mirror of
https://github.com/sheumann/hush.git
synced 2024-08-18 21:29:23 +00:00
1009 lines
24 KiB
C
1009 lines
24 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) 2000 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <glob.h>
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#include <signal.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#ifdef BB_FEATURE_SH_COMMAND_EDITING
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#include "cmdedit.h"
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#endif
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#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
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enum redirectionType { REDIRECT_INPUT, REDIRECT_OVERWRITE,
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REDIRECT_APPEND
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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 redirectionSpecifier {
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enum redirectionType 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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struct childProgram {
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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 numRedirections; /* elements in redirection array */
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struct redirectionSpecifier *redirections; /* I/O redirections */
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glob_t globResult; /* result of parameter globbing */
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int freeGlob; /* should we globfree(&globResult)? */
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int isStopped; /* is the program currently running? */
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};
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struct job {
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int jobId; /* job number */
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int numProgs; /* total number of programs in job */
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int runningProgs; /* 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 childProgram *progs; /* array of programs in job */
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struct job *next; /* to track background commands */
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int stoppedProgs; /* number of programs alive, but stopped */
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};
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struct builtInCommand {
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char *cmd; /* name */
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char *descr; /* description */
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char *usage; /* usage */
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int (*function) (struct job *, struct jobSet * jobList); /* function ptr */
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};
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/* Some function prototypes */
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static int shell_cd(struct job *cmd, struct jobSet *junk);
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static int shell_env(struct job *dummy, struct jobSet *junk);
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static int shell_exit(struct job *cmd, struct jobSet *junk);
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static int shell_fg_bg(struct job *cmd, struct jobSet *jobList);
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static int shell_help(struct job *cmd, struct jobSet *junk);
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static int shell_jobs(struct job *dummy, struct jobSet *jobList);
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static int shell_pwd(struct job *dummy, struct jobSet *junk);
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static int shell_export(struct job *cmd, struct jobSet *junk);
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static int shell_source(struct job *cmd, struct jobSet *jobList);
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static int shell_unset(struct job *cmd, struct jobSet *junk);
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static void checkJobs(struct jobSet *jobList);
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static int getCommand(FILE * source, char *command);
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static int parseCommand(char **commandPtr, struct job *job, int *isBg);
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static int setupRedirections(struct childProgram *prog);
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static int runCommand(struct job newJob, struct jobSet *jobList, int inBg);
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static int busy_loop(FILE * input);
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/* Table of built-in functions */
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static struct builtInCommand bltins[] = {
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{"bg", "Resume a job in the background", "bg [%%job]", shell_fg_bg},
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{"cd", "Change working directory", "cd [dir]", shell_cd},
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{"exit", "Exit from shell()", "exit", shell_exit},
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{"fg", "Bring job into the foreground", "fg [%%job]", shell_fg_bg},
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{"jobs", "Lists the active jobs", "jobs", shell_jobs},
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{"export", "Set environment variable", "export [VAR=value]", shell_export},
