[apple/libc.git] / stdlib / system-fbsd.c

/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)system.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdlib/system.c,v 1.10 2002/03/22 21:53:10 obrien Exp $");

#include "namespace.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <paths.h>
#include <errno.h>
#include "un-namespace.h"
#include "libc_private.h"

#if __DARWIN_UNIX03
#include <pthread.h>

static pthread_mutex_t __systemfn_mutex = PTHREAD_MUTEX_INITIALIZER;
extern int __unix_conforming;
#ifdef VARIANT_CANCELABLE
extern void _pthread_testcancel(pthread_t thread, int isconforming);
#endif /* VARIANT_CANCELABLE */
#endif /* __DARWIN_UNIX03 */

int
__system(command)
	const char *command;
{
	pid_t pid, savedpid;
	int pstat;
	struct sigaction ign, intact, quitact;
	sigset_t newsigblock, oldsigblock;

#if __DARWIN_UNIX03
	if (__unix_conforming == 0)
		__unix_conforming = 1;
#ifdef VARIANT_CANCELABLE
	_pthread_testcancel(pthread_self(), 1);
#endif /* VARIANT_CANCELABLE */
#endif /* __DARWIN_UNIX03 */

	if (!command) {		/* just checking... */
		if (access(_PATH_BSHELL, F_OK) == -1)	/* if no sh or no access */
			return(0);
		else
			return(1);
	}

#if __DARWIN_UNIX03
	pthread_mutex_lock(&__systemfn_mutex);
#endif /* __DARWIN_UNIX03 */
	/*
	 * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
	 * existing signal dispositions.
	 */
	ign.sa_handler = SIG_IGN;
	(void)sigemptyset(&ign.sa_mask);
	ign.sa_flags = 0;
	(void)_sigaction(SIGINT, &ign, &intact);
	(void)_sigaction(SIGQUIT, &ign, &quitact);
	(void)sigemptyset(&newsigblock);
	(void)sigaddset(&newsigblock, SIGCHLD);
	(void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
	switch(pid = fork()) {
	case -1:			/* error */
		break;
	case 0:				/* child */
		/*
		 * Restore original signal dispositions and exec the command.
		 */
		(void)_sigaction(SIGINT, &intact, NULL);
		(void)_sigaction(SIGQUIT,  &quitact, NULL);
		(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
#if __DARWIN_UNIX03
		pthread_mutex_unlock(&__systemfn_mutex);
#endif /* __DARWIN_UNIX03 */
		execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
		_exit(127);
	default:			/* parent */
		savedpid = pid;
		do {
			pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
		} while (pid == -1 && errno == EINTR);
		break;
	}
	(void)_sigaction(SIGINT, &intact, NULL);
	(void)_sigaction(SIGQUIT,  &quitact, NULL);
	(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
#if __DARWIN_UNIX03
	pthread_mutex_unlock(&__systemfn_mutex);
#endif /* __DARWIN_UNIX03 */
	return(pid == -1 ? -1 : pstat);
}

__weak_reference(__system, system);
__weak_reference(__system, _system);
Commit	Line	Data
224c7076 A	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. 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 8.1 (Berkeley) 6/4/93";
	36	#endif /* LIBC_SCCS and not lint */
	37	#include <sys/cdefs.h>
	38	__FBSDID("$FreeBSD: src/lib/libc/stdlib/system.c,v 1.10 2002/03/22 21:53:10 obrien Exp $");
	39
	40	#include "namespace.h"
	41	#include <sys/types.h>
	42	#include <sys/wait.h>
	43	#include <signal.h>
	44	#include <stdlib.h>
	45	#include <stddef.h>
	46	#include <unistd.h>
	47	#include <paths.h>
	48	#include <errno.h>
	49	#include "un-namespace.h"
	50	#include "libc_private.h"
	51
	52	#if __DARWIN_UNIX03
	53	#include <pthread.h>
	54
	55	static pthread_mutex_t __systemfn_mutex = PTHREAD_MUTEX_INITIALIZER;
	56	extern int __unix_conforming;
	57	#ifdef VARIANT_CANCELABLE
	58	extern void _pthread_testcancel(pthread_t thread, int isconforming);
	59	#endif /* VARIANT_CANCELABLE */
	60	#endif /* __DARWIN_UNIX03 */
	61
	62	int
	63	__system(command)
	64	const char *command;
65	{
66	pid_t pid, savedpid;
67	int pstat;
68	struct sigaction ign, intact, quitact;
69	sigset_t newsigblock, oldsigblock;
70
71	#if __DARWIN_UNIX03
72	if (__unix_conforming == 0)
73	__unix_conforming = 1;
74	#ifdef VARIANT_CANCELABLE
75	_pthread_testcancel(pthread_self(), 1);
76	#endif /* VARIANT_CANCELABLE */
77	#endif /* __DARWIN_UNIX03 */
78
79	if (!command) { /* just checking... */
80	if (access(_PATH_BSHELL, F_OK) == -1) /* if no sh or no access */
81	return(0);
82	else
83	return(1);
84	}
85
86	#if __DARWIN_UNIX03
87	pthread_mutex_lock(&__systemfn_mutex);
88	#endif /* __DARWIN_UNIX03 */
89	/*
90	* Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
91	* existing signal dispositions.
92	*/
93	ign.sa_handler = SIG_IGN;
94	(void)sigemptyset(&ign.sa_mask);
95	ign.sa_flags = 0;
96	(void)_sigaction(SIGINT, &ign, &intact);
97	(void)_sigaction(SIGQUIT, &ign, &quitact);
98	(void)sigemptyset(&newsigblock);
99	(void)sigaddset(&newsigblock, SIGCHLD);
100	(void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
101	switch(pid = fork()) {
102	case -1: /* error */
103	break;
104	case 0: /* child */
105	/*
106	* Restore original signal dispositions and exec the command.
107	*/
108	(void)_sigaction(SIGINT, &intact, NULL);
109	(void)_sigaction(SIGQUIT, &quitact, NULL);
110	(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
111	#if __DARWIN_UNIX03
112	pthread_mutex_unlock(&__systemfn_mutex);
113	#endif /* __DARWIN_UNIX03 */
114	execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
115	_exit(127);
116	default: /* parent */
117	savedpid = pid;
118	do {
119	pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
120	} while (pid == -1 && errno == EINTR);
121	break;
122	}
123	(void)_sigaction(SIGINT, &intact, NULL);
124	(void)_sigaction(SIGQUIT, &quitact, NULL);
125	(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
126	#if __DARWIN_UNIX03
127	pthread_mutex_unlock(&__systemfn_mutex);
128	#endif /* __DARWIN_UNIX03 */
129	return(pid == -1 ? -1 : pstat);
130	}
131
132	__weak_reference(__system, system);
133	__weak_reference(__system, _system);