mirror of
https://github.com/sheumann/hush.git
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1574 lines
39 KiB
C
1574 lines
39 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* lash -- the BusyBox Lame-Ass SHell
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Based in part on ladsh.c by Michael K. Johnson and Erik W. Troan, which is
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* under the following liberal license: "We have placed this source code in the
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* public domain. Use it in any project, free or commercial."
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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/* This shell's parsing engine is officially at a dead-end. Future
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* work shell work should be done using hush, msh, or ash. This is
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* still a very useful, small shell -- it just don't need any more
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* features beyond what it already has...
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*/
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//For debugging/development on the shell only...
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//#define DEBUG_SHELL
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#include "busybox.h"
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#include <getopt.h>
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#include "cmdedit.h"
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#include <glob.h>
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#define expand_t glob_t
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/* Always enable for the moment... */
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#define CONFIG_LASH_PIPE_N_REDIRECTS
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#define CONFIG_LASH_JOB_CONTROL
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static const int MAX_READ = 128; /* size of input buffer for `read' builtin */
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#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
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#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
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enum redir_type { REDIRECT_INPUT, REDIRECT_OVERWRITE,
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REDIRECT_APPEND
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};
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#endif
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enum {
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DEFAULT_CONTEXT = 0x1,
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IF_TRUE_CONTEXT = 0x2,
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IF_FALSE_CONTEXT = 0x4,
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THEN_EXP_CONTEXT = 0x8,
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ELSE_EXP_CONTEXT = 0x10
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};
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#define LASH_OPT_DONE (1)
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#define LASH_OPT_SAW_QUOTE (2)
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#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
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struct redir_struct {
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enum redir_type type; /* type of redirection */
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int fd; /* file descriptor being redirected */
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char *filename; /* file to redirect fd to */
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};
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#endif
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struct child_prog {
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pid_t pid; /* 0 if exited */
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char **argv; /* program name and arguments */
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int num_redirects; /* elements in redirection array */
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int is_stopped; /* is the program currently running? */
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struct job *family; /* pointer back to the child's parent job */
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#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
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struct redir_struct *redirects; /* I/O redirects */
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#endif
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};
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struct jobset {
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struct job *head; /* head of list of running jobs */
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struct job *fg; /* current foreground job */
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};
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struct job {
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int jobid; /* job number */
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int num_progs; /* total number of programs in job */
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int running_progs; /* number of programs running */
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char *text; /* name of job */
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char *cmdbuf; /* buffer various argv's point into */
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pid_t pgrp; /* process group ID for the job */
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struct child_prog *progs; /* array of programs in job */
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struct job *next; /* to track background commands */
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int stopped_progs; /* number of programs alive, but stopped */
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unsigned int job_context; /* bitmask defining current context */
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struct jobset *job_list;
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};
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struct built_in_command {
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char *cmd; /* name */
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char *descr; /* description */
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int (*function) (struct child_prog *); /* function ptr */
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};
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/* function prototypes for builtins */
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static int builtin_cd(struct child_prog *cmd);
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static int builtin_exec(struct child_prog *cmd);
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static int builtin_exit(struct child_prog *cmd);
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static int builtin_fg_bg(struct child_prog *cmd);
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static int builtin_help(struct child_prog *cmd);
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static int builtin_jobs(struct child_prog *dummy);
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static int builtin_pwd(struct child_prog *dummy);
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static int builtin_export(struct child_prog *cmd);
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static int builtin_source(struct child_prog *cmd);
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static int builtin_unset(struct child_prog *cmd);
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static int builtin_read(struct child_prog *cmd);
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/* function prototypes for shell stuff */
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static void checkjobs(struct jobset *job_list);
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static void remove_job(struct jobset *j_list, struct job *job);
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static int get_command(FILE * source, char *command);
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static int parse_command(char **command_ptr, struct job *job, int *inbg);
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static int run_command(struct job *newjob, int inbg, int outpipe[2]);
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static int pseudo_exec(struct child_prog *cmd) ATTRIBUTE_NORETURN;
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static int busy_loop(FILE * input);
