1 /* $OpenBSD: system.c,v 1.11 2015/10/23 04:44:41 guenther 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 <errno.h>
34 #include <signal.h>
35 #include <stdlib.h>
36 #include <unistd.h>
37 #include <paths.h>
38
39 extern char **environ;
40
41 int
system(const char * command)42 system(const char *command)
43 {
44 pid_t pid, cpid;
45 struct sigaction intsave, quitsave;
46 sigset_t mask, omask;
47 int pstat;
48 char *argp[] = {"sh", "-c", NULL, NULL};
49
50 if (!command) /* just checking... */
51 return(1);
52
53 argp[2] = (char *)command;
54
55 sigemptyset(&mask);
56 sigaddset(&mask, SIGCHLD);
57 sigprocmask(SIG_BLOCK, &mask, &omask);
58 switch (cpid = vfork()) {
59 case -1: /* error */
60 sigprocmask(SIG_SETMASK, &omask, NULL);
61 return(-1);
62 case 0: /* child */
63 sigprocmask(SIG_SETMASK, &omask, NULL);
64 execve(_PATH_BSHELL, argp, environ);
65 _exit(127);
66 }
67
68 sigaction(SIGINT, NULL, &intsave);
69 sigaction(SIGQUIT, NULL, &quitsave);
70 do {
71 pid = waitpid(cpid, &pstat, 0);
72 } while (pid == -1 && errno == EINTR);
73 sigprocmask(SIG_SETMASK, &omask, NULL);
74 sigaction(SIGINT, &intsave, NULL);
75 sigaction(SIGQUIT, &quitsave, NULL);
76 return (pid == -1 ? -1 : pstat);
77 }
78 DEF_STRONG(system);
79