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-rw-r--r--sh.c1935
1 files changed, 0 insertions, 1935 deletions
diff --git a/sh.c b/sh.c
deleted file mode 100644
index 1d12835..0000000
--- a/sh.c
+++ /dev/null
@@ -1,1935 +0,0 @@
-/* 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 -- sortof...
-#define BB_FEATURE_SH_IF_EXPRESSIONS
-//
-/* This is currently sortof broken, only for the brave... */
-#undef HANDLE_CONTINUATION_CHARS
-//
-/* This would be great -- if wordexp wouldn't strip all quoting
- * out from the target strings... As is, a parser needs */
-#undef BB_FEATURE_SH_WORDEXP
-//
-//For debugging/development on the shell only...
-//#define DEBUG_SHELL
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <sys/wait.h>
-#include <unistd.h>
-#include <getopt.h>
-#include "busybox.h"
-#include "cmdedit.h"
-
-#ifdef BB_LOCALE_SUPPORT
-#include <locale.h>
-#endif
-
-//#define BB_FEATURE_SH_WORDEXP
-
-#ifdef BB_FEATURE_SH_WORDEXP
-#include <wordexp.h>
-#define expand_t wordexp_t
-#undef BB_FEATURE_SH_BACKTICKS
-#else
-#include <glob.h>
-#define expand_t glob_t
-#endif
-
-
-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 */
- 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_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 close_all(void);
-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[] = {
- {"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;
-#ifdef BB_FEATURE_SH_ENVIRONMENT
-static int last_bg_pid;
-static int last_return_code;
-static int show_x_trace;
-#endif
-#ifdef BB_FEATURE_SH_IF_EXPRESSIONS
-static char syntax_err[]="syntax error near unexpected token";
-#endif
-
-static char *PS1;
-static char *PS2 = "> ";
-
-
-#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]
-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]
-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: %m\n", newdir);
- return EXIT_FAILURE;
- }
- cwd = xgetcwd(cwd);
-
- return EXIT_SUCCESS;
-}
-
-/* built-in 'exec' handler */
-static int builtin_exec(struct child_prog *child)
-{
- if (child->argv[1] == NULL)
- return EXIT_SUCCESS; /* Really? */
- child->argv++;
- close_all();
- 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)
-{
- printf( "%s\n", cwd);
- return EXIT_SUCCESS;
-}
-
-/* built-in 'export VAR=value' handler */
-static int builtin_export(struct child_prog *child)
-{
- int res;
- char *v = child->argv[1];
-
- if (v == NULL) {
- char **e;
- for (e = environ; *e; e++) {
- printf( "%s\n", *e);
- }
- return 0;
- }
- res = putenv(v);
- if (res)
- fprintf(stderr, "export: %m\n");
-#ifndef BB_FEATURE_SH_SIMPLE_PROMPT
- if (strncmp(v, "PS1=", 4)==0)
- PS1 = getenv("PS1");
-#endif
-
-#ifdef BB_LOCALE_SUPPORT
- if(strncmp(v, "LC_ALL=", 7)==0)
- setlocale(LC_ALL, getenv("LC_ALL"));
- if(strncmp(v, "LC_CTYPE=", 9)==0)
- setlocale(LC_CTYPE, getenv("LC_CTYPE"));
-#endif
-
- 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: %m\n");
- }
- 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)
-{
- local_pending_command = xstrdup(cmd);
- 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, *tmp;
- for (c=close_me_head; c; c=tmp) {
- close(c->fd);
- tmp=c->next;
- free(c);
- }
- close_me_head = NULL;
-}
-
-
-/* free up all memory from a job */
-static void free_job(struct job *cmd)
-{
- int i;
- struct jobset *keep;
-
- 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)
- free(cmd->progs);
- if (cmd->text)
- free(cmd->text);
- if (cmd->cmdbuf)
- free(cmd->cmdbuf);
- keep = cmd->job_list;
- memset(cmd, 0, sizeof(struct job));
- cmd->job_list = keep;
-}
-
-/* remove a job from a jobset */
-static void remove_job(struct jobset *j_list, struct job *job)
-{
- struct job *prevjob;
-
- free_job(job);
- if (job == j_list->head) {
- j_list->head = job->next;
- } else {
- prevjob = j_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 *j_list)
-{
- struct job *job;
- pid_t childpid;
- int status;
- int prognum = 0;
