
| break; |
| |
| case '#': /* comment */ |
| if (*(src-1)== '$') |
| *buf++ = *src; |
| else |
| done = 1; |
| break; |
| |
| case '>': /* redirects */ |
| case '<': |
| i = prog->num_redirects++; |
| prog->redirects = xrealloc(prog->redirects, |
| sizeof(*prog->redirects) * |
| (i + 1)); |
| |
| prog->redirects[i].fd = -1; |
| if (buf != prog->argv[argc_l]) { |
| /* the stuff before this character may be the file number |
| being redirected */ |
| prog->redirects[i].fd = |
| strtol(prog->argv[argc_l], &chptr, 10); |
| |
| if (*chptr && *prog->argv[argc_l]) { |
| buf++, argc_l++; |
| expand_argument(prog, &argc_l, &argv_alloced); |
| prog->argv[argc_l] = buf; |
| } |
| } |
| |
| if (prog->redirects[i].fd == -1) { |
| if (*src == '>') |
| prog->redirects[i].fd = 1; |
| else |
| prog->redirects[i].fd = 0; |
| } |
| |
| if (*src++ == '>') { |
| if (*src == '>') |
| prog->redirects[i].type = |
| REDIRECT_APPEND, src++; |
| else |
| prog->redirects[i].type = REDIRECT_OVERWRITE; |
| } else { |
| prog->redirects[i].type = REDIRECT_INPUT; |
| } |
| |
| /* This isn't POSIX sh compliant. Oh well. */ |
| chptr = src; |
| while (isspace(*chptr)) |
| chptr++; |
| |
| if (!*chptr) { |
| error_msg("file name expected after %c", *src); |
| free_job(job); |
| job->num_progs=0; |
| return 1; |
| } |
| |
| prog->redirects[i].filename = buf; |
| while (*chptr && !isspace(*chptr)) |
| *buf++ = *chptr++; |
| |
| src = chptr - 1; /* we src++ later */ |
| prog->argv[argc_l] = ++buf; |
| break; |
| |
| case '|': /* pipe */ |
| /* finish this command */ |
| if (*prog->argv[argc_l]) |
| argc_l++; |
| if (!argc_l) { |
| error_msg("empty command in pipe"); |
| free_job(job); |
| job->num_progs=0; |
| return 1; |
| } |
| prog->argv[argc_l] = NULL; |
| |
| /* and start the next */ |
| job->num_progs++; |
| job->progs = xrealloc(job->progs, |
| sizeof(*job->progs) * job->num_progs); |
| prog = job->progs + (job->num_progs - 1); |
| prog->num_redirects = 0; |
| prog->redirects = NULL; |
| prog->free_glob = 0; |
| prog->is_stopped = 0; |
| prog->family = job; |
| argc_l = 0; |
| |
| argv_alloced = 5; |
| prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced); |
| prog->argv[0] = ++buf; |
| |
| src++; |
| while (*src && isspace(*src)) |
| src++; |
| |
| if (!*src) { |
| error_msg("empty command in pipe"); |
| free_job(job); |
| job->num_progs=0; |
| return 1; |
| } |
| src--; /* we'll ++ it at the end of the loop */ |
| |
| break; |
| |
| case '&': /* background */ |
| *inbg = 1; |
| case ';': /* multiple commands */ |
| done = 1; |
| return_command = *command_ptr + (src - *command_ptr) + 1; |
| break; |
| |
| #ifdef BB_FEATURE_SH_BACKTICKS |
| case '`': |
| /* Exec a backtick-ed command */ |
| /* Besides any previous brokenness, I have not |
| * updated backtick handling for close_me support. |
| * I don't know if it needs it or not. -- LRD */ |
| { |
| char* charptr1=NULL, *charptr2; |
| char* ptr=NULL; |
| struct job *newjob; |
| struct jobset njob_list = { NULL, NULL }; |
| int pipefd[2]; |
| int size; |
| |
| ptr=strchr(++src, '`'); |
| if (ptr==NULL) { |
| fprintf(stderr, "Unmatched '`' in command\n"); |
