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Annotation of prex-old/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