90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/* $NetBSD: system.c,v 1.16 1998/11/15 17:13:52 christos Exp $ */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)system.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: system.c,v 1.16 1998/11/15 17:13:52 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <paths.h>
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extern char **environ;
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int
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system(command)
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const char *command;
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{
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pid_t pid;
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sig_t intsave, quitsave;
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sigset_t nmask, omask;
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int pstat;
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char *argp[] = {"sh", "-c", /* LINTED */(char *)command, NULL};
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if (!command) /* just checking... */
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return(1);
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sigemptyset(&nmask);
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sigaddset(&nmask, SIGCHLD);
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if (sigprocmask(SIG_BLOCK, &nmask, &omask) == -1)
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return -1;
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switch(pid = vfork()) {
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case -1: /* error */
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(void)sigprocmask(SIG_SETMASK, &omask, NULL);
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return(-1);
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case 0: /* child */
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(void)sigprocmask(SIG_SETMASK, &omask, NULL);
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execve(_PATH_BSHELL, argp, environ);
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_exit(127);
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}
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intsave = signal(SIGINT, SIG_IGN);
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quitsave = signal(SIGQUIT, SIG_IGN);
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pid = waitpid(pid, (int *)&pstat, 0);
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(void)sigprocmask(SIG_SETMASK, &omask, NULL);
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(void)signal(SIGINT, intsave);
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(void)signal(SIGQUIT, quitsave);
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return(pid == -1 ? -1 : pstat);
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}
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