f60f35f3ab
that these calls be thread-safe with respect to the environment, and it causes serious problems for threaded applications which call vfork() and exec*() (including indirectly, via popen() or system()). Acquire and release __environ_lock in the parent in popen() and system() to play safe and provide the child with a stable environment. __environ_lock should also have an atfork() handler; still under development.
117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/* $NetBSD: system.c,v 1.18 2003/03/04 19:44:10 nathanw 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 1.18 2003/03/04 19:44:10 nathanw 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 <errno.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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#include "reentrant.h"
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#ifdef _REENTRANT
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extern rwlock_t __environ_lock;
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#endif
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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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struct sigaction intsa, quitsa, sa;
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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 == NULL) /* just checking... */
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return(1);
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sa.sa_handler = SIG_IGN;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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if (sigaction(SIGINT, &sa, &intsa) == -1)
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return -1;
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if (sigaction(SIGQUIT, &sa, &quitsa) == -1)
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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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rwlock_rdlock(&__environ_lock);
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switch(pid = vfork()) {
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case -1: /* error */
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rwlock_unlock(&__environ_lock);
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sigaction(SIGINT, &intsa, NULL);
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sigaction(SIGQUIT, &quitsa, NULL);
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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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sigaction(SIGINT, &intsa, NULL);
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sigaction(SIGQUIT, &quitsa, NULL);
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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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rwlock_unlock(&__environ_lock);
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while (waitpid(pid, &pstat, 0) == -1) {
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if (errno != EINTR) {
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pstat = -1;
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break;
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}
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}
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sigaction(SIGINT, &intsa, NULL);
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sigaction(SIGQUIT, &quitsa, NULL);
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(void)sigprocmask(SIG_SETMASK, &omask, NULL);
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return (pstat);
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}
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