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system.c revision 1.11.2.1 
      1 /*	$NetBSD: system.c,v 1.11.2.1 1996/09/18 02:43:02 jtc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char *sccsid = "from: @(#)system.c	5.10 (Berkeley) 2/23/91";
     39 #else
     40 static char *rcsid = "$NetBSD: system.c,v 1.11.2.1 1996/09/18 02:43:02 jtc Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include "namespace.h"
     45 #include <sys/types.h>
     46 #include <sys/wait.h>
     47 #include <signal.h>
     48 #include <stdlib.h>
     49 #include <unistd.h>
     50 #include <paths.h>
     51 
     52 extern char **environ;
     53 
     54 int
     55 system(command)
     56 	const char *command;
     57 {
     58 	pid_t pid;
     59 	sig_t intsave, quitsave;
     60 	int omask;
     61 	int pstat;
     62 	char *argp[] = {"sh", "-c", (char *) command, NULL};
     63 
     64 	if (!command)		/* just checking... */
     65 		return(1);
     66 
     67 	omask = sigblock(sigmask(SIGCHLD));
     68 	switch(pid = vfork()) {
     69 	case -1:			/* error */
     70 		(void)sigsetmask(omask);
     71 		return(-1);
     72 	case 0:				/* child */
     73 		(void)sigsetmask(omask);
     74 		execve(_PATH_BSHELL, argp, environ);
     75 		_exit(127);
     76 	}
     77 
     78 	intsave = signal(SIGINT, SIG_IGN);
     79 	quitsave = signal(SIGQUIT, SIG_IGN);
     80 	pid = waitpid(pid, (int *)&pstat, 0);
     81 	(void)sigsetmask(omask);
     82 	(void)signal(SIGINT, intsave);
     83 	(void)signal(SIGQUIT, quitsave);
     84 	return(pid == -1 ? -1 : pstat);
     85 }
     86