/*- * SPDX-License-Identifier: BSD-3-Clause * * 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. 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 "namespace.h" #include #include #include #include #include #include #include #include #include #include "un-namespace.h" #include "libc_private.h" #pragma weak system int system(const char *command) { return (((int (*)(const char *)) __libc_interposing[INTERPOS_system])(command)); } int __libc_system(const char *command) { pid_t pid, savedpid; int pstat; struct sigaction ign, intact, quitact; sigset_t newsigblock, oldsigblock; if (!command) /* just checking... */ return(1); (void)sigemptyset(&newsigblock); (void)sigaddset(&newsigblock, SIGCHLD); (void)sigaddset(&newsigblock, SIGINT); (void)sigaddset(&newsigblock, SIGQUIT); (void)__libc_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock); switch(pid = vfork()) { /* * In the child, use unwrapped syscalls. libthr is in * undefined state after vfork(). */ case -1: /* error */ (void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); return (-1); case 0: /* child */ /* * Restore original signal dispositions and exec the command. */ (void)__sys_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); _exit(127); } /* * If we are running means that the child has either completed * its execve, or has failed. * Block SIGINT/QUIT because sh -c handles it and wait for * it to clean up. */ memset(&ign, 0, sizeof(ign)); ign.sa_handler = SIG_IGN; (void)sigemptyset(&ign.sa_mask); (void)__libc_sigaction(SIGINT, &ign, &intact); (void)__libc_sigaction(SIGQUIT, &ign, &quitact); savedpid = pid; do { pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0); } while (pid == -1 && errno == EINTR); (void)__libc_sigaction(SIGINT, &intact, NULL); (void)__libc_sigaction(SIGQUIT, &quitact, NULL); (void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); return (pid == -1 ? -1 : pstat); } __weak_reference(__libc_system, __system); __weak_reference(__libc_system, _system);