Annotation of prex/usr/bin/sh/exec.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005-2006, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <prex/prex.h>
! 31: #include <sys/wait.h>
! 32:
! 33: #include <stdlib.h>
! 34: #include <string.h>
! 35: #include <dirent.h>
! 36: #include <limits.h>
! 37: #include <errno.h>
! 38: #include <unistd.h>
! 39: #include <stdio.h>
! 40:
! 41: #include "sh.h"
! 42:
! 43: /*
! 44: * Fork and execute command.
! 45: */
! 46: int
! 47: exec_cmd(int argc, char *argv[])
! 48: {
! 49: int pid, cpid;
! 50: int status;
! 51: static char **arg;
! 52: char *file;
! 53: char path[PATH_MAX];
! 54: char *env[] = { "PATH=path", "Foo", 0 };
! 55:
! 56: arg = argc > 1 ? &argv[1] : NULL;
! 57: file = argv[0];
! 58: if (file[0] == '/')
! 59: strlcpy(path, file, sizeof(path));
! 60: else {
! 61: getcwd(path, PATH_MAX);
! 62: if (!(path[0] == '/' && path[1] == '\0'))
! 63: strlcat(path, "/", sizeof(path));
! 64: strlcat(path, file, sizeof(path));
! 65: }
! 66: path[PATH_MAX - 1] = '\0';
! 67:
! 68: pid = vfork();
! 69: if (pid == -1) {
! 70: fprintf(stderr, "cmdbox: Cannot fork\n");
! 71: return -1;
! 72: }
! 73: if (pid == 0) {
! 74: /* Child only */
! 75: execve(path, arg, env);
! 76: if (errno == ENOENT || errno == ENOTDIR)
! 77: fprintf(stderr, "cmdbox: %s: command not found\n",
! 78: argv[0]);
! 79: else
! 80: fprintf(stderr, "cmdbox: %s cannot execute\n",
! 81: argv[0]);
! 82: exit(1);
! 83: }
! 84: /* Parent */
! 85: while (1) {
! 86: cpid = wait(&status);
! 87: if (cpid == -1 && errno != EINTR)
! 88: break;
! 89: if (cpid == pid)
! 90: break;
! 91: }
! 92: return 0;
! 93: }
! 94:
! 95: #ifdef CMDBOX
! 96: static void
! 97: show_signal(int s)
! 98: {
! 99: int signo = WTERMSIG(s);
! 100:
! 101: signo &= 0x7f;
! 102: if (signo < NSIG && sys_siglist[signo])
! 103: fputs(sys_siglist[signo], stderr);
! 104: else
! 105: fprintf(stderr, "Signal %d", signo);
! 106:
! 107: fputs("\n", stderr);
! 108: }
! 109:
! 110: int
! 111: exec_builtin(cmd_func_t cmd, int argc, char *argv[])
! 112: {
! 113: int status;
! 114: pid_t cpid;
! 115:
! 116: cpid = vfork();
! 117: if (cpid == -1) {
! 118: fprintf(stderr, "cmdbox: Cannot fork\n");
! 119: return -1;
! 120: }
! 121: if (cpid == 0) {
! 122: /* Child only */
! 123: task_name(task_self(), argv[0]);
! 124: errno = 0;
! 125: if (cmd(argc, argv) != 0)
! 126: printf("%s: %s\n", argv[0], strerror(errno));
! 127: exit(1);
! 128: }
! 129: /* Parent */
! 130: while (wait(&status) != cpid) ;
! 131:
! 132: if (status) {
! 133: if (WIFSIGNALED(status))
! 134: show_signal(status);
! 135: else if (WIFEXITED(status))
! 136: return WEXITSTATUS(status);
! 137: }
! 138: return 0;
! 139: }
! 140: #endif
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