-
- while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
- for (job = j_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(j_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!) */
- perror_msg("error opening %s", redir->filename);
- 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);
- }
- }
-}
-
-static inline void cmdedit_set_initial_prompt(void)
-{
-#ifdef BB_FEATURE_SH_SIMPLE_PROMPT
- PS1 = NULL;
-#else
- PS1 = getenv("PS1");
- if(PS1==0)
- PS1 = "\\w \\$ ";
-#endif
-}
-
-static inline void setup_prompt_string(char **prompt_str)
-{
-#ifdef BB_FEATURE_SH_SIMPLE_PROMPT
- /* Set up the prompt */
- if (shell_context == 0) {
- if (PS1)
- free(PS1);
- PS1=xmalloc(strlen(cwd)+4);
- sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
- *prompt_str = PS1;
- } else {
- *prompt_str = PS2;
- }
-#else
- *prompt_str = (shell_context==0)? PS1 : PS2;
-#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) {
- setup_prompt_string(&prompt_str);
-
-#ifdef BB_FEATURE_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_read_input(prompt_str, command);
- cmdedit_terminate();
- return 0;
-#else
- fputs(prompt_str, stdout);
-#endif
- }
-
- if (!fgets(command, BUFSIZ - 2, source)) {
- if (source == stdin)
- printf("\n");
- return 1;
- }
-
- 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
-
-#if defined BB_FEATURE_SH_ENVIRONMENT && ! defined BB_FEATURE_SH_WORDEXP
-char * strsep_space( char *string, int * ix)
-{
- char *token, *begin;
-
- begin = string;
-
- /* Short circuit the trivial case */
- if ( !string || ! string[*ix])
- return NULL;
-
- /* Find the end of the token. */
- while( string && string[*ix] && !isspace(string[*ix]) ) {
- (*ix)++;
- }
-
- /* Find the end of any whitespace trailing behind
- * the token and let that be part of the token */
- while( string && string[*ix] && isspace(string[*ix]) ) {
- (*ix)++;
- }
-
- if (! string && *ix==0) {
- /* Nothing useful was found */
- return NULL;
- }
-
- token = xmalloc(*ix+1);
- token[*ix] = '\0';
- strncpy(token, string, *ix);
-
- return token;
-}
-#endif
-
-
-static int expand_arguments(char *command)
-{
-#ifdef BB_FEATURE_SH_ENVIRONMENT
- expand_t expand_result;
- char *src, *dst, *var;
- int ix = 0;
- int i=0, length, total_length=0, retval;
- const char *out_of_space = "out of space during expansion";
-#endif
-
- /* get rid of the terminating \n */
- chomp(command);
-
- /* Fix up escape sequences to be the Real Thing(tm) */
- while( command && command[ix]) {
- if (command[ix] == '\\') {
- const char *tmp = command+ix+1;
- command[ix] = process_escape_sequence( &tmp );
- memmove(command+ix + 1, tmp, strlen(tmp)+1);
- }
- ix++;
- }
-
-#ifdef BB_FEATURE_SH_ENVIRONMENT
-
-
-#ifdef BB_FEATURE_SH_WORDEXP
- /* This first part uses wordexp() which is a wonderful C lib
- * function which expands nearly everything. */
- retval = wordexp (command, &expand_result, WRDE_SHOWERR);
- if (retval == WRDE_NOSPACE) {
- /* Mem may have been allocated... */
- wordfree (&expand_result);
- error_msg(out_of_space);
- return FALSE;
- }
- if (retval < 0) {
- /* Some other error. */
- error_msg("syntax error");
- return FALSE;
- }
-
- if (expand_result.we_wordc > 0) {
- /* Convert from char** (one word per string) to a simple char*,
- * but don't overflow command which is BUFSIZ in length */
- *command = '\0';
- while (i < expand_result.we_wordc && total_length < BUFSIZ) {
- length=strlen(expand_result.we_wordv[i])+1;
- if (BUFSIZ-total_length-length <= 0) {
- error_msg(out_of_space);
- return FALSE;
- }
- strcat(command+total_length, expand_result.we_wordv[i++]);
- strcat(command+total_length, " ");
- total_length+=length;
- }
- wordfree (&expand_result);
- }
-#else
-
- /* Ok. They don't have a recent glibc and they don't have uClibc. Chances
- * are about 100% they don't have wordexp(). So instead the best we can do
- * is use glob and then fixup environment variables and such ourselves.