| free_job(job); |
| return 1; |
| } |
| |
| /* Make some space to hold just the backticked command */ |
| charptr1 = charptr2 = xmalloc(1+ptr-src); |
| memcpy(charptr1, src, ptr-src); |
| charptr1[ptr-src] = '\0'; |
| newjob = xmalloc(sizeof(struct job)); |
| newjob->job_list = &njob_list; |
| /* Now parse and run the backticked command */ |
| if (!parse_command(&charptr1, newjob, inbg) |
| && newjob->num_progs) { |
| pipe(pipefd); |
| run_command(newjob, 0, pipefd); |
| } |
| checkjobs(job->job_list); |
| free_job(newjob); /* doesn't actually free newjob, |
| looks like a memory leak */ |
| free(charptr2); |
| |
| /* Make a copy of any stuff left over in the command |
| * line after the second backtick */ |
| charptr2 = xmalloc(strlen(ptr)+1); |
| memcpy(charptr2, ptr+1, strlen(ptr)); |
| |
| |
| /* Copy the output from the backtick-ed command into the |
| * command line, making extra room as needed */ |
| --src; |
| charptr1 = xmalloc(BUFSIZ); |
| while ( (size=full_read(pipefd[0], charptr1, BUFSIZ-1)) >0) { |
| int newsize=src - *command_ptr + size + 1 + strlen(charptr2); |
| if (newsize > BUFSIZ) { |
| *command_ptr=xrealloc(*command_ptr, newsize); |
| } |
| memcpy(src, charptr1, size); |
| src+=size; |
| } |
| free(charptr1); |
| close(pipefd[0]); |
| if (*(src-1)=='\n') |
| --src; |
| |
| /* Now paste into the *command_ptr all the stuff |
| * leftover after the second backtick */ |
| memcpy(src, charptr2, strlen(charptr2)+1); |
| free(charptr2); |
| |
| /* Now recursively call parse_command to deal with the new |
| * and improved version of the command line with the backtick |
| * results expanded in place... */ |
| { |
| struct jobset *jl=job->job_list; |
| free_job(job); |
| job->job_list = jl; |
| } |
| return(parse_command(command_ptr, job, inbg)); |
| } |
| break; |
| #endif // BB_FEATURE_SH_BACKTICKS |
| |
| case '\\': |
| src++; |
| if (!*src) { |
| /* This is currently a little broken... */ |
| #ifdef HANDLE_CONTINUATION_CHARS |
| /* They fed us a continuation char, so continue reading stuff |
| * on the next line, then tack that onto the end of the current |
| * command */ |
| char *command; |
| int newsize; |
| printf("erik: found a continue char at EOL...\n"); |
| command = (char *) xcalloc(BUFSIZ, sizeof(char)); |
| if (get_command(input, command)) { |
| error_msg("character expected after \\"); |
| free(command); |
| free_job(job); |
| return 1; |
| } |
| newsize = strlen(*command_ptr) + strlen(command) + 2; |
| if (newsize > BUFSIZ) { |
| printf("erik: doing realloc\n"); |
| *command_ptr=xrealloc(*command_ptr, newsize); |
| } |
| printf("erik: A: *command_ptr='%s'\n", *command_ptr); |
| memcpy(--src, command, strlen(command)); |
| printf("erik: B: *command_ptr='%s'\n", *command_ptr); |
| free(command); |
| break; |
| #else |
| error_msg("character expected after \\"); |
| free(command); |
| free_job(job); |
| return 1; |
| #endif |
| } |
| if (*src == '*' || *src == '[' || *src == ']' |
| || *src == '?') *buf++ = '\\'; |
| /* fallthrough */ |
| default: |
| *buf++ = *src; |
| } |
| |
| src++; |
| } |
| |
| if (*prog->argv[argc_l]) { |
