1 /* 2 * Copyright (c) 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)system.c 5.10 (Berkeley) 2/23/91"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 #include <sys/signal.h> 40 #include <sys/wait.h> 41 #include <stdlib.h> 42 #include <stddef.h> 43 #include <unistd.h> 44 #include <paths.h> 45 46 extern char **environ; 47 48 system(command) 49 const char *command; 50 { 51 union wait pstat; 52 pid_t pid; 53 int omask; 54 sig_t intsave, quitsave; 55 char *argp[] = {"sh", "-c", command, NULL}; 56 57 if (!command) /* just checking... */ 58 return(1); 59 60 omask = sigblock(sigmask(SIGCHLD)); 61 switch(pid = vfork()) { 62 case -1: /* error */ 63 (void)sigsetmask(omask); 64 pstat.w_status = 0; 65 pstat.w_retcode = 127; 66 return(pstat.w_status); 67 case 0: /* child */ 68 (void)sigsetmask(omask); 69 execve(_PATH_BSHELL, argp, environ); 70 _exit(127); 71 } 72 intsave = signal(SIGINT, SIG_IGN); 73 quitsave = signal(SIGQUIT, SIG_IGN); 74 pid = waitpid(pid, (int *)&pstat, 0); 75 (void)sigsetmask(omask); 76 (void)signal(SIGINT, intsave); 77 (void)signal(SIGQUIT, quitsave); 78 return(pid == -1 ? -1 : pstat.w_status); 79 } 80