- * This is better then nothing, but certainly not perfect */
-
- /* It turns out that glob is very stupid. We have to feed it one word at a
- * time since it can't cope with a full string. Here we convert command
- * (char*) into cmd (char**, one word per string) */
- {
-
- int flags = GLOB_NOCHECK
-#ifdef GLOB_BRACE
- | GLOB_BRACE
-#endif
-#ifdef GLOB_TILDE
- | GLOB_TILDE
-#endif
- ;
- char *tmpcmd, *cmd, *cmd_copy;
- /* We need a clean copy, so strsep can mess up the copy while
- * we write stuff into the original (in a minute) */
- cmd = cmd_copy = strdup(command);
- *command = '\0';
- for (ix = 0, tmpcmd = cmd;
- (tmpcmd = strsep_space(cmd, &ix)) != NULL; cmd += ix, ix=0) {
- if (*tmpcmd == '\0')
- break;
- /* we need to trim() the result for glob! */
- trim(tmpcmd);
- retval = glob(tmpcmd, flags, NULL, &expand_result);
- free(tmpcmd); /* Free mem allocated by strsep_space */
- if (retval == GLOB_NOSPACE) {
- /* Mem may have been allocated... */
- globfree (&expand_result);
- error_msg(out_of_space);
- return FALSE;
- } else if (retval != 0) {
- /* Some other error. GLOB_NOMATCH shouldn't
- * happen because of the GLOB_NOCHECK flag in
- * the glob call. */
- error_msg("syntax error");
- return FALSE;
- } else {
- /* Convert from char** (one word per string) to a simple char*,
- * but don't overflow command which is BUFSIZ in length */
- for (i=0; i < expand_result.gl_pathc; i++) {
- length=strlen(expand_result.gl_pathv[i]);
- if (total_length+length+1 >= BUFSIZ) {
- error_msg(out_of_space);
- return FALSE;
- }
- strcat(command+total_length, " ");
- total_length+=1;
- strcat(command+total_length, expand_result.gl_pathv[i]);
- total_length+=length;
- }
- globfree (&expand_result);
- }
- }
- free(cmd_copy);
- trim(command);
- }
-
-#endif
-
- /* Now do the shell variable substitutions which
- * wordexp can't do for us, namely $? and $! */
- src = command;
- while((dst = strchr(src,'$')) != NULL){
- var = NULL;
- switch(*(dst+1)) {
- case '?':
- var = itoa(last_return_code);
- break;
- case '!':
- if (last_bg_pid==-1)
- *(var)='\0';
- else
- var = itoa(last_bg_pid);
- break;
- /* Everything else like $$, $#, $[0-9], etc should all be
- * expanded by wordexp(), so we can in theory skip that stuff
- * here, but just to be on the safe side (i.e. since uClibc
- * wordexp doesn't do this stuff yet), lets leave it in for
- * now. */
- case '$':
- var = itoa(getpid());
- break;
- case '#':
- var = itoa(argc-1);
- break;
- case '0':case '1':case '2':case '3':case '4':
- case '5':case '6':case '7':case '8':case '9':
- {
- int ixx=*(dst + 1)-48;
- if (ixx >= argc) {
- var='\0';
- } else {
- var = argv[ixx];
- }
- }
- break;
-
- }
- if (var) {
- /* a single character construction was found, and
- * already handled in the case statement */
- src=dst+2;
- } else {
- /* Looks like an environment variable */
- char delim_hold;
- int num_skip_chars=0;
- int dstlen = strlen(dst);
- /* Is this a ${foo} type variable? */
- if (dstlen >=2 && *(dst+1) == '{') {
- src=strchr(dst+1, '}');
- num_skip_chars=1;
- } else {
- src=dst+1;
- while(isalnum(*src) || *src=='_') src++;
- }
- if (src == NULL) {
- src = dst+dstlen;
- }
- delim_hold=*src;
- *src='\0'; /* temporary */
- var = getenv(dst + 1 + num_skip_chars);
- *src=delim_hold;
- src += num_skip_chars;
- }
- if (var == NULL) {