| argc_l++; |
| expand_argument(prog, &argc_l, &argv_alloced); |
| } |
| if (!argc_l) { |
| free_job(job); |
| return 0; |
| } |
| prog->argv[argc_l] = NULL; |
| |
| if (!return_command) { |
| job->text = xmalloc(strlen(*command_ptr) + 1); |
| strcpy(job->text, *command_ptr); |
| } else { |
| /* This leaves any trailing spaces, which is a bit sloppy */ |
| count = return_command - *command_ptr; |
| job->text = xmalloc(count + 1); |
| strncpy(job->text, *command_ptr, count); |
| job->text[count] = '\0'; |
| } |
| |
| *command_ptr = return_command; |
| |
| return 0; |
| } |
| |
| /* Run the child_prog, no matter what kind of command it uses. |
| */ |
| static int pseudo_exec(struct child_prog *child) |
| { |
| struct built_in_command *x; |
| #ifdef BB_FEATURE_SH_STANDALONE_SHELL |
| struct BB_applet *applet; |
| char *name; |
| #endif |
| |
| /* Check if the command matches any of the non-forking builtins. |
| * Depending on context, this might be redundant. But it's |
| * easier to waste a few CPU cycles than it is to figure out |
| * if this is one of those cases. |
| */ |
| for (x = bltins; x->cmd; x++) { |
| if (strcmp(child->argv[0], x->cmd) == 0 ) { |
| exit(x->function(child)); |
| } |
| } |
| |
| /* Check if the command matches any of the forking builtins. */ |
| for (x = bltins_forking; x->cmd; x++) { |
| if (strcmp(child->argv[0], x->cmd) == 0) { |
| applet_name=x->cmd; |
| exit (x->function(child)); |
| } |
| } |
| #ifdef BB_FEATURE_SH_STANDALONE_SHELL |
| /* Check if the command matches any busybox internal |
| * commands ("applets") here. Following discussions from |
| * November 2000 on busybox@opensource.lineo.com, don't use |
| * get_last_path_component(). This way explicit (with |
| * slashes) filenames will never be interpreted as an |
| * applet, just like with builtins. This way the user can |
| * override an applet with an explicit filename reference. |
| * The only downside to this change is that an explicit |
| * /bin/foo invocation will fork and exec /bin/foo, even if |
| * /bin/foo is a symlink to busybox. |
| */ |
| name = child->argv[0]; |
| |
| #ifdef BB_FEATURE_SH_APPLETS_ALWAYS_WIN |
| /* If you enable BB_FEATURE_SH_APPLETS_ALWAYS_WIN, then |
| * if you run /bin/cat, it will use BusyBox cat even if |
| * /bin/cat exists on the filesystem and is _not_ busybox. |
| * Some systems want this, others do not. Choose wisely. :-) |
| */ |
| name = get_last_path_component(name); |
| #endif |
| |
| /* Do a binary search to find the applet entry given the name. */ |
| if ((applet = find_applet_by_name(name)) != NULL) { |
| int argc_l; |
| char** argv=child->argv; |
| for(argc_l=0;*argv!=NULL; argv++, argc_l++); |
| applet_name=applet->name; |
| optind = 1; |
| exit((*(applet->main)) (argc_l, child->argv)); |
| } |
| #endif |
| |
| execvp(child->argv[0], child->argv); |
| perror_msg_and_die("%s", child->argv[0]); |
| } |
| |
| static void insert_job(struct job *newjob, int inbg) |
| { |
| struct job *thejob; |
| struct jobset *job_list=newjob->job_list; |
| |
| /* find the ID for thejob to use */ |
| newjob->jobid = 1; |
| for (thejob = job_list->head; thejob; thejob = thejob->next) |