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{"unset", "Unset environment variable", "unset VAR", shell_unset},
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{NULL, NULL, NULL, NULL}
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};
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/* Table of built-in functions */
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static struct builtInCommand bltins_forking[] = {
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{"env", "Print all environment variables", "env", shell_env},
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{"pwd", "Print current directory", "pwd", shell_pwd},
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{".", "Source-in and run commands in a file", ". filename", shell_source},
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{"help", "List shell built-in commands", "help", shell_help},
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{NULL, NULL, NULL, NULL}
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};
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static const char shell_usage[] =
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"sh [FILE]...\n"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\nlash: The BusyBox command interpreter (shell).\n\n"
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#endif
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;
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static char cwd[1024];
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static char *prompt = "# ";
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#ifdef BB_FEATURE_SH_COMMAND_EDITING
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void win_changed(int sig)
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{
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struct winsize win = { 0, 0 };
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ioctl(0, TIOCGWINSZ, &win);
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if (win.ws_col > 0) {
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cmdedit_setwidth( win.ws_col - 1);
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}
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}
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#endif
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/* built-in 'cd <path>' handler */
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static int shell_cd(struct job *cmd, struct jobSet *junk)
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{
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char *newdir;
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if (!cmd->progs[0].argv[1] == 1)
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newdir = getenv("HOME");
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else
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newdir = cmd->progs[0].argv[1];
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if (chdir(newdir)) {
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printf("cd: %s: %s\n", newdir, strerror(errno));
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return FALSE;
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}
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getcwd(cwd, sizeof(cwd));
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return TRUE;
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}
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/* built-in 'env' handler */
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static int shell_env(struct job *dummy, struct jobSet *junk)
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{
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char **e;
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for (e = environ; *e; e++) {
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fprintf(stdout, "%s\n", *e);
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}
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return (0);
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}
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/* built-in 'exit' handler */
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static int shell_exit(struct job *cmd, struct jobSet *junk)
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{
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if (!cmd->progs[0].argv[1] == 1)
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exit TRUE;
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else
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exit(atoi(cmd->progs[0].argv[1]));
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}
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/* built-in 'fg' and 'bg' handler */
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static int shell_fg_bg(struct job *cmd, struct jobSet *jobList)
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{
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int i, jobNum;
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struct job *job=NULL;
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if (!jobList->head) {
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if (!cmd->progs[0].argv[1] || cmd->progs[0].argv[2]) {
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fprintf(stderr, "%s: exactly one argument is expected\n",
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cmd->progs[0].argv[0]);
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return FALSE;
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}
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if (sscanf(cmd->progs[0].argv[1], "%%%d", &jobNum) != 1) {
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fprintf(stderr, "%s: bad argument '%s'\n",