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/* Table of built-in functions (these are non-forking builtins, meaning they
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* can change global variables in the parent shell process but they will not
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* work with pipes and redirects; 'unset foo | whatever' will not work) */
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static struct built_in_command bltins[] = {
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{"bg", "Resume a job in the background", builtin_fg_bg},
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{"cd", "Change working directory", builtin_cd},
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{"exec", "Exec command, replacing this shell with the exec'd process", builtin_exec},
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{"exit", "Exit from shell()", builtin_exit},
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{"fg", "Bring job into the foreground", builtin_fg_bg},
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{"jobs", "Lists the active jobs", builtin_jobs},
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{"export", "Set environment variable", builtin_export},
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{"unset", "Unset environment variable", builtin_unset},
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{"read", "Input environment variable", builtin_read},
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{".", "Source-in and run commands in a file", builtin_source},
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/* to do: add ulimit */
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{NULL, NULL, NULL}
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};
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/* Table of forking built-in functions (things that fork cannot change global
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* variables in the parent process, such as the current working directory) */
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static struct built_in_command bltins_forking[] = {
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{"pwd", "Print current directory", builtin_pwd},
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{"help", "List shell built-in commands", builtin_help},
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{NULL, NULL, NULL}
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};
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static int shell_context; /* Type prompt trigger (PS1 or PS2) */
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/* Globals that are static to this file */
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static const char *cwd;
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static char *local_pending_command;
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static struct jobset job_list = { NULL, NULL };
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static int argc;
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static char **argv;
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static llist_t *close_me_list;
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static int last_return_code;
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static int last_bg_pid;
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static unsigned int last_jobid;
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static int shell_terminal;
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static char *PS1;
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static char *PS2 = "> ";
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#ifdef DEBUG_SHELL
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static inline void debug_printf(const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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vfprintf(stderr, format, args);
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va_end(args);
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}
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#else
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static inline void debug_printf(const char ATTRIBUTE_UNUSED *format, ...) { }
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#endif
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/*
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Most builtins need access to the struct child_prog that has
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their arguments, previously coded as cmd->progs[0]. That coding
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can exhibit a bug, if the builtin is not the first command in
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a pipeline: "echo foo | exec sort" will attempt to exec foo.
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builtin previous use notes
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------ ----------------- ---------
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cd cmd->progs[0]
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exec cmd->progs[0] squashed bug: didn't look for applets or forking builtins
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exit cmd->progs[0]
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fg_bg cmd->progs[0], job_list->head, job_list->fg
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help 0
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jobs job_list->head
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pwd 0
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export cmd->progs[0]
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source cmd->progs[0]
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unset cmd->progs[0]
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read cmd->progs[0]
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I added "struct job *family;" to struct child_prog,
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and switched API to builtin_foo(struct child_prog *child);
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So cmd->text becomes child->family->text
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cmd->job_context becomes child->family->job_context
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cmd->progs[0] becomes *child
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job_list becomes child->family->job_list
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*/
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/* built-in 'cd <path>' handler */
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static int builtin_cd(struct child_prog *child)
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{
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char *newdir;
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if (child->argv[1] == NULL)
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newdir = getenv("HOME");
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else
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newdir = child->argv[1];
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if (chdir(newdir)) {
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bb_perror_msg("cd: %s", newdir);
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return EXIT_FAILURE;
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}
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cwd = xgetcwd((char *)cwd);
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if (!cwd)
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cwd = bb_msg_unknown;
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return EXIT_SUCCESS;
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}
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/* built-in 'exec' handler */
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static int builtin_exec(struct child_prog *child)
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{
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if (child->argv[1] == NULL)
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return EXIT_SUCCESS; /* Really? */
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child->argv++;
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while(close_me_list) close((long)llist_pop(&close_me_list));
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pseudo_exec(child);
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/* never returns */
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}
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/* built-in 'exit' handler */
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static int builtin_exit(struct child_prog *child)
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{