| if (thejob->jobid >= newjob->jobid) |
| newjob->jobid = thejob->jobid + 1; |
| |
| /* add thejob to the list of running jobs */ |
| if (!job_list->head) { |
| thejob = job_list->head = xmalloc(sizeof(*thejob)); |
| } else { |
| for (thejob = job_list->head; thejob->next; thejob = thejob->next) /* nothing */; |
| thejob->next = xmalloc(sizeof(*thejob)); |
| thejob = thejob->next; |
| } |
| |
| *thejob = *newjob; /* physically copy the struct job */ |
| thejob->next = NULL; |
| thejob->running_progs = thejob->num_progs; |
| thejob->stopped_progs = 0; |
| |
| if (inbg) { |
| /* we don't wait for background thejobs to return -- append it |
| to the list of backgrounded thejobs and leave it alone */ |
| printf("[%d] %d\n", thejob->jobid, |
| newjob->progs[newjob->num_progs - 1].pid); |
| #ifdef BB_FEATURE_SH_ENVIRONMENT |
| last_bg_pid=newjob->progs[newjob->num_progs - 1].pid; |
| #endif |
| } else { |
| newjob->job_list->fg = thejob; |
| |
| /* move the new process group into the foreground */ |
| /* suppress messages when run from /linuxrc mag@sysgo.de */ |
| if (tcsetpgrp(0, newjob->pgrp) && errno != ENOTTY) |
| perror_msg("tcsetpgrp"); |
| } |
| } |
| |
| static int run_command(struct job *newjob, int inbg, int outpipe[2]) |
| { |
| /* struct job *thejob; */ |
| int i; |
| int nextin, nextout; |
| int pipefds[2]; /* pipefd[0] is for reading */ |
| struct built_in_command *x; |
| struct child_prog *child; |
| |
| nextin = 0, nextout = 1; |
| for (i = 0; i < newjob->num_progs; i++) { |
| child = & (newjob->progs[i]); |
| |
| if ((i + 1) < newjob->num_progs) { |
| if (pipe(pipefds)<0) perror_msg_and_die("pipe"); |
| nextout = pipefds[1]; |
| } else { |
| if (outpipe[1]!=-1) { |
| nextout = outpipe[1]; |
| } else { |
| nextout = 1; |
| } |
| } |
| |
| #ifdef BB_FEATURE_SH_ENVIRONMENT |
| if (show_x_trace==TRUE) { |
| int j; |
| fputc('+', stderr); |
| for (j = 0; child->argv[j]; j++) { |
| fputc(' ', stderr); |
| fputs(child->argv[j], stderr); |
| } |
| fputc('\n', stderr); |
| } |
| #endif |
| |
| /* Check if the command matches any non-forking builtins, |
| * but only if this is a simple command. |
| * Non-forking builtins within pipes have to fork anyway, |
| * and are handled in pseudo_exec. "echo foo | read bar" |
| * is doomed to failure, and doesn't work on bash, either. |
| */ |
| if (newjob->num_progs == 1) { |
| for (x = bltins; x->cmd; x++) { |
| if (strcmp(child->argv[0], x->cmd) == 0 ) { |
| int squirrel[] = {-1, -1, -1}; |
| int rcode; |
| setup_redirects(child, squirrel); |
| rcode = x->function(child); |
| restore_redirects(squirrel); |
| return rcode; |
| } |
| } |
| } |
| |
| if (!(child->pid = fork())) { |
| signal(SIGTTOU, SIG_DFL); |
| |
| close_all(); |
| |
| if (outpipe[1]!=-1) { |
| close(outpipe[0]); |
| } |
| if (nextin != 0) { |
| dup2(nextin, 0); |
| close(nextin); |
| } |
| |
| if (nextout != 1) { |
| dup2(nextout, 1); |
| dup2(nextout, 2); /* Really? */ |
| close(nextout); |
| close(pipefds[0]); |
| } |
| |
| /* explicit redirects override pipes */ |
| setup_redirects(child,NULL); |
| |
| pseudo_exec(child); |