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cmd->progs[0].argv[0], cmd->progs[0].argv[1]);
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return FALSE;
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for (job = jobList->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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}
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} else {
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job = jobList->head;
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}
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if (!job) {
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fprintf(stderr, "%s: unknown job %d\n",
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cmd->progs[0].argv[0], jobNum);
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return FALSE;
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}
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if (*cmd->progs[0].argv[0] == 'f') {
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/* Make this job the foreground job */
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if (tcsetpgrp(0, job->pgrp))
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perror("tcsetpgrp");
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jobList->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->numProgs; i++)
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job->progs[i].isStopped = 0;
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kill(-job->pgrp, SIGCONT);
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job->stoppedProgs = 0;
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return TRUE;
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}
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/* built-in 'help' handler */
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static int shell_help(struct job *cmd, struct jobSet *junk)
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{
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struct builtInCommand *x;
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fprintf(stdout, "\nBuilt-in commands:\n");
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fprintf(stdout, "-------------------\n");
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for (x = bltins; x->cmd; x++) {
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fprintf(stdout, "%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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fprintf(stdout, "%s\t%s\n", x->cmd, x->descr);
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}
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fprintf(stdout, "\n\n");
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return TRUE;
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}
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/* built-in 'jobs' handler */
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static int shell_jobs(struct job *dummy, struct jobSet *jobList)
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{
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struct job *job;
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char *statusString;
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for (job = jobList->head; job; job = job->next) {
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if (job->runningProgs == job->stoppedProgs)
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statusString = "Stopped";
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else
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statusString = "Running";
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printf(JOB_STATUS_FORMAT, job->jobId, statusString, job->text);
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}
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return TRUE;
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}
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/* built-in 'pwd' handler */
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static int shell_pwd(struct job *dummy, struct jobSet *junk)
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{
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getcwd(cwd, sizeof(cwd));
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fprintf(stdout, "%s\n", cwd);
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return TRUE;
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}
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/* built-in 'export VAR=value' handler */
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static int shell_export(struct job *cmd, struct jobSet *junk)
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{
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int res;
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if (!cmd->progs[0].argv[1] == 1) {
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return (shell_env(cmd, junk));
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}
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res = putenv(cmd->progs[0].argv[1]);
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if (res)
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fprintf(stdout, "export: %s\n", strerror(errno));
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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 shell_source(struct job *cmd, struct jobSet *junk)
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{
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FILE *input;
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int status;
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if (!cmd->progs[0].argv[1] == 1)
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return FALSE;