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if (child->argv[1] == NULL)
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exit(EXIT_SUCCESS);
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exit (atoi(child->argv[1]));
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}
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/* built-in 'fg' and 'bg' handler */
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static int builtin_fg_bg(struct child_prog *child)
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{
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int i, jobnum;
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struct job *job=NULL;
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/* If they gave us no args, assume they want the last backgrounded task */
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if (!child->argv[1]) {
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for (job = child->family->job_list->head; job; job = job->next) {
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if (job->jobid == last_jobid) {
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break;
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}
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}
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if (!job) {
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bb_error_msg("%s: no current job", child->argv[0]);
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return EXIT_FAILURE;
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}
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} else {
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if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
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bb_error_msg(bb_msg_invalid_arg, child->argv[1], child->argv[0]);
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return EXIT_FAILURE;
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}
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for (job = child->family->job_list->head; job; job = job->next) {
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if (job->jobid == jobnum) {
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break;
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}
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}
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if (!job) {
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bb_error_msg("%s: %d: no such job", child->argv[0], jobnum);
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return EXIT_FAILURE;
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}
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}
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if (*child->argv[0] == 'f') {
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/* Put the job into the foreground. */
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tcsetpgrp(shell_terminal, job->pgrp);
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child->family->job_list->fg = job;
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}
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/* Restart the processes in the job */
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for (i = 0; i < job->num_progs; i++)
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job->progs[i].is_stopped = 0;
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job->stopped_progs = 0;
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if ( (i=kill(- job->pgrp, SIGCONT)) < 0) {
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if (i == ESRCH) {
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remove_job(&job_list, job);
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} else {
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bb_perror_msg("kill (SIGCONT)");
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}
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}
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return EXIT_SUCCESS;
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}
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/* built-in 'help' handler */
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static int builtin_help(struct child_prog ATTRIBUTE_UNUSED *dummy)
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{
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struct built_in_command *x;
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printf("\nBuilt-in commands:\n"
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"-------------------\n");
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for (x = bltins; x->cmd; x++) {
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if (x->descr==NULL)
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continue;
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printf("%s\t%s\n", x->cmd, x->descr);
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}
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for (x = bltins_forking; x->cmd; x++) {
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if (x->descr==NULL)
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continue;
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printf("%s\t%s\n", x->cmd, x->descr);
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}
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putchar('\n');
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return EXIT_SUCCESS;
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}
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/* built-in 'jobs' handler */
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static int builtin_jobs(struct child_prog *child)
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{
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struct job *job;
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char *status_string;
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for (job = child->family->job_list->head; job; job = job->next) {
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if (job->running_progs == job->stopped_progs)
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status_string = "Stopped";
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else
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status_string = "Running";
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printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
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}
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return EXIT_SUCCESS;
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}
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/* built-in 'pwd' handler */
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static int builtin_pwd(struct child_prog ATTRIBUTE_UNUSED *dummy)
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{
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cwd = xgetcwd((char *)cwd);
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if (!cwd)
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cwd = bb_msg_unknown;
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puts(cwd);
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return EXIT_SUCCESS;
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}
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/* built-in 'export VAR=value' handler */
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static int builtin_export(struct child_prog *child)
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{
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int res;
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char *v = child->argv[1];
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if (v == NULL) {
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char **e;
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for (e = environ; *e; e++) {
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puts(*e);
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}
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return 0;
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}
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res = putenv(v);
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if (res)
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bb_perror_msg("export");
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#ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
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if (strncmp(v, "PS1=", 4)==0)
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PS1 = getenv("PS1");
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#endif
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#ifdef CONFIG_LOCALE_SUPPORT
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// TODO: why getenv? "" would be just as good...
