1/*
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)system.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36#include "namespace.h"
37#include <sys/types.h>
38#include <sys/wait.h>
39#include <signal.h>
40#include <stdlib.h>
41#include <stddef.h>
42#include <string.h>
43#include <unistd.h>
44#include <paths.h>
45#include <errno.h>
46#include "un-namespace.h"
47#include "libc_private.h"
48
49#pragma weak system
50int
51system(const char *command)
52{
53
54	return (((int (*)(const char *))
55	    __libc_interposing[INTERPOS_system])(command));
56}
57
58int
59__libc_system(const char *command)
60{
61	pid_t pid, savedpid;
62	int pstat;
63	struct sigaction ign, intact, quitact;
64	sigset_t newsigblock, oldsigblock;
65
66	if (!command)		/* just checking... */
67		return(1);
68
69	(void)sigemptyset(&newsigblock);
70	(void)sigaddset(&newsigblock, SIGCHLD);
71	(void)sigaddset(&newsigblock, SIGINT);
72	(void)sigaddset(&newsigblock, SIGQUIT);
73	(void)__libc_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
74	switch(pid = vfork()) {
75	/*
76	 * In the child, use unwrapped syscalls.  libthr is in
77	 * undefined state after vfork().
78	 */
79	case -1:			/* error */
80		(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
81		return (-1);
82	case 0:				/* child */
83		/*
84		 * Restore original signal dispositions and exec the command.
85		 */
86		(void)__sys_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
87		execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
88		_exit(127);
89	}
90	/*
91	 * If we are running means that the child has either completed
92	 * its execve, or has failed.
93	 * Block SIGINT/QUIT because sh -c handles it and wait for
94	 * it to clean up.
95	 */
96	memset(&ign, 0, sizeof(ign));
97	ign.sa_handler = SIG_IGN;
98	(void)sigemptyset(&ign.sa_mask);
99	(void)__libc_sigaction(SIGINT, &ign, &intact);
100	(void)__libc_sigaction(SIGQUIT, &ign, &quitact);
101	savedpid = pid;
102	do {
103		pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
104	} while (pid == -1 && errno == EINTR);
105	(void)__libc_sigaction(SIGINT, &intact, NULL);
106	(void)__libc_sigaction(SIGQUIT,  &quitact, NULL);
107	(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
108	return (pid == -1 ? -1 : pstat);
109}
110
111__weak_reference(__libc_system, __system);
112__weak_reference(__libc_system, _system);
113