scoutos / prex-0.9.0 / usr / bin / sh / sh.c @ 03e9c04a
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/*
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* Copyright (c) 2005-2009, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/prex.h> |
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#include <sys/keycode.h> |
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#include <sys/syslog.h> |
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#include <sys/wait.h> |
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#include <sys/fcntl.h> |
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#include <limits.h> |
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#include <dirent.h> |
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#include <termios.h> |
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#include <ctype.h> |
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#include <unistd.h> |
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#include <string.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <errno.h> |
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#include <setjmp.h> |
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#include <libgen.h> /* for basename() */ |
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#include "sh.h" |
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#define ARGMAX 32 |
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#define CMD_PIPE 1 |
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#define CMD_BACKGND 2 |
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#define CMD_BUILTIN 4 |
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|
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extern const struct cmdentry shell_cmds[]; |
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#ifdef CMDBOX
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extern const struct cmdentry builtin_cmds[]; |
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#define main(argc, argv) sh_main(argc, argv)
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#endif
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static pid_t shpid = 0; /* pid of shell */ |
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char retval; /* return value for shell */ |
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unsigned interact; /* if shell reads from stdin */ |
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jmp_buf jmpbuf; |
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static void |
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error(const char *msg, ...) |
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{
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va_list ap; |
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va_start(ap, msg); |
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if (msg != NULL) { |
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vfprintf(stderr, msg, ap); |
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fprintf(stderr, "\n");
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} |
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va_end(ap); |
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if (getpid() != shpid)
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_exit(1);
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if (!interact)
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_exit(1);
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retval = 1;
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} |
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static void |
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showsignal(int pid, int s) |
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{
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int signo = WTERMSIG(s);
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signo &= 0x7f;
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if (signo < NSIG && sys_siglist[signo])
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error(" %d: %s", pid, sys_siglist[signo]);
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else
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error(" %d: Signal %d", pid, signo);
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retval = signo + 0200;
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} |
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static void |
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showprompt(void)
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{
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static char cwd[PATH_MAX]; |
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static char prompt[PATH_MAX+20]; |
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getcwd(cwd, PATH_MAX); |
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sprintf(prompt, "\033[32m[prex:%s]\033[0m# ", cwd);
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write(1, prompt, strlen(prompt));
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} |
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static void |
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execute(int argc, char *argv[], int *redir, int flags, cmdfn_t cmdfn) |
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{
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int pid, i;
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int status;
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static char **arg; |
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char *file;
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char spid[20]; |
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arg = argc > 1 ? &argv[1] : NULL; |
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file = argv[0];
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pid = vfork(); |
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if (pid == -1) { |
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for (i = 0; i < 2; i++) |
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if (redir[i] != -1) |
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close(redir[i]); |
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error("Cannot fork");
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return;
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} |
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if (pid == 0) { |
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/* Child only */
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setpgid(0, 0); |
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tcsetpgrp(2, getpgrp());
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for (i = 0; i < 2; i++) { |
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if (redir[i] != -1) { |
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if (dup2(redir[i], i) == -1) |
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error("Cannot redirect %d", i);
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close(redir[i]); |
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} |
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} |
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signal(SIGINT, SIG_DFL); |
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signal(SIGQUIT, SIG_DFL); |
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signal(SIGTERM, SIG_DFL); |
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if (flags & CMD_BACKGND) {
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signal(SIGINT, SIG_IGN); |
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signal(SIGQUIT, SIG_IGN); |
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if (redir[0] == -1) { |
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close(0);
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open("/dev/null", O_RDWR);
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} |
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} |
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errno = 0;
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if (cmdfn) {
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task_setname(task_self(), basename(file)); |
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if (cmdfn(argc, argv) != 0) |
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fprintf(stderr, "%s: %s\n", argv[0], |
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strerror(errno)); |
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} else {
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execv(file, arg); |
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/* Try $PATH */
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if (errno == ENOENT)
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execvp(file, arg); |
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if (errno == ENOENT || errno == ENOTDIR)
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error("%s: command not found", argv[0]); |
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else if (errno == EACCES) |
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error("Permission denied");
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else
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error("%s cannot execute", argv[0]); |
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} |
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exit(1);
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/* NOTREACHED */
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} |
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/* Parent */
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for (i = 0; i < 2; i++) { |
