1 /*
2 * Copyright (c) 1988 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)system.c 5.10 (Berkeley) 2/23/91";
36 #endif /* LIBC_SCCS and not lint */
37
38 #include <sys/types.h>
39 #include <sys/signal.h>
40 #include <sys/wait.h>
41 #include <stdlib.h>
42 #include <stddef.h>
43 #include <unistd.h>
44 #include <paths.h>
45
system(command)46 system(command)
47 const char *command;
48 {
49 union wait pstat;
50 pid_t pid;
51 int omask;
52 sig_t intsave, quitsave;
53
54 if (!command) /* just checking... */
55 return(1);
56
57 omask = sigblock(sigmask(SIGCHLD));
58 switch(pid = vfork()) {
59 case -1: /* error */
60 (void)sigsetmask(omask);
61 pstat.w_status = 0;
62 pstat.w_retcode = 127;
63 return(pstat.w_status);
64 case 0: /* child */
65 (void)sigsetmask(omask);
66 execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
67 _exit(127);
68 }
69 intsave = signal(SIGINT, SIG_IGN);
70 quitsave = signal(SIGQUIT, SIG_IGN);
71 pid = waitpid(pid, (int *)&pstat, 0);
72 (void)sigsetmask(omask);
73 (void)signal(SIGINT, intsave);
74 (void)signal(SIGQUIT, quitsave);
75 return(pid == -1 ? -1 : pstat.w_status);
76 }
77