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if(strncmp(v, "LC_ALL=", 7)==0)
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setlocale(LC_ALL, getenv("LC_ALL"));
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if(strncmp(v, "LC_CTYPE=", 9)==0)
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setlocale(LC_CTYPE, getenv("LC_CTYPE"));
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#endif
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return res;
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}
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/* built-in 'read VAR' handler */
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static int builtin_read(struct child_prog *child)
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{
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int res = 0, len;
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char *s;
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char string[MAX_READ];
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if (child->argv[1]) {
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/* argument (VAR) given: put "VAR=" into buffer */
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safe_strncpy(string, child->argv[1], MAX_READ-1);
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len = strlen(string);
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string[len++] = '=';
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string[len] = '\0';
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fgets(&string[len], sizeof(string) - len, stdin); /* read string */
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res = strlen(string);
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if (res > len)
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string[--res] = '\0'; /* chomp trailing newline */
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/*
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** string should now contain "VAR=<value>"
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** copy it (putenv() won't do that, so we must make sure
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** the string resides in a static buffer!)
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*/
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res = -1;
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if ((s = strdup(string)))
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res = putenv(s);
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if (res)
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bb_perror_msg("read");
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}
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else
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fgets(string, sizeof(string), stdin);
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return res;
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}
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/* Built-in '.' handler (read-in and execute commands from file) */
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static int builtin_source(struct child_prog *child)
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{
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FILE *input;
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int status;
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input = fopen_or_warn(child->argv[1], "r");
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if (!input) {
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return EXIT_FAILURE;
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}
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llist_add_to(&close_me_list, (void *)(long)fileno(input));
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/* Now run the file */
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status = busy_loop(input);
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fclose(input);
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llist_pop(&close_me_list);
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return status;
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}
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/* built-in 'unset VAR' handler */
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static int builtin_unset(struct child_prog *child)
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{
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if (child->argv[1] == NULL) {
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printf(bb_msg_requires_arg, "unset");
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return EXIT_FAILURE;
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}
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unsetenv(child->argv[1]);
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return EXIT_SUCCESS;
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}
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#ifdef CONFIG_LASH_JOB_CONTROL
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/* free up all memory from a job */
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static void free_job(struct job *cmd)
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{
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int i;
