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f5016eda WJ |
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 | ||
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 | } |