[apple/libc.git] / stdlib / FreeBSD / system.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.
 * 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 1.11 2007/01/09 00:28:10 imp 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 <spawn.h>
#include <paths.h>
#include <errno.h>
#include "un-namespace.h"
#include "libc_private.h"

#include <crt_externs.h>
#define environ (*_NSGetEnviron())

#if __DARWIN_UNIX03
#include <pthread.h>

static pthread_mutex_t __systemfn_mutex = PTHREAD_MUTEX_INITIALIZER;
extern int __unix_conforming;
#endif /* __DARWIN_UNIX03 */

int
__system(command)
	const char *command;
{
	pid_t pid, savedpid;
	int pstat, err;
	struct sigaction ign, intact, quitact;
	sigset_t newsigblock, oldsigblock, defaultsig;
	posix_spawnattr_t attr;
	short flags = POSIX_SPAWN_SETSIGMASK;
	const char *argv[] = {"sh", "-c", command, NULL};

#if __DARWIN_UNIX03
	if (__unix_conforming == 0)
		__unix_conforming = 1;
#ifdef VARIANT_CANCELABLE
	pthread_testcancel();
#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 ((err = posix_spawnattr_init(&attr)) != 0) {
		errno = err;
		return -1;
	}
	(void)sigemptyset(&defaultsig);

#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);
	if (intact.sa_handler != SIG_IGN) {
		sigaddset(&defaultsig, SIGINT);
		flags |= POSIX_SPAWN_SETSIGDEF;
	}
	(void)_sigaction(SIGQUIT, &ign, &quitact);
	if (quitact.sa_handler != SIG_IGN) {
		sigaddset(&defaultsig, SIGQUIT);
		flags |= POSIX_SPAWN_SETSIGDEF;
	}
	(void)sigemptyset(&newsigblock);
	(void)sigaddset(&newsigblock, SIGCHLD);
	(void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
	(void)posix_spawnattr_setsigmask(&attr, &oldsigblock);
	if (flags & POSIX_SPAWN_SETSIGDEF) {
		(void)posix_spawnattr_setsigdefault(&attr, &defaultsig);
	}
	(void)posix_spawnattr_setflags(&attr, flags);

	err = posix_spawn(&pid, _PATH_BSHELL, NULL, &attr, (char *const *)argv, environ);
	(void)posix_spawnattr_destroy(&attr);
	if (err == 0) {
		savedpid = pid;
		do {
			pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
		} while (pid == -1 && errno == EINTR);
		if (pid == -1) pstat = -1;
	} else if (err == ENOMEM || err == EAGAIN) { /* as if fork failed */
		pstat = -1;
	} else {
		pstat = W_EXITCODE(127, 0); /* couldn't exec shell */
	}