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struct jobset *keep;
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for (i = 0; i < cmd->num_progs; i++) {
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free(cmd->progs[i].argv);
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#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
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if (cmd->progs[i].redirects)
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free(cmd->progs[i].redirects);
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#endif
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}
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free(cmd->progs);
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free(cmd->text);
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free(cmd->cmdbuf);
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keep = cmd->job_list;
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memset(cmd, 0, sizeof(struct job));
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cmd->job_list = keep;
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}
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/* remove a job from a jobset */
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static void remove_job(struct jobset *j_list, struct job *job)
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{
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struct job *prevjob;
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free_job(job);
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if (job == j_list->head) {
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j_list->head = job->next;
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} else {
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prevjob = j_list->head;
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while (prevjob->next != job)
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prevjob = prevjob->next;
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prevjob->next = job->next;
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}
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if (j_list->head)
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last_jobid = j_list->head->jobid;
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else
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last_jobid = 0;
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free(job);
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}
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|
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/* 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)
|
|
{
|
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struct job *job;
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pid_t childpid;
|
|
int status;
|
|
int prognum = 0;
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|
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while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
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for (job = j_list->head; job; job = job->next) {
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prognum = 0;
|
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while (prognum < job->num_progs &&
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job->progs[prognum].pid != childpid) prognum++;
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if (prognum < job->num_progs)
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break;
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}
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|
|
/* This happens on backticked commands */
|
|
if(job==NULL)
|
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return;
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|
|
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);
|
|
last_jobid=0;
|
|
remove_job(j_list, job);
|
|
}
|
|
} else {
|
|
/* child stopped */
|
|
job->stopped_progs++;
|
|
job->progs[prognum].is_stopped = 1;
|
|
}
|
|
}
|
|
|
|
if (childpid == -1 && errno != ECHILD)
|
|
bb_perror_msg("waitpid");
|
|
}
|
|
#else
|
|
static void checkjobs(struct jobset *j_list)
|
|
{
|
|
}
|
|
static void free_job(struct job *cmd)
|
|
{
|
|
}
|
|
static void remove_job(struct jobset *j_list, struct job *job)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
|
|
/* 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!) */
|
|
bb_perror_msg("error opening %s", redir->filename);
|
|
return 1;
|
|
}
|
|
|
|
if (openfd != redir->fd) {
|
|
if (squirrel && redir->fd < 3) {
|
|
squirrel[redir->fd] = dup(redir->fd);
|
|
fcntl (squirrel[redir->fd], F_SETFD, FD_CLOEXEC);
|
|
}
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
#else
|
|
static inline int setup_redirects(struct child_prog *prog, int squirrel[])
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void restore_redirects(int squirrel[])
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline void cmdedit_set_initial_prompt(void)
|
|
{
|
|
#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
|
|
PS1 = NULL;
|
|
#else
|
|
PS1 = getenv("PS1");
|
|
if(PS1==0)
|
|
PS1 = "\\w \\$ ";
|
|
#endif
|
|
}
|
|
|
|
static inline void setup_prompt_string(char **prompt_str)
|
|
{
|
|
#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
|
|
/* Set up the prompt */
|
|
