shadow/libmisc/system.c

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/*
* Copyright (c) 2009 , Dan Walsh <dwalsh@redhat.com>
* All rights reserved.
*
* 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.
* 3. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* 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 COPYRIGHT
* HOLDERS 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>
#ident "$Id$"
#include <stdio.h>
#include <sys/wait.h>
#include <fcntl.h>
#include "prototypes.h"
#include "defines.h"
int safe_system (const char *command,
const char *argv[],
const char *env[],
int ignore_stderr)
{
int status = -1;
int fd;
pid_t pid;
pid = fork();
if (pid < 0) {
return -1;
}
if (pid) { /* Parent */
if (waitpid (pid, &status, 0) > 0) {
return status;
} else {
return -1;
}
}
fd = open ("/dev/null", O_RDWR);
/* Child */
dup2 (fd, 0); /* Close Stdin */
if (ignore_stderr) {
dup2 (fd, 2); /* Close Stderr */
}
execve (command, (char *const *) argv, (char *const *) env);
fprintf (stderr, _("Failed to exec '%s'\n"), argv[0]);
exit (EXIT_FAILURE);
}