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 <signal.h>
33 #include <stdlib.h>
34 #include <unistd.h>
35 #include <paths.h>
36 #include <sys/wait.h>
37
38 extern char **environ;
39
40 int
system(const char * command)41 system(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 = (sig_t) bsd_signal(SIGINT, SIG_IGN);
68 quitsave = (sig_t) bsd_signal(SIGQUIT, SIG_IGN);
69 pid = waitpid(pid, (int *)&pstat, 0);
70 sigprocmask(SIG_SETMASK, &omask, NULL);
71 (void)bsd_signal(SIGINT, intsave);
72 (void)bsd_signal(SIGQUIT, quitsave);
73 return (pid == -1 ? -1 : pstat);
74 }
75