if (shell_context == 0) {
|
|
free(PS1);
|
|
PS1=xmalloc(strlen(cwd)+4);
|
|
sprintf(PS1, "%s %c ", 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 CONFIG_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);
|
|
return 0;
|
|
#else
|
|
fputs(prompt_str, stdout);
|
|
#endif
|
|
}
|
|
|
|
if (!fgets(command, BUFSIZ - 2, source)) {
|
|
if (source == stdin)
|
|
puts("");
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char * strsep_space( char *string, int * ix)
|
|
{
|
|
/* Short circuit the trivial case */
|
|
if ( !string || ! string[*ix])
|
|
return NULL;
|
|
|
|
/* Find the end of the token. */
|
|
while (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[*ix] && (isspace)(string[*ix]) ) {
|
|
(*ix)++;
|
|
}
|
|
|
|
if (!*ix) {
|
|
/* Nothing useful was found */
|
|
return NULL;
|
|
}
|
|
|
|
return xstrndup(string, *ix);
|
|
}
|
|
|
|
static int expand_arguments(char *command)
|
|
{
|
|
int total_length=0, length, i, retval, ix = 0;
|
|
expand_t expand_result;
|
|
char *tmpcmd, *cmd, *cmd_copy;
|
|
char *src, *dst, *var;
|
|
const char * const out_of_space = "out of space during expansion";
|
|
int flags = GLOB_NOCHECK
|
|
#ifdef GLOB_BRACE
|
|
| GLOB_BRACE
|
|
#endif
|
|
#ifdef GLOB_TILDE
|
|
| GLOB_TILDE
|
|
#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] = bb_process_escape_sequence( &tmp );
|
|
memmove(command+ix + 1, tmp, strlen(tmp)+1);
|
|
}
|
|
ix++;
|
|
}
|
|
/* Use glob and then fixup environment variables and such */
|
|
|
|
/* 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) */
|
|
|
|
/* 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 = xstrdup(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);
|
|
bb_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. */
|
|
bb_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) {
|
|
bb_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);
|
|
|
|
/* 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+1;
|
|
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) {
|
|
bb_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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
int argc_l;
|
|
int flag;
|
|
int argv_alloced;
|
|
char quote = '\0';
|
|
struct child_prog *prog;
|
|
#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
|
|
int i;
|
|
char *chptr;
|
|
#endif
|
|
|
|
/* skip leading white space */
|
|
*command_ptr = skip_whitespace(*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 = xzalloc(2*strlen(*command_ptr) + 1);
|
|
job->text = NULL;
|
|
|
|
prog = job->progs;
|
|
prog->num_redirects = 0;
|
|
prog->is_stopped = 0;
|
|
prog->family = job;
|
|
#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
|
|
prog->redirects = NULL;
|
|
#endif
|
|
|
|
argv_alloced = 5;
|
|
prog->argv = xmalloc(sizeof(*prog->argv) * argv_alloced);
|
|
prog->argv[0] = job->cmdbuf;
|
|
|
|
flag = argc_l = 0;
|
|
buf = command;
|
|
src = *command_ptr;
|
|
while (*src && !(flag & LASH_OPT_DONE)) {
|
|
if (quote == *src) {
|
|
quote = '\0';
|
|
} else if (quote) {
|
|
if (*src == '\\') {
|
|
src++;
|
|
if (!*src) {
|
|
bb_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] || flag & LASH_OPT_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;
|
|
flag ^= LASH_OPT_SAW_QUOTE;
|
|
}
|
|
} else
|
|
switch (*src) {
|
|
case '"':
|
|
case '\'':
|
|
quote = *src;
|
|
flag |= LASH_OPT_SAW_QUOTE;
|
|
break;
|
|
|
|
case '#': /* comment */
|
|
if (*(src-1)== '$')
|
|
*buf++ = *src;
|
|
else
|
|
flag |= LASH_OPT_DONE;
|
|
break;
|
|
|
|
#ifdef CONFIG_LASH_PIPE_N_REDIRECTS
|
|
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;
|
|
chptr = skip_whitespace(chptr);
|
|
|
|
if (!*chptr) {
|
|
bb_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] || flag & LASH_OPT_SAW_QUOTE)
|
|
argc_l++;
|
|
if (!argc_l) {
|
|
goto empty_command_in_pipe;
|
|
}
|
|
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++;
|
|
src = skip_whitespace(src);
|
|
|
|
if (!*src) {
|
|
empty_command_in_pipe:
|
|
bb_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;
|
|
#endif
|
|
|
|
#ifdef CONFIG_LASH_JOB_CONTROL
|
|
case '&': /* background */
|
|
*inbg = 1;
|
|
/* fallthrough */
|
|
#endif
|
|
case ';': /* multiple commands */
|
|
flag |= LASH_OPT_DONE;
|
|
return_command = *command_ptr + (src - *command_ptr) + 1;
|
|
break;
|
|
|
|
case '\\':
|
|
src++;
|
|
if (!*src) {
|
|
bb_error_msg("character expected after \\");
|
|
free_job(job);
|
|
return 1;
|
|
}
|
|
if (*src == '*' || *src == '[' || *src == ']'
|
|
|| *src == '?') *buf++ = '\\';
|
|
/* fallthrough */
|
|
default:
|
|
*buf++ = *src;
|
|
}
|
|
|
|
src++;
|
|
}
|
|
|
|
if (*prog->argv[argc_l] || flag & LASH_OPT_SAW_QUOTE) {
|
|
argc_l++;
|
|
}
|
|
if (!argc_l) {
|
|
free_job(job);
|
|
return 0;
|
|
}
|
|
prog->argv[argc_l] = NULL;
|
|
|
|
if (!return_command) {
|
|
job->text = xstrdup(*command_ptr);
|
|
} else {
|
|
/* This leaves any trailing spaces, which is a bit sloppy */
|
|
job->text = xstrndup(*command_ptr, return_command - *command_ptr);
|
|
}
|
|
|
|
*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;
|
|
|
|
/* 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));
|
|
}
|
|
}
|
|
|
|
/* Check if the command matches any busybox internal
|
|
* commands ("applets") here. Following discussions from
|
|
* November 2000 on busybox@busybox.net, don't use
|
|
* bb_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.
