shadow/lib/spawn.c

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/*
* Copyright (c) 2011, Jonathan Nieder
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD
* PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include "exitcodes.h"
#include "spawn.h"
extern char **environ;
int run_command (const char *cmd, const char *argv[], const char *envp[],
int *status)
{
pid_t pid, wpid;
if (!envp)
envp = (const char **)environ;
pid = fork ();
if (pid == 0) {
execve (cmd, (char * const *) argv, (char * const *) envp);
if (errno == ENOENT)
exit (E_CMD_NOTFOUND);
perror(cmd);
exit (E_CMD_NOEXEC);
} else if ((pid_t)-1 == pid) {
int saved_errno = errno;
perror ("fork");
errno = saved_errno;
return -1;
}
do {
wpid = waitpid (pid, status, 0);
} while ((pid_t)-1 == wpid && errno == EINTR);
if ((pid_t)-1 == wpid) {
int saved_errno = errno;
perror ("waitpid");
return -1;
} else if (wpid != pid) {
(void) fprintf (stderr, "waitpid returned %ld != %ld\n",
(long int) wpid, (long int) pid);
errno = ECHILD;
return -1;
}
return 0;
}