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input = fopen(cmd->progs[0].argv[1], "r");
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if (!input) {
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fprintf(stdout, "Couldn't open file '%s'\n",
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cmd->progs[0].argv[1]);
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return FALSE;
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}
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/* Now run the file */
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status = busy_loop(input);
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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 shell_unset(struct job *cmd, struct jobSet *junk)
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{
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if (!cmd->progs[0].argv[1] == 1) {
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fprintf(stdout, "unset: parameter required.\n");
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return FALSE;
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}
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unsetenv(cmd->progs[0].argv[1]);
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return TRUE;
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}
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/* free up all memory from a job */
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static void freeJob(struct job *cmd)
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{
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int i;
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for (i = 0; i < cmd->numProgs; i++) {
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free(cmd->progs[i].argv);
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if (cmd->progs[i].redirections)
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free(cmd->progs[i].redirections);
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if (cmd->progs[i].freeGlob)
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globfree(&cmd->progs[i].globResult);
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}
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free(cmd->progs);
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if (cmd->text)
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free(cmd->text);
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free(cmd->cmdBuf);
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}
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/* remove a job from the jobList */
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static void removeJob(struct jobSet *jobList, struct job *job)
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{
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struct job *prevJob;
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freeJob(job);
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if (job == jobList->head) {
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jobList->head = job->next;
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} else {
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prevJob = jobList->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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free(job);
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}
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/* Checks to see if any background processes have exited -- if they
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have, figure out why and see if a job has completed */
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static void checkJobs(struct jobSet *jobList)
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{
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struct job *job;
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pid_t childpid;
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int status;
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int progNum = 0;
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while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
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for (job = jobList->head; job; job = job->next) {
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progNum = 0;
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while (progNum < job->numProgs &&
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job->progs[progNum].pid != childpid) progNum++;
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if (progNum < job->numProgs)
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break;
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}
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if (WIFEXITED(status) || WIFSIGNALED(status)) {
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/* child exited */
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job->runningProgs--;
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job->progs[progNum].pid = 0;
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if (!job->runningProgs) {
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printf(JOB_STATUS_FORMAT, job->jobId, "Done", job->text);
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removeJob(jobList, job);
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}
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} else {
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/* child stopped */
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job->stoppedProgs++;
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job->progs[progNum].isStopped = 1;
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if (job->stoppedProgs == job->numProgs) {