|
|
*/
|
|
|
|
if (ENABLE_FEATURE_SH_STANDALONE_SHELL) {
|
|
char **argv_l = child->argv;
|
|
int argc_l;
|
|
|
|
for (argc_l=0; *argv_l; argv_l++, argc_l++);
|
|
optind = 1;
|
|
run_applet_by_name(child->argv[0], argc_l, child->argv);
|
|
}
|
|
|
|
execvp(child->argv[0], child->argv);
|
|
|
|
/* Do not use bb_perror_msg_and_die() here, since we must not
|
|
* call exit() but should call _exit() instead */
|
|
bb_perror_msg("%s", child->argv[0]);
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
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;
|
|
|
|
#ifdef CONFIG_LASH_JOB_CONTROL
|
|
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);
|
|
last_jobid = newjob->jobid;
|
|
last_bg_pid=newjob->progs[newjob->num_progs - 1].pid;
|
|
} else {
|
|
newjob->job_list->fg = thejob;
|
|
|
|
/* move the new process group into the foreground */
|
|
/* Ignore errors since child could have already exited */
|
|
tcsetpgrp(shell_terminal, newjob->pgrp);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
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) bb_perror_msg_and_die("pipe");
|
|
nextout = pipefds[1];
|
|
} else {
|
|
if (outpipe[1]!=-1) {
|
|
nextout = outpipe[1];
|
|
} else {
|
|
nextout = 1;
|
|
}
|
|
}
|
|
|
|
|
|
/* 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) {
|
|
/* Check if the command sets an environment variable. */
|
|
if (strchr(child->argv[0], '=') != NULL) {
|
|
child->argv[1] = child->argv[0];
|
|
return builtin_export(child);
|
|
}
|
|
|
|
for (x = bltins; x->cmd; x++) {
|
|
if (strcmp(child->argv[0], x->cmd) == 0 ) {
|
|
int rcode;
|
|
int squirrel[] = {-1, -1, -1};
|
|
setup_redirects(child, squirrel);
|
|
rcode = x->function(child);
|
|
restore_redirects(squirrel);
|
|
return rcode;
|
|
}
|
|
}
|
|
}
|
|
|
|
#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
|
|
if (!(child->pid = fork()))
|
|
#else
|
|
if (!(child->pid = vfork()))
|
|
#endif
|
|
{
|
|
/* Set the handling for job control signals back to the default. */
|
|
signal(SIGINT, SIG_DFL);
|
|
signal(SIGQUIT, SIG_DFL);
|
|
signal(SIGTSTP, SIG_DFL);
|
|
signal(SIGTTIN, SIG_DFL);
|
|
signal(SIGTTOU, SIG_DFL);
|
|
signal(SIGCHLD, SIG_DFL);
|
|
|
|
/* Close all open filehandles. */
|
|
while(close_me_list) close((long)llist_pop(&close_me_list));
|
|
|
|
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;
|
|
int i;
|
|
int inbg = 0;
|
|
int status;
|
|
#ifdef CONFIG_LASH_JOB_CONTROL
|
|
pid_t parent_pgrp;
|
|
/* save current owner of TTY so we can restore it on exit */
|
|
parent_pgrp = tcgetpgrp(shell_terminal);
|
|
#endif
|
|
newjob.job_list = &job_list;
|
|
newjob.job_context = DEFAULT_CONTEXT;
|
|
|
|
command = xzalloc(BUFSIZ);
|
|
|
|
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)) {
|
|
free(command);
|
|
command = xzalloc(BUFSIZ);
|
|
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 = xzalloc(BUFSIZ);
|
|
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) {
|
|
if (errno != ECHILD) {
|
|
bb_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;
|
|
|
|
last_return_code=WEXITSTATUS(status);
|
|
|
|
if (!job_list.fg->running_progs) {
|
|
/* child exited */
|
|
remove_job(&job_list, job_list.fg);
|
|
job_list.fg = NULL;
|
|
}
|
|
}
|
|
#ifdef CONFIG_LASH_JOB_CONTROL
|
|
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(shell_terminal, getpgrp()) && errno != ENOTTY)
|
|
bb_perror_msg("tcsetpgrp");
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
free(command);
|
|
|
|
#ifdef CONFIG_LASH_JOB_CONTROL
|
|
/* return controlling TTY back to parent process group before exiting */
