system.c
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上传日期:2007-04-14
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文件大小:3k
- /*
- * Copyright (c) 1988 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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 = "from: @(#)system.c 5.10 (Berkeley) 2/23/91";*/
- static char *rcsid = "$Id$";
- #endif /* LIBC_SCCS and not lint */
- #include <pthread.h>
- #include <pthread/paths.h>
- #include <sys/types.h>
- #include <sys/wait.h>
- #include <signal.h>
- #include <stdlib.h>
- #include <stddef.h>
- #include <unistd.h>
- extern char **environ;
- system(command)
- const char *command;
- {
- char *argp[] = {"sh", "-c", "*to be filled in*", NULL};
- void (*intsave)(), (*quitsave)(), (*signal())();
- sigset_t tmp_mask, old_mask;
- int pstat;
- pid_t pid;
- if (!command) /* just checking... */
- return(1);
- argp[2] = (char *) command;
- sigemptyset(&tmp_mask);
- sigaddset(&tmp_mask, SIGCHLD);
- pthread_sigmask(SIG_BLOCK, &tmp_mask, &old_mask);
- switch(pid = fork()) {
- case -1: /* error */
- (void)pthread_sigmask(SIG_SETMASK, &old_mask, NULL);
- return(-1);
- case 0: /* child */
- (void)pthread_sigmask(SIG_SETMASK, &old_mask, NULL);
- execve(_PATH_BSHELL, argp, environ);
- _exit(127);
- }
- intsave = pthread_signal(SIGINT, SIG_IGN);
- quitsave = pthread_signal(SIGQUIT, SIG_IGN);
- pid = waitpid(pid, (int *)&pstat, 0);
- (void)pthread_sigmask(SIG_SETMASK, &old_mask, NULL);
- (void)pthread_signal(SIGQUIT, quitsave);
- (void)pthread_signal(SIGINT, intsave);
- return(pid == -1 ? -1 : pstat);
- }