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printf(JOB_STATUS_FORMAT, job->jobId, "Stopped",
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job->text);
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}
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}
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}
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if (childpid == -1 && errno != ECHILD)
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perror("waitpid");
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}
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static int getCommand(FILE * source, char *command)
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{
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if (source == stdin) {
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#ifdef BB_FEATURE_SH_COMMAND_EDITING
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int len;
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char *promptStr;
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len=fprintf(stdout, "%s %s", cwd, prompt);
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fflush(stdout);
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promptStr=(char*)malloc(sizeof(char)*(len+1));
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sprintf(promptStr, "%s %s", cwd, prompt);
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cmdedit_read_input(promptStr, command);
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free( promptStr);
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return 0;
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#else
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fprintf(stdout, "%s %s", cwd, prompt);
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fflush(stdout);
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#endif
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}
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if (!fgets(command, BUFSIZ - 2, source)) {
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if (source == stdin)
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printf("\n");
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return 1;
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}
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|
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/* remove trailing newline */
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command[strlen(command) - 1] = '\0';
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return 0;
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}
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static void globLastArgument(struct childProgram *prog, int *argcPtr,
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int *argcAllocedPtr)
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{
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|
int argc = *argcPtr;
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|
int argcAlloced = *argcAllocedPtr;
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|
int rc;
|
|
int flags;
|
|
int i;
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char *src, *dst;
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|
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if (argc > 1) { /* cmd->globResult is already initialized */
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flags = GLOB_APPEND;
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i = prog->globResult.gl_pathc;
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} else {
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prog->freeGlob = 1;
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flags = 0;
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i = 0;
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}
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|
|
|
rc = glob(prog->argv[argc - 1], flags, NULL, &prog->globResult);
|
|
if (rc == GLOB_NOSPACE) {
|
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fprintf(stderr, "out of space during glob operation\n");
|
|
return;
|
|
} else if (rc == GLOB_NOMATCH ||
|
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(!rc && (prog->globResult.gl_pathc - i) == 1 &&
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!strcmp(prog->argv[argc - 1],
|
|
prog->globResult.gl_pathv[i]))) {
|
|
/* we need to remove whatever \ quoting is still present */
|
|
src = dst = prog->argv[argc - 1];
|
|
while (*src) {
|
|
if (*src != '\\')
|
|
*dst++ = *src;
|
|
src++;
|
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}
|
|
*dst = '\0';
|
|
} else if (!rc) {
|
|
argcAlloced += (prog->globResult.gl_pathc - i);
|
|
prog->argv =
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|
realloc(prog->argv, argcAlloced * sizeof(*prog->argv));
|
|
memcpy(prog->argv + (argc - 1), prog->globResult.gl_pathv + i,
|
|
sizeof(*(prog->argv)) * (prog->globResult.gl_pathc - i));
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argc += (prog->globResult.gl_pathc - i - 1);
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}
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*argcAllocedPtr = argcAlloced;
|
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*argcPtr = argc;
|
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}
|
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|
|
/* Return cmd->numProgs as 0 if no command is present (e.g. an empty
|
|
line). If a valid command is found, commandPtr 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 parseCommand(char **commandPtr, struct job *job, int *isBg)
|
|
{
|
|
char *command;
|
|
char *returnCommand = NULL;
|
|
char *src, *buf, *chptr;
|
|
int argc = 0;
|
|