- /* Seems we got an un-expandable variable. So delete it. */
- var = "";
- }
- {
- int subst_len = strlen(var);
- int trail_len = strlen(src);
- if (dst+subst_len+trail_len >= command+BUFSIZ) {
- error_msg(out_of_space);
- return FALSE;
- }
- /* Move stuff to the end of the string to accommodate
- * filling the created gap with the new stuff */
- memmove(dst+subst_len, src, trail_len+1);
- /* Now copy in the new stuff */
- memcpy(dst, var, subst_len);
- src = dst+subst_len;
- }
- }
-
-#endif
- return TRUE;
-}
-
-/* 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, saw_quote = 0;
- 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->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] || saw_quote) {
- 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);
- }
- prog->argv[argc_l] = buf;
- saw_quote = 0;
- }
- } else
- switch (*src) {
- case '"':
- case '\'':
- quote = *src;
- saw_quote = 1;
- 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++;
- 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-1));
- 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] || saw_quote)
- 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->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_job(job);
- return 1;
-#endif
- }
- if (*src == '*' || *src == '[' || *src == ']'
- || *src == '?') *buf++ = '\\';
- /* fallthrough */
- default:
- *buf++ = *src;
- }
-
- src++;
- }
-
- if (*prog->argv[argc_l] || saw_quote) {
- argc_l++;
- }
- 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
- 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
-
- {
- char** argv_l=child->argv;
- int argc_l;
- for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
- optind = 1;
- run_applet_by_name(name, 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 *j_list=newjob->job_list;
-
- /* find the ID for thejob to use */
- newjob->jobid = 1;
- for (thejob = j_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 (!j_list->head) {
- thejob = j_list->head = xmalloc(sizeof(*thejob));
- } else {
- for (thejob = j_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 (expand_arguments(next_command) == FALSE) {
- free(command);
- command = (char *) xcalloc(BUFSIZ, sizeof(char));
- next_command = NULL;
- continue;
- }
-
- if (!parse_command(&next_command, &newjob, &inbg) &&
- newjob.num_progs) {
- int pipefds[2] = {-1,-1};
- debug_printf( "job=%p 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);
- debug_printf("'%s' exited -- return code %d\n",
- job_list.fg->text, last_return_code);
-#endif
- 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, getpgrp()) && 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);
- cwd = NULL;
- }
- 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;
-
- /* These variables need re-initializing when recursing */
- shell_context = 0;
- local_pending_command = NULL;
- close_me_head = 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
-
- 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:
- show_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\n" BB_BANNER " Built-in shell (lash)\n");
- 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 = xgetcwd(0);
-
-#ifdef BB_FEATURE_CLEAN_UP
- atexit(free_memory);
-#endif
-
-#ifdef BB_FEATURE_COMMAND_EDITING
- cmdedit_set_initial_prompt();
-#else
- PS1 = NULL;
-#endif
-
- return (busy_loop(input));
-}
-