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Annotation of prex-old/usr/bin/sh/exec.c, Revision 1.1.1.1

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