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if (redir[i] != -1) |
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close(redir[i]); |
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} |
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if (flags & CMD_PIPE)
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return;
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if (flags & CMD_BACKGND) {
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sprintf(spid, "%u\n", pid);
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write(1, spid, strlen(spid));
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return;
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} |
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while (wait(&status) != pid);
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if (status) {
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if (WIFSIGNALED(status))
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showsignal(pid, status); |
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else if (WIFEXITED(status)) |
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retval = WEXITSTATUS(status); |
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} else
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retval = 0;
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return;
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} |
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static int |
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redirect(char **args, int *redir) |
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{
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unsigned int i, io, append = 0; |
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int fd, argc;
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char *p, *file;
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for (i = 0; args[i] != NULL; i++) { |
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p = args[i]; |
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switch (*p) {
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case '<': |
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io = 0;
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break;
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case '>': |
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io = 1;
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if (*(p + 1) == '>') { |
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append = 1;
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p++; |
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} |
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break;
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default:
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continue;
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} |
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/* get file name */
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args[i] = (char *)-1; |
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if (*(p + 1) == '\0') { |
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file = args[++i]; |
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args[i] = (char *)-1; |
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} else
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file = p + 1;
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/* if redirected from pipe, ignore */
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if (redir[io] == -1) { |
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if (io == 1) { |
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if (append)
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fd = open(file, O_WRONLY | O_APPEND); |
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else
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fd = creat(file, 0666);
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} else
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fd = open(file, O_RDONLY); |
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if (fd == -1) { |
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error("%s: cannot open", file);
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return -1; |
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} |
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redir[io] = fd; |
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} |
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} |
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/* strip redirection info */
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argc = 0;
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for (i = 0; args[i]; i++) { |
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if (args[i] != (char *)-1) |
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args[argc++] = args[i]; |
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} |
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args[argc] = NULL;
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return argc;
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} |
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static cmdfn_t
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findcmd(const struct cmdentry cmds[], char *cmd) |
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{
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int i = 0; |
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while (cmds[i].cmd != NULL) { |
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if (!strcmp(cmd, cmds[i].cmd))
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return cmds[i].func;
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i++; |
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} |
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return 0; |
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} |
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static void |
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parsecmd(char *cmds, int *redir, int flags) |
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{
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static char cmdbox[] = "cmdbox"; |
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static char *args[ARGMAX]; |
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char *p, *word = NULL; |
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cmdfn_t fn; |
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int i, argc = 0; |
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optind = 1; /* for nommu */ |
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if (cmds[0] != ' ' && cmds[0] != '\t') |
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word = cmds; |
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p = cmds; |
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while (*p) {
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if (word == NULL) { |
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/* Skip white space. */
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if (*p != ' ' && *p != '\t') |
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word = p; |
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} else {
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if (*p == ' ' || *p == '\t') { |
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*p = '\0';
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args[argc++] = word; |
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word = NULL;
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if (argc >= ARGMAX - 1) { |
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error("Too many args");
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return;
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} |
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} |
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} |
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p++; |
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} |
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if (argc == 0 && word == NULL) |
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return;
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if (word)
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args[argc++] = word; |
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args[argc] = NULL;
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/* Handle variable */
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if ((p = strchr(args[0], '=')) != NULL) { |
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*p++ = '\0';
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if (*p == '\0') |
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unsetvar(args[0]);
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else
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setvar(args[0], p);
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return;
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} |
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fn = findcmd(shell_cmds, args[0]);
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if (fn) {
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/* Run as shell internal command */
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if ((*fn)(argc, args) != 0) |
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error("%s: %s", args[0], strerror(errno)); |
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return;
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} |
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argc = redirect(args, redir); |
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if (argc == -1) |