|
|
if (tcsetpgrp(shell_terminal, parent_pgrp) && errno != ENOTTY)
|
|
bb_perror_msg("tcsetpgrp");
|
|
#endif
|
|
|
|
/* return exit status if called with "-c" */
|
|
if (input == NULL && WIFEXITED(status))
|
|
return WEXITSTATUS(status);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_CLEAN_UP
|
|
static void free_memory(void)
|
|
{
|
|
if (cwd && cwd!=bb_msg_unknown) {
|
|
free((char*)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);
|
|
}
|
|
}
|
|
#else
|
|
void free_memory(void);
|
|
#endif
|
|
|
|
#ifdef CONFIG_LASH_JOB_CONTROL
|
|
/* Make sure we have a controlling tty. If we get started under a job
|
|
* aware app (like bash for example), make sure we are now in charge so
|
|
* we don't fight over who gets the foreground */
|
|
static void setup_job_control(void)
|
|
{
|
|
int status;
|
|
pid_t shell_pgrp;
|
|
|
|
/* Loop until we are in the foreground. */
|
|
while ((status = tcgetpgrp (shell_terminal)) >= 0) {
|
|
if (status == (shell_pgrp = getpgrp ())) {
|
|
break;
|
|
}
|
|
kill (- shell_pgrp, SIGTTIN);
|
|
}
|
|
|
|
/* Ignore interactive and job-control signals. */
|
|
signal(SIGINT, SIG_IGN);
|
|
signal(SIGQUIT, SIG_IGN);
|
|
signal(SIGTSTP, SIG_IGN);
|
|
signal(SIGTTIN, SIG_IGN);
|
|
signal(SIGTTOU, SIG_IGN);
|
|
signal(SIGCHLD, SIG_IGN);
|
|
|
|
/* Put ourselves in our own process group. */
|
|
setsid();
|
|
shell_pgrp = getpid ();
|
|
setpgid(shell_pgrp, shell_pgrp);
|
|
|
|
/* Grab control of the terminal. */
|
|
tcsetpgrp(shell_terminal, shell_pgrp);
|
|
}
|
|
#else
|
|
static inline void setup_job_control(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
int lash_main(int argc_l, char **argv_l)
|
|
{
|
|
unsigned opt;
|
|
FILE *input = stdin;
|
|
argc = argc_l;
|
|
argv = argv_l;
|
|
|
|
/* These variables need re-initializing when recursing */
|
|
last_jobid = 0;
|
|
close_me_list = NULL;
|
|
job_list.head = NULL;
|
|
job_list.fg = NULL;
|
|
last_return_code=1;
|
|
|
|
if (argv[0] && argv[0][0] == '-') {
|
|
FILE *prof_input;
|
|
prof_input = fopen("/etc/profile", "r");
|
|
if (prof_input) {
|
|
llist_add_to(&close_me_list, (void *)(long)fileno(prof_input));
|
|
/* Now run the file */
|
|
busy_loop(prof_input);
|
|
fclose_if_not_stdin(prof_input);
|
|
llist_pop(&close_me_list);
|
|
}
|
|
}
|
|
|
|
opt = getopt32(argc_l, argv_l, "+ic:", &local_pending_command);
|
|
#define LASH_OPT_i (1<<0)
|
|
#define LASH_OPT_c (1<<2)
|
|
if (opt & LASH_OPT_c) {
|
|
input = NULL;
|
|
optind++;
|
|
argv += optind;
|
|
}
|
|
/* 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(STDIN_FILENO) && isatty(STDOUT_FILENO))
|
|
{
|
|
opt |= LASH_OPT_i;
|
|
}
|
|
setup_job_control();
|
|
if (opt & LASH_OPT_i) {
|
|
/* Looks like they want an interactive shell */
|
|
if (!ENABLE_FEATURE_SH_EXTRA_QUIET) {
|
|
printf("\n\n%s Built-in shell (lash)\n"
|
|
"Enter 'help' for a list of built-in commands.\n\n",
|
|
BB_BANNER);
|
|
}
|
|
} else if (!local_pending_command && argv[optind]) {
|
|
//printf( "optind=%d argv[optind]='%s'\n", optind, argv[optind]);
|
|
input = xfopen(argv[optind], "r");
|
|
/* be lazy, never mark this closed */
|
|
llist_add_to(&close_me_list, (void *)(long)fileno(input));
|
|
}
|
|
|
|
/* initialize the cwd -- this is never freed...*/
|
|
cwd = xgetcwd(0);
|
|
if (!cwd)
|
|
cwd = bb_msg_unknown;
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP) atexit(free_memory);
|
|
|
|
if (ENABLE_FEATURE_COMMAND_EDITING) cmdedit_set_initial_prompt();
|
|
else PS1 = NULL;
|
|
|
|
return (busy_loop(input));
|
|
}
|