1/*	$OpenBSD: system.c,v 1.8 2005/08/08 08:05:37 espie Exp $ */
2/*
3 * Copyright (c) 1988 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/types.h>
32#include <sys/wait.h>
33#include <signal.h>
34#include <stdlib.h>
35#include <unistd.h>
36#include <paths.h>
37
38extern char **environ;
39
40int
41system(const char *command)
42{
43	pid_t pid;
44	sig_t intsave, quitsave;
45	sigset_t mask, omask;
46	int pstat;
47	char *argp[] = {"sh", "-c", NULL, NULL};
48
49	if (!command)		/* just checking... */
50		return(1);
51
52	argp[2] = (char *)command;
53
54	sigemptyset(&mask);
55	sigaddset(&mask, SIGCHLD);
56	sigprocmask(SIG_BLOCK, &mask, &omask);
57	switch (pid = vfork()) {
58	case -1:			/* error */
59		sigprocmask(SIG_SETMASK, &omask, NULL);
60		return(-1);
61	case 0:				/* child */
62		sigprocmask(SIG_SETMASK, &omask, NULL);
63		execve(_PATH_BSHELL, argp, environ);
64		_exit(127);
65	}
66
67	intsave = signal(SIGINT, SIG_IGN);
68	quitsave = signal(SIGQUIT, SIG_IGN);
69	pid = waitpid(pid, (int *)&pstat, 0);
70	sigprocmask(SIG_SETMASK, &omask, NULL);
71	(void)signal(SIGINT, intsave);
72	(void)signal(SIGQUIT, quitsave);
73	return (pid == -1 ? -1 : pstat);
74}
75