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3d394a1da0
There is no need to call execl(), which will allocate an array and copy our arguments into it, when we can use a static array and call execve() directly. MFC after: 1 week Sponsored by: Klara, Inc. Reviewed by: kevans Differential Revision: https://reviews.freebsd.org/D55648 (cherry picked from commit 40e52e0edd038460a2a2aca017b3ac5a513fe37b)
140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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. 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 "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 <paths.h>
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#include <signal.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#include "spinlock.h"
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#pragma weak system
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int
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system(const char *command)
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{
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return (((int (*)(const char *))
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__libc_interposing[INTERPOS_system])(command));
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}
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int
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__libc_system(const char *command)
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{
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static spinlock_t lock = _SPINLOCK_INITIALIZER;
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static volatile unsigned long concurrent;
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static struct sigaction ointact, oquitact;
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struct sigaction ign;
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sigset_t sigblock, osigblock;
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char *argv[] = { "sh", "-c", __DECONST(char *, command), NULL };
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extern char **environ;
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int pstat = -1, serrno = 0;
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pid_t pid;
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if (command == NULL) /* just checking... */
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return (eaccess(_PATH_BSHELL, X_OK) == 0);
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/*
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* If we are the first concurrent instance, ignore SIGINT and
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* SIGQUIT. Block SIGCHLD regardless of concurrency, since on
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* FreeBSD, sigprocmask() is equivalent to pthread_sigmask().
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*/
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if (__isthreaded)
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_SPINLOCK(&lock);
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if (concurrent++ == 0) {
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memset(&ign, 0, sizeof(ign));
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ign.sa_handler = SIG_IGN;
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sigemptyset(&ign.sa_mask);
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(void)__libc_sigaction(SIGINT, &ign, &ointact);
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(void)__libc_sigaction(SIGQUIT, &ign, &oquitact);
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}
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sigemptyset(&sigblock);
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sigaddset(&sigblock, SIGCHLD);
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(void)__libc_sigprocmask(SIG_BLOCK, &sigblock, &osigblock);
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if (__isthreaded)
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_SPINUNLOCK(&lock);
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/*
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* Fork the child process.
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*/
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if ((pid = fork()) < 0) { /* error */
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serrno = errno;
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} else if (pid == 0) { /* child */
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/*
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* Restore original signal dispositions.
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*/
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(void)__libc_sigaction(SIGINT, &ointact, NULL);
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(void)__libc_sigaction(SIGQUIT, &oquitact, NULL);
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(void)__sys_sigprocmask(SIG_SETMASK, &osigblock, NULL);
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/*
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* Exec the command.
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*/
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_execve(_PATH_BSHELL, argv, environ);
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_exit(127);
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} else { /* parent */
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/*
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* Wait for the child to terminate.
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*/
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while (_wait4(pid, &pstat, 0, NULL) < 0) {
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if (errno != EINTR) {
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serrno = errno;
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break;
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}
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}
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}
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/*
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* If we are the last concurrent instance, restore original signal
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* dispositions. Unblock SIGCHLD, unless it was already blocked.
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*/
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if (__isthreaded)
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_SPINLOCK(&lock);
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if (--concurrent == 0) {
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(void)__libc_sigaction(SIGINT, &ointact, NULL);
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(void)__libc_sigaction(SIGQUIT, &oquitact, NULL);
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}
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if (!sigismember(&osigblock, SIGCHLD))
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(void)__libc_sigprocmask(SIG_UNBLOCK, &sigblock, NULL);
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if (__isthreaded)
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_SPINUNLOCK(&lock);
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if (serrno != 0)
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errno = serrno;
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return (pstat);
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}
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__weak_reference(__libc_system, __system);
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__weak_reference(__libc_system, _system);
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