| } |
| if (outpipe[1]!=-1) { |
| close(outpipe[1]); |
| } |
| |
| /* put our child in the process group whose leader is the |
| first process in this pipe */ |
| setpgid(child->pid, newjob->progs[0].pid); |
| if (nextin != 0) |
| close(nextin); |
| if (nextout != 1) |
| close(nextout); |
| |
| /* If there isn't another process, nextin is garbage |
| but it doesn't matter */ |
| nextin = pipefds[0]; |
| } |
| |
| newjob->pgrp = newjob->progs[0].pid; |
| |
| insert_job(newjob, inbg); |
| |
| return 0; |
| } |
| |
| static int busy_loop(FILE * input) |
| { |
| char *command; |
| char *next_command = NULL; |
| struct job newjob; |
| pid_t parent_pgrp; |
| int i; |
| int inbg; |
| int status; |
| newjob.job_list = &job_list; |
| newjob.job_context = DEFAULT_CONTEXT; |
| |
| /* save current owner of TTY so we can restore it on exit */ |
| parent_pgrp = tcgetpgrp(0); |
| |
| command = (char *) xcalloc(BUFSIZ, sizeof(char)); |
| |
| /* don't pay any attention to this signal; it just confuses |
| things and isn't really meant for shells anyway */ |
| signal(SIGTTOU, SIG_IGN); |
| |
| while (1) { |
| if (!job_list.fg) { |
| /* no job is in the foreground */ |
| |
| /* see if any background processes have exited */ |
| checkjobs(&job_list); |
| |
| if (!next_command) { |
| if (get_command(input, command)) |
| break; |
| next_command = command; |
| } |
| |
| if (!parse_command(&next_command, &newjob, &inbg) && |
| newjob.num_progs) { |
| int pipefds[2] = {-1,-1}; |
| debug_printf( "job=%p being fed to run_command by busy_loop()'\n", &newjob); |
| run_command(&newjob, inbg, pipefds); |
| } |
| else { |
| free(command); |
| command = (char *) xcalloc(BUFSIZ, sizeof(char)); |
| next_command = NULL; |
| } |
| } else { |
| /* a job is running in the foreground; wait for it */ |
| i = 0; |
| while (!job_list.fg->progs[i].pid || |
| job_list.fg->progs[i].is_stopped == 1) i++; |
| |
| if (waitpid(job_list.fg->progs[i].pid, &status, WUNTRACED)<0) |
| perror_msg_and_die("waitpid(%d)",job_list.fg->progs[i].pid); |
| |
| if (WIFEXITED(status) || WIFSIGNALED(status)) { |
| /* the child exited */ |
| job_list.fg->running_progs--; |
| job_list.fg->progs[i].pid = 0; |
| |
| #ifdef BB_FEATURE_SH_ENVIRONMENT |
| last_return_code=WEXITSTATUS(status); |
| #endif |
| debug_printf("'%s' exited -- return code %d\n", |
| job_list.fg->text, last_return_code); |
| if (!job_list.fg->running_progs) { |
| /* child exited */ |
| remove_job(&job_list, job_list.fg); |
| job_list.fg = NULL; |
| } |
| } else { |
| /* the child was stopped */ |
| job_list.fg->stopped_progs++; |
| job_list.fg->progs[i].is_stopped = 1; |
| |
| if (job_list.fg->stopped_progs == job_list.fg->running_progs) { |
| printf("\n" JOB_STATUS_FORMAT, job_list.fg->jobid, |
| "Stopped", job_list.fg->text); |
| job_list.fg = NULL; |
| } |
| } |
| |
| if (!job_list.fg) { |
| /* move the shell to the foreground */ |
| /* suppress messages when run from /linuxrc mag@sysgo.de */ |
| if (tcsetpgrp(0, getpid()) && errno != ENOTTY) |
| perror_msg("tcsetpgrp"); |
| } |
| } |
| } |
| free(command); |
| |
| /* return controlling TTY back to parent process group before exiting */ |
