1 /* $OpenBSD: system.c,v 1.11 2015/10/23 04:44:41 guenther Exp $ */ 2 /* 3 * Copyright (c) 1988 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/types.h> 32 #include <sys/wait.h> 33 #include <errno.h> 34 #include <signal.h> 35 #include <stdlib.h> 36 #include <unistd.h> 37 #include <paths.h> 38 39 extern char **environ; 40 41 int 42 system(const char *command) 43 { 44 pid_t pid, cpid; 45 struct sigaction intsave, quitsave; 46 sigset_t mask, omask; 47 int pstat; 48 char *argp[] = {"sh", "-c", NULL, NULL}; 49 50 if (!command) /* just checking... */ 51 return(1); 52 53 argp[2] = (char *)command; 54 55 sigemptyset(&mask); 56 sigaddset(&mask, SIGCHLD); 57 sigprocmask(SIG_BLOCK, &mask, &omask); 58 switch (cpid = vfork()) { 59 case -1: /* error */ 60 sigprocmask(SIG_SETMASK, &omask, NULL); 61 return(-1); 62 case 0: /* child */ 63 sigprocmask(SIG_SETMASK, &omask, NULL); 64 execve(_PATH_BSHELL, argp, environ); 65 _exit(127); 66 } 67 68 sigaction(SIGINT, NULL, &intsave); 69 sigaction(SIGQUIT, NULL, &quitsave); 70 do { 71 pid = waitpid(cpid, &pstat, 0); 72 } while (pid == -1 && errno == EINTR); 73 sigprocmask(SIG_SETMASK, &omask, NULL); 74 sigaction(SIGINT, &intsave, NULL); 75 sigaction(SIGQUIT, &quitsave, NULL); 76 return (pid == -1 ? -1 : pstat); 77 } 78 DEF_STRONG(system); 79