	(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(pstat);
}

__weak_reference(__system, system);
__weak_reference(__system, _system);
Commit	Line	Data
e9ce8d39 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.
e9ce8d39 A	13	* 4. 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
9385eb3d A	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	static char sccsid[] = "@(#)system.c 8.1 (Berkeley) 6/4/93";
	32	#endif /* LIBC_SCCS and not lint */
	33	#include <sys/cdefs.h>
1f2f436a	34	__FBSDID("$FreeBSD: src/lib/libc/stdlib/system.c,v 1.11 2007/01/09 00:28:10 imp Exp $");
e9ce8d39	35
9385eb3d	36	#include "namespace.h"
e9ce8d39 A	37	#include <sys/types.h>
	38	#include <sys/wait.h>
	39	#include <signal.h>
	40	#include <stdlib.h>
	41	#include <stddef.h>
	42	#include <unistd.h>
ad3c9f2a	43	#include <spawn.h>
e9ce8d39	44	#include <paths.h>
5b2abdfb	45	#include <errno.h>
9385eb3d A	46	#include "un-namespace.h"
9385eb3d A	47	#include "libc_private.h"
e9ce8d39	48
ad3c9f2a A	49	#include <crt_externs.h>
	50	#define environ (*_NSGetEnviron())
	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;
ad3c9f2a A	57	#endif /* __DARWIN_UNIX03 */
ad3c9f2a A	58
9385eb3d A	59	int
9385eb3d A	60	__system(command)
e9ce8d39 A	61	const char *command;
e9ce8d39 A	62	{
9385eb3d	63	pid_t pid, savedpid;
ad3c9f2a	64	int pstat, err;
9385eb3d	65	struct sigaction ign, intact, quitact;
ad3c9f2a A	66	sigset_t newsigblock, oldsigblock, defaultsig;
	67	posix_spawnattr_t attr;
	68	short flags = POSIX_SPAWN_SETSIGMASK;
	69	const char *argv[] = {"sh", "-c", command, NULL};
	70
	71	#if __DARWIN_UNIX03
	72	if (__unix_conforming == 0)
	73	__unix_conforming = 1;
	74	#ifdef VARIANT_CANCELABLE
6465356a	75	pthread_testcancel();
ad3c9f2a A	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	}
e9ce8d39	85
ad3c9f2a A	86	if ((err = posix_spawnattr_init(&attr)) != 0) {
	87	errno = err;
	88	return -1;
	89	}
	90	(void)sigemptyset(&defaultsig);
e9ce8d39	91
ad3c9f2a A	92	#if __DARWIN_UNIX03
	93	pthread_mutex_lock(&__systemfn_mutex);
	94	#endif /* __DARWIN_UNIX03 */
9385eb3d A	95	/*
	96	* Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
	97	* existing signal dispositions.
	98	*/
	99	ign.sa_handler = SIG_IGN;
	100	(void)sigemptyset(&ign.sa_mask);
	101	ign.sa_flags = 0;
	102	(void)_sigaction(SIGINT, &ign, &intact);
ad3c9f2a A	103	if (intact.sa_handler != SIG_IGN) {
	104	sigaddset(&defaultsig, SIGINT);
	105	flags \|= POSIX_SPAWN_SETSIGDEF;
	106	}
9385eb3d	107	(void)_sigaction(SIGQUIT, &ign, &quitact);
ad3c9f2a A	108	if (quitact.sa_handler != SIG_IGN) {
	109	sigaddset(&defaultsig, SIGQUIT);
	110	flags \|= POSIX_SPAWN_SETSIGDEF;
	111	}
9385eb3d A	112	(void)sigemptyset(&newsigblock);
	113	(void)sigaddset(&newsigblock, SIGCHLD);
	114	(void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
ad3c9f2a A	115	(void)posix_spawnattr_setsigmask(&attr, &oldsigblock);
	116	if (flags & POSIX_SPAWN_SETSIGDEF) {
	117	(void)posix_spawnattr_setsigdefault(&attr, &defaultsig);
	118	}
	119	(void)posix_spawnattr_setflags(&attr, flags);
	120
	121	err = posix_spawn(&pid, _PATH_BSHELL, NULL, &attr, (char const )argv, environ);
	122	(void)posix_spawnattr_destroy(&attr);
	123	if (err == 0) {
9385eb3d A	124	savedpid = pid;
	125	do {
	126	pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
	127	} while (pid == -1 && errno == EINTR);
ad3c9f2a A	128	if (pid == -1) pstat = -1;
	129	} else if (err == ENOMEM \|\| err == EAGAIN) { /* as if fork failed */
	130	pstat = -1;
	131	} else {
	132	pstat = W_EXITCODE(127, 0); /* couldn't exec shell */
e9ce8d39	133	}
ad3c9f2a	134
9385eb3d A	135	(void)_sigaction(SIGINT, &intact, NULL);
	136	(void)_sigaction(SIGQUIT, &quitact, NULL);
	137	(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
ad3c9f2a A	138	#if __DARWIN_UNIX03
	139	pthread_mutex_unlock(&__systemfn_mutex);
	140	#endif /* __DARWIN_UNIX03 */
	141	return(pstat);
e9ce8d39	142	}
9385eb3d A	143
	144	__weak_reference(__system, system);
	145	__weak_reference(__system, _system);