| if (tcsetpgrp(0, parent_pgrp)) |
| perror_msg("tcsetpgrp"); |
| |
| /* return exit status if called with "-c" */ |
| if (input == NULL && WIFEXITED(status)) |
| return WEXITSTATUS(status); |
| |
| return 0; |
| } |
| |
| |
| #ifdef BB_FEATURE_CLEAN_UP |
| void free_memory(void) |
| { |
| if (cwd) |
| free(cwd); |
| if (local_pending_command) |
| free(local_pending_command); |
| |
| if (job_list.fg && !job_list.fg->running_progs) { |
| remove_job(&job_list, job_list.fg); |
| } |
| } |
| #endif |
| |
| |
| int shell_main(int argc_l, char **argv_l) |
| { |
| int opt, interactive=FALSE; |
| FILE *input = stdin; |
| argc = argc_l; |
| argv = argv_l; |
| |
| shell_context = 0; |
| cwd=NULL; |
| #ifdef BB_FEATURE_SH_STANDALONE_SHELL |
| /* These variables need re-initializing when recursing */ |
| local_pending_command = NULL; |
| job_list.head = NULL; |
| job_list.fg = NULL; |
| #ifdef BB_FEATURE_SH_ENVIRONMENT |
| last_bg_pid=-1; |
| last_return_code=-1; |
| show_x_trace=FALSE; |
| #endif |
| #endif |
| |
| if (argv[0] && argv[0][0] == '-') { |
| FILE *prof_input; |
| prof_input = fopen("/etc/profile", "r"); |
| if (!prof_input) { |
| printf( "Couldn't open file '/etc/profile'\n"); |
| } else { |
| int tmp_fd = fileno(prof_input); |
| mark_open(tmp_fd); |
| /* Now run the file */ |
| busy_loop(prof_input); |
| fclose(prof_input); |
| mark_closed(tmp_fd); |
| } |
| } |
| |
| while ((opt = getopt(argc_l, argv_l, "cxi")) > 0) { |
| switch (opt) { |
| case 'c': |
| input = NULL; |
| if (local_pending_command != 0) |
| error_msg_and_die("multiple -c arguments"); |
| local_pending_command = xstrdup(argv[optind]); |
| optind++; |
| argv = argv+optind; |
| break; |
| #ifdef BB_FEATURE_SH_ENVIRONMENT |
| case 'x': |
| show_x_trace = TRUE; |
| break; |
| #endif |
| case 'i': |
| interactive = TRUE; |
| break; |
| default: |
| usage(shell_usage); |
| } |
| } |
| /* A shell is interactive if the `-i' flag was given, or if all of |
| * the following conditions are met: |
| * no -c command |
| * no arguments remaining or the -s flag given |
| * standard input is a terminal |
| * standard output is a terminal |
| * Refer to Posix.2, the description of the `sh' utility. */ |
| if (argv[optind]==NULL && input==stdin && |
| isatty(fileno(stdin)) && isatty(fileno(stdout))) { |
| interactive=TRUE; |
| } |
| if (interactive==TRUE) { |
| //printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]); |
| /* Looks like they want an interactive shell */ |
| printf( "\n\nBusyBox v%s (%s) Built-in shell (lash)\n", BB_VER, BB_BT); |
| printf( "Enter 'help' for a list of built-in commands.\n\n"); |
| } else if (local_pending_command==NULL) { |
| //printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]); |
| input = xfopen(argv[optind], "r"); |
| mark_open(fileno(input)); /* be lazy, never mark this closed */ |
| } |
| |
| /* initialize the cwd -- this is never freed...*/ |
| cwd=(char*)xmalloc(sizeof(char)*MAX_LINE+1); |
| getcwd(cwd, sizeof(char)*MAX_LINE); |
| |
| #ifdef BB_FEATURE_CLEAN_UP |
| atexit(free_memory); |
| #endif |
| |
| return (busy_loop(input)); |
| } |