Use pkgsrc packages from a custom location.
[dragonfly.git] / lib / libc / stdlib / system.c
blobd69c65022daef08c1a0b628a0aabd000c481d0bb
1 /*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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.
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.
33 * $FreeBSD: src/lib/libc/stdlib/system.c,v 1.5.2.2 2001/10/10 12:50:22 alfred Exp $
34 * $DragonFly: src/lib/libc/stdlib/system.c,v 1.5 2005/11/20 12:37:49 swildner Exp $
36 * @(#)system.c 8.1 (Berkeley) 6/4/93
39 #include "namespace.h"
40 #include <sys/types.h>
41 #include <sys/wait.h>
42 #include <signal.h>
43 #include <stdlib.h>
44 #include <stddef.h>
45 #include <unistd.h>
46 #include <paths.h>
47 #include <errno.h>
48 #include "un-namespace.h"
49 #include "libc_private.h"
51 int __system(const char *);
53 int
54 __system(const char *command)
56 pid_t pid, savedpid;
57 int pstat;
58 struct sigaction ign, intact, quitact;
59 sigset_t newsigblock, oldsigblock;
61 if (!command) /* just checking... */
62 return(1);
65 * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
66 * existing signal dispositions.
68 ign.sa_handler = SIG_IGN;
69 sigemptyset(&ign.sa_mask);
70 ign.sa_flags = 0;
71 _sigaction(SIGINT, &ign, &intact);
72 _sigaction(SIGQUIT, &ign, &quitact);
73 sigemptyset(&newsigblock);
74 sigaddset(&newsigblock, SIGCHLD);
75 _sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
76 switch(pid = fork()) {
77 case -1: /* error */
78 break;
79 case 0: /* child */
81 * Restore original signal dispositions and exec the command.
83 _sigaction(SIGINT, &intact, NULL);
84 _sigaction(SIGQUIT, &quitact, NULL);
85 _sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
86 execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
87 _exit(127);
88 default: /* parent */
89 savedpid = pid;
90 do {
91 pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
92 } while (pid == -1 && errno == EINTR);
93 break;
95 _sigaction(SIGINT, &intact, NULL);
96 _sigaction(SIGQUIT, &quitact, NULL);
97 _sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
98 return(pid == -1 ? -1 : pstat);
101 __weak_reference(__system, system);
102 __weak_reference(__system, _system);