[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.
 * 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"

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

	if (!command)		/* just checking... */
		return(1);

	/*
	 * 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);
		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);
	return(pid == -1 ? -1 : 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.
	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
9385eb3d A	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 $");
e9ce8d39	39
9385eb3d	40	#include "namespace.h"
e9ce8d39 A	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>
5b2abdfb	48	#include <errno.h>
9385eb3d A	49	#include "un-namespace.h"
9385eb3d A	50	#include "libc_private.h"
e9ce8d39	51
9385eb3d A	52	int
9385eb3d A	53	__system(command)
e9ce8d39 A	54	const char *command;
e9ce8d39 A	55	{
9385eb3d A	56	pid_t pid, savedpid;
	57	int pstat;
	58	struct sigaction ign, intact, quitact;
	59	sigset_t newsigblock, oldsigblock;
e9ce8d39 A	60
	61	if (!command) /* just checking... */
	62	return(1);
	63
9385eb3d A	64	/*
	65	* Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
	66	* existing signal dispositions.
	67	*/
	68	ign.sa_handler = SIG_IGN;
	69	(void)sigemptyset(&ign.sa_mask);
	70	ign.sa_flags = 0;
	71	(void)_sigaction(SIGINT, &ign, &intact);
	72	(void)_sigaction(SIGQUIT, &ign, &quitact);
	73	(void)sigemptyset(&newsigblock);
	74	(void)sigaddset(&newsigblock, SIGCHLD);
	75	(void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
	76	switch(pid = fork()) {
e9ce8d39	77	case -1: /* error */
9385eb3d	78	break;
e9ce8d39	79	case 0: /* child */
9385eb3d A	80	/*
	81	* Restore original signal dispositions and exec the command.
	82	*/
	83	(void)_sigaction(SIGINT, &intact, NULL);
	84	(void)_sigaction(SIGQUIT, &quitact, NULL);
	85	(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
e9ce8d39 A	86	execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
e9ce8d39 A	87	_exit(127);
9385eb3d A	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;
e9ce8d39	94	}
9385eb3d A	95	(void)_sigaction(SIGINT, &intact, NULL);
	96	(void)_sigaction(SIGQUIT, &quitact, NULL);
	97	(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
	98	return(pid == -1 ? -1 : pstat);
e9ce8d39	99	}
9385eb3d A	100
	101	__weak_reference(__system, system);
	102	__weak_reference(__system, _system);