int done = 0;
|
|
int argvAlloced;
|
|
int i;
|
|
char quote = '\0';
|
|
int count;
|
|
struct childProgram *prog;
|
|
|
|
/* skip leading white space */
|
|
while (**commandPtr && isspace(**commandPtr))
|
|
(*commandPtr)++;
|
|
|
|
/* this handles empty lines or leading '#' characters */
|
|
if (!**commandPtr || (**commandPtr == '#')) {
|
|
job->numProgs = 0;
|
|
*commandPtr = NULL;
|
|
return 0;
|
|
}
|
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|
|
*isBg = 0;
|
|
job->numProgs = 1;
|
|
job->progs = malloc(sizeof(*job->progs));
|
|
|
|
/* We set the argv elements to point inside of this string. The
|
|
memory is freed by freeJob().
|
|
|
|
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 = calloc(1, strlen(*commandPtr) + 1);
|
|
job->text = NULL;
|
|
|
|
prog = job->progs;
|
|
prog->numRedirections = 0;
|
|
prog->redirections = NULL;
|
|
prog->freeGlob = 0;
|
|
prog->isStopped = 0;
|
|
|
|
argvAlloced = 5;
|
|
prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
|
|
prog->argv[0] = job->cmdBuf;
|
|
|
|
buf = command;
|
|
src = *commandPtr;
|
|
while (*src && !done) {
|
|
if (quote == *src) {
|
|
quote = '\0';
|
|
} else if (quote) {
|
|
if (*src == '\\') {
|
|
src++;
|
|
if (!*src) {
|
|
fprintf(stderr, "character expected after \\\n");
|
|
freeJob(job);
|
|
return 1;
|
|
}
|
|
|
|
/* in shell, "\'" should yield \' */
|
|
if (*src != quote)
|
|
*buf++ = '\\';
|
|
} else if (*src == '*' || *src == '?' || *src == '[' ||
|
|
*src == ']') *buf++ = '\\';
|
|
*buf++ = *src;
|
|
} else if (isspace(*src)) {
|
|
if (*prog->argv[argc]) {
|
|
buf++, argc++;
|
|
/* +1 here leaves room for the NULL which ends argv */
|
|
if ((argc + 1) == argvAlloced) {
|
|
argvAlloced += 5;
|
|
prog->argv = realloc(prog->argv,
|
|
sizeof(*prog->argv) *
|
|
argvAlloced);
|
|
}
|
|
prog->argv[argc] = buf;
|
|
|
|
globLastArgument(prog, &argc, &argvAlloced);
|
|
}
|
|
} else
|
|
switch (*src) {
|
|
case '"':
|
|
case '\'':
|
|
quote = *src;
|
|
break;
|
|
|
|
case '#': /* comment */
|
|
done = 1;
|
|
break;
|
|
|
|
case '>': /* redirections */
|
|
case '<':
|
|
i = prog->numRedirections++;
|
|
prog->redirections = realloc(prog->redirections,
|
|
sizeof(*prog->redirections) *
|
|
(i + 1));
|
|
|
|
prog->redirections[i].fd = -1;
|
|
if (buf != prog->argv[argc]) {
|
|
/* the stuff before this character may be the file number
|
|
being redirected */
|
|
prog->redirections[i].fd =
|
|
strtol(prog->argv[argc], &chptr, 10);
|
|
|
|
if (*chptr && *prog->argv[argc]) {
|
|
buf++, argc++;
|
|
globLastArgument(prog, &argc, &argvAlloced);
|
|
}
|
|
}
|
|
|
|
if (prog->redirections[i].fd == -1) {
|
|
if (*src == '>')
|
|
prog->redirections[i].fd = 1;
|
|
else
|
|
prog->redirections[i].fd = 0;
|
|
}
|
|
|
|
if (*src++ == '>') {
|
|
if (*src == '>')
|
|
prog->redirections[i].type =
|
|
REDIRECT_APPEND, src++;
|
|
else
|
|
prog->redirections[i].type = REDIRECT_OVERWRITE;
|
|
} else {
|
|
prog->redirections[i].type = REDIRECT_INPUT;
|
|
}
|
|
|
|
/* This isn't POSIX sh compliant. Oh well. */
|
|
chptr = src;
|
|
while (isspace(*chptr))
|
|
chptr++;
|
|
|
|
if (!*chptr) {
|
|
fprintf(stderr, "file name expected after %c\n", *src);
|
|
freeJob(job);
|
|
return 1;
|
|
}
|
|
|
|
prog->redirections[i].filename = buf;
|
|
while (*chptr && !isspace(*chptr))
|
|
*buf++ = *chptr++;
|
|
|
|
src = chptr - 1; /* we src++ later */
|
|
prog->argv[argc] = ++buf;
|
|
break;
|
|
|
|
case '|': /* pipe */
|
|
/* finish this command */
|
|
if (*prog->argv[argc])
|
|
argc++;
|
|
if (!argc) {
|
|
fprintf(stderr, "empty command in pipe\n");
|
|
freeJob(job);
|
|
return 1;
|
|
}
|
|
prog->argv[argc] = NULL;
|
|
|
|
/* and start the next */
|
|
job->numProgs++;
|
|
job->progs = realloc(job->progs,
|
|
sizeof(*job->progs) * job->numProgs);
|
|
prog = job->progs + (job->numProgs - 1);
|
|
prog->numRedirections = 0;
|
|
prog->redirections = NULL;
|
|
prog->freeGlob = 0;
|
|
argc = 0;
|
|
|
|
argvAlloced = 5;
|
|
prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
|
|
prog->argv[0] = ++buf;
|
|
|
|
src++;
|
|
while (*src && isspace(*src))
|
|
src++;
|
|
|
|
if (!*src) {
|
|
fprintf(stderr, "empty command in pipe\n");
|
|
return 1;
|
|
}
|
|
src--; /* we'll ++ it at the end of the loop */
|
|
|
|
break;
|
|
|
|
case '&': /* background */
|
|
*isBg = 1;
|
|
case ';': /* multiple commands */
|
|
done = 1;
|
|
returnCommand = *commandPtr + (src - *commandPtr) + 1;
|
|
break;
|
|
|
|
case '\\':
|
|
src++;
|
|
if (!*src) {
|
|
freeJob(job);
|
|
fprintf(stderr, "character expected after \\\n");
|
|
return 1;
|
|
}
|
|
if (*src == '*' || *src == '[' || *src == ']'
|
|
|| *src == '?') *buf++ = '\\';
|
|
/* fallthrough */
|
|
default:
|
|
*buf++ = *src;
|
|
}
|
|
|
|
src++;
|
|
}
|
|
|
|
if (*prog->argv[argc]) {
|
|
argc++;
|
|
globLastArgument(prog, &argc, &argvAlloced);
|
|
}
|
|
if (!argc) {
|
|
freeJob(job);
|
|
return 0;
|
|
}
|
|
prog->argv[argc] = NULL;
|
|
|
|
if (!returnCommand) {
|
|
job->text = malloc(strlen(*commandPtr) + 1);
|
|
strcpy(job->text, *commandPtr);
|
|
} else {
|
|
/* This leaves any trailing spaces, which is a bit sloppy */
|
|
count = returnCommand - *commandPtr;
|
|
job->text = malloc(count + 1);
|
|
strncpy(job->text, *commandPtr, count);
|
|
job->text[count] = '\0';
|
|
}
|
|
|
|
*commandPtr = returnCommand;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
|
|
{
|
|
struct job *job;
|
|
int i;
|
|
int nextin, nextout;
|
|
int pipefds[2]; /* pipefd[0] is for reading */
|
|
struct builtInCommand *x;
|
|
#ifdef BB_FEATURE_STANDALONE_SHELL
|
|
const struct BB_applet *a = applets;
|
|
#endif
|
|
|
|
|
|
nextin = 0, nextout = 1;
|
|
for (i = 0; i < newJob.numProgs; i++) {
|
|
if ((i + 1) < newJob.numProgs) {
|
|
pipe(pipefds);
|
|
nextout = pipefds[1];
|
|
} else {
|
|
nextout = 1;
|
|
}
|
|
|
|
