diff options
Diffstat (limited to 'lib/libc/stdlib/system.c')
| -rw-r--r-- | lib/libc/stdlib/system.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/lib/libc/stdlib/system.c b/lib/libc/stdlib/system.c new file mode 100644 index 0000000..2b298e4 --- /dev/null +++ b/lib/libc/stdlib/system.c @@ -0,0 +1,112 @@ +/* + * 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 <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "namespace.h" +#include <sys/types.h> +#include <sys/wait.h> +#include <signal.h> +#include <stdlib.h> +#include <stddef.h> +#include <string.h> +#include <unistd.h> +#include <paths.h> +#include <errno.h> +#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); |