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return;
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fn = findcmd(builtin_cmds, args[0]);
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/*
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* Alias: 'sh' => 'cmdbox sh'
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*/
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if (fn == NULL && !strcmp(args[0], "sh")) { |
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for (i = argc; i >= 0; i--) |
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args[i + 1] = args[i];
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args[0] = cmdbox;
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argc++; |
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} |
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execute(argc, args, redir, flags, fn); |
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} |
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|
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static void |
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parsepipe(char *str, int flags) |
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{
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int pip[2] = { -1, -1 }; |
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int redir[2] = { -1, -1 }; |
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char *p, *cmds;
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p = cmds = str; |
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while (*cmds) {
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switch (*p) {
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case '|': |
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*p = '\0';
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redir[0] = pip[0]; |
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if (pipe(pip) == -1) { |
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error("Cannot pipe");
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return;
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} |
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redir[1] = pip[1]; |
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parsecmd(cmds, redir, flags | CMD_PIPE); |
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cmds = p + 1;
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break;
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case '\0': |
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redir[0] = pip[0]; |
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redir[1] = -1; |
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parsecmd(cmds, redir, flags); |
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return;
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} |
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p++; |
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} |
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} |
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|
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static void |
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parseline(char *line)
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{
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char *p, *cmds;
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p = cmds = line; |
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while (*cmds) {
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switch (*p) {
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case ';': |
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*p = '\0';
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parsepipe(cmds, 0);
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cmds = p + 1;
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break;
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case '&': |
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*p = '\0';
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parsepipe(cmds, CMD_BACKGND); |
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cmds = p + 1;
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break;
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case '\0': |
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case '\n': |
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case '#': |
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*p = '\0';
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parsepipe(cmds, 0);
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return;
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} |
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p++; |
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} |
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} |
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|
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static char * |
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readline(int fd, char *line, int len) |
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{
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char *p = line;
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int nleft = len;
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int cnt;
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|
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while (--nleft > 0) { |
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cnt = read(fd, p, 1);
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if (cnt == -1) |
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return (char *)-1; /* error */ |
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if (cnt == 0) { |
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if (p == line)
|
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return NULL; /* EOF */ |
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break;
|
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} |
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if (*p == '\n') |
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break;
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p++; |
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} |
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*p = '\0';
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return line;
|
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} |
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|
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static void |
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cmdloop(int fd)
|
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{
|
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static char line[LINE_MAX]; |
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char *p;
|
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|
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for (;;) {
|
| 439 |
if (interact)
|
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showprompt(); |
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|
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line[0] = '\0'; |
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p = readline(fd, line, sizeof(line));
|
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if (p == (char *)-1) |
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continue;
|
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if (p == NULL) |
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break;
|
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parseline(line); |
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tcsetpgrp(2, shpid);
|
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} |
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} |
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|
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int
|
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main(int argc, char **argv) |
| 455 |
{
|
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int input;
|
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|
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if (shpid == 0) |
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shpid = getpid(); |
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|
| 461 |
if (setjmp(jmpbuf)) {
|
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argv = (char **)0; |
| 463 |
argc = 1;
|
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} |
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interact = 1;
|
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initvar(); |
| 467 |
|
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if (argc == 1) { |
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input = 0;
|
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if (isatty(0) && isatty(1)) { |
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interact = 1;
|
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signal(SIGINT, SIG_IGN); |
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signal(SIGQUIT, SIG_IGN); |
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signal(SIGTERM, SIG_IGN); |
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} |
| 476 |
} else {
|
| 477 |
interact = 0;
|
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close(0);
|
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input = open(argv[1], O_RDONLY);
|
| 480 |
if (input < 0) { |
| 481 |
fprintf(stderr, "%s: cannot open\n", argv[1]); |
| 482 |
interact = 1;
|
| 483 |
exit(1);
|
| 484 |
} |
| 485 |
} |
| 486 |
cmdloop(input); |
| 487 |
exit(retval); |
| 488 |
return 0; |
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} |