/* Match any built-ins here */
|
|
for (x = bltins; x->cmd; x++) {
|
|
if (!strcmp(newJob.progs[i].argv[0], x->cmd)) {
|
|
return (x->function(&newJob, jobList));
|
|
}
|
|
}
|
|
|
|
if (!(newJob.progs[i].pid = fork())) {
|
|
signal(SIGTTOU, SIG_DFL);
|
|
|
|
if (nextin != 0) {
|
|
dup2(nextin, 0);
|
|
close(nextin);
|
|
}
|
|
|
|
if (nextout != 1) {
|
|
dup2(nextout, 1);
|
|
close(nextout);
|
|
}
|
|
|
|
/* explicit redirections override pipes */
|
|
setupRedirections(newJob.progs + i);
|
|
|
|
/* Match any built-ins here */
|
|
for (x = bltins_forking; x->cmd; x++) {
|
|
if (!strcmp(newJob.progs[i].argv[0], x->cmd)) {
|
|
exit (x->function(&newJob, jobList));
|
|
}
|
|
}
|
|
#ifdef BB_FEATURE_STANDALONE_SHELL
|
|
/* Handle busybox internals here */
|
|
while (a->name != 0) {
|
|
if (strcmp(newJob.progs[i].argv[0], a->name) == 0) {
|
|
int argc;
|
|
char** argv=newJob.progs[i].argv;
|
|
for(argc=0;*argv!=NULL; argv++, argc++);
|
|
exit((*(a->main)) (argc, newJob.progs[i].argv));
|
|
}
|
|
a++;
|
|
}
|
|
#endif
|
|
|
|
execvp(newJob.progs[i].argv[0], newJob.progs[i].argv);
|
|
fatalError("sh: %s: %s\n", newJob.progs[i].argv[0],
|
|
strerror(errno));
|
|
}
|
|
|
|
/* put our child in the process group whose leader is the
|
|
first process in this pipe */
|
|
setpgid(newJob.progs[i].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;
|
|
|
|
/* find the ID for the job to use */
|
|
newJob.jobId = 1;
|
|
for (job = jobList->head; job; job = job->next)
|
|
if (job->jobId >= newJob.jobId)
|
|
newJob.jobId = job->jobId + 1;
|
|
|
|
/* add the job to the list of running jobs */
|
|
if (!jobList->head) {
|
|
job = jobList->head = malloc(sizeof(*job));
|
|
} else {
|
|
for (job = jobList->head; job->next; job = job->next);
|
|
job->next = malloc(sizeof(*job));
|
|
job = job->next;
|
|
}
|
|
|
|
*job = newJob;
|
|
job->next = NULL;
|
|
job->runningProgs = job->numProgs;
|
|
job->stoppedProgs = 0;
|
|
|
|
if (inBg) {
|
|
/* we don't wait for background jobs to return -- append it
|
|
to the list of backgrounded jobs and leave it alone */
|
|
printf("[%d] %d\n", job->jobId,
|
|
newJob.progs[newJob.numProgs - 1].pid);
|
|
} else {
|
|
jobList->fg = job;
|
|
|
|
/* move the new process group into the foreground */
|
|
if (tcsetpgrp(0, newJob.pgrp))
|
|
perror("tcsetpgrp");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setupRedirections(struct childProgram *prog)
|
|
{
|
|
int i;
|
|
int openfd;
|
|
int mode = O_RDONLY;
|
|
struct redirectionSpecifier *redir = prog->redirections;
|
|
|
|
for (i = 0; i < prog->numRedirections; i++, redir++) {
|
|
switch (redir->type) {
|
|
case REDIRECT_INPUT:
|
|
mode = O_RDONLY;
|
|
break;
|
|
case REDIRECT_OVERWRITE:
|
|
mode = O_RDWR | O_CREAT | O_TRUNC;
|
|
break;
|
|
case REDIRECT_APPEND:
|
|
mode = O_RDWR | 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!) */
|
|
fprintf(stderr, "error opening %s: %s\n", redir->filename,
|
|
strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
if (openfd != redir->fd) {
|
|
dup2(openfd, redir->fd);
|
|
close(openfd);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int busy_loop(FILE * input)
|
|
{
|
|
char *command;
|
|
char *nextCommand = NULL;
|
|
struct jobSet jobList = { NULL, NULL };
|
|
struct job newJob;
|
|
int i;
|
|
int status;
|
|
int inBg;
|
|
|
|
command = (char *) calloc(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 (!jobList.fg) {
|
|
/* no job is in the foreground */
|
|
|
|
/* see if any background processes have exited */
|
|
checkJobs(&jobList);
|
|
|
|
if (!nextCommand) {
|
|
if (getCommand(input, command))
|
|
break;
|
|
nextCommand = command;
|
|
}
|
|
|
|
if (!parseCommand(&nextCommand, &newJob, &inBg) &&
|
|
newJob.numProgs) {
|
|
runCommand(newJob, &jobList, inBg);
|
|
}
|
|
} else {
|
|
/* a job is running in the foreground; wait for it */
|
|
i = 0;
|
|
while (!jobList.fg->progs[i].pid ||
|
|
jobList.fg->progs[i].isStopped) i++;
|
|
|
|
waitpid(jobList.fg->progs[i].pid, &status, WUNTRACED);
|
|
|
|
if (WIFEXITED(status) || WIFSIGNALED(status)) {
|
|
/* the child exited */
|
|
jobList.fg->runningProgs--;
|
|
jobList.fg->progs[i].pid = 0;
|
|
|
|
if (!jobList.fg->runningProgs) {
|
|
/* child exited */
|
|
|
|
removeJob(&jobList, jobList.fg);
|
|
jobList.fg = NULL;
|
|
|
|
/* move the shell to the foreground */
|
|
if (tcsetpgrp(0, getpid()))
|
|
perror("tcsetpgrp");
|
|
}
|
|
} else {
|
|
/* the child was stopped */
|
|
jobList.fg->stoppedProgs++;
|
|
jobList.fg->progs[i].isStopped = 1;
|
|
|
|
if (jobList.fg->stoppedProgs == jobList.fg->runningProgs) {
|
|
printf("\n" JOB_STATUS_FORMAT, jobList.fg->jobId,
|
|
"Stopped", jobList.fg->text);
|
|
jobList.fg = NULL;
|
|
}
|
|
}
|
|
|
|
if (!jobList.fg) {
|
|
/* move the shell to the foreground */
|
|
if (tcsetpgrp(0, getpid()))
|
|
perror("tcsetpgrp");
|
|
}
|
|
}
|
|
}
|
|
free(command);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int shell_main(int argc, char **argv)
|
|
{
|
|
FILE *input = stdin;
|
|
|
|
if (argc > 2) {
|
|
usage(shell_usage);
|
|
}
|
|
/* initialize the cwd */
|
|
getcwd(cwd, sizeof(cwd));
|
|
|
|
#ifdef BB_FEATURE_SH_COMMAND_EDITING
|
|
cmdedit_init();
|
|
signal(SIGWINCH, win_changed);
|
|
win_changed(0);
|
|
#endif
|
|
|
|
//if (argv[0] && argv[0][0] == '-') {
|
|
// shell_source("/etc/profile");
|
|
//}
|
|
|
|
if (argc < 2) {
|
|
fprintf(stdout, "\n\nBusyBox v%s (%s) Built-in shell\n", BB_VER, BB_BT);
|
|
fprintf(stdout, "Enter 'help' for a list of built-in commands.\n\n");
|
|
} else {
|
|
if (*argv[1]=='-') {
|
|
usage("sh\n\nlash -- the BusyBox LAme SHell (command interpreter)\n");
|
|
}
|
|
input = fopen(argv[1], "r");
|
|
if (!input) {
|
|
fatalError("sh: Couldn't open file '%s': %s\n", argv[1],
|
|
strerror(errno));
|
|
}
|
|
}
|
|
|
|
return (busy_loop(input));
|
|
}
|