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 are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)system.c 5.6 (Berkeley) 09/21/89"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <sys/types.h> 23 #include <sys/wait.h> 24 #include <sys/signal.h> 25 #include <stdio.h> 26 #include <paths.h> 27 28 system(command) 29 char *command; 30 { 31 union wait pstat; 32 pid_t pid, waitpid(); 33 int omask; 34 sig_t intsave, quitsave; 35 36 omask = sigblock(sigmask(SIGCHLD)); 37 switch(pid = vfork()) { 38 case -1: /* error */ 39 (void)sigsetmask(omask); 40 pstat.w_status = 0; 41 pstat.w_retcode = 127; 42 return(pstat.w_status); 43 case 0: /* child */ 44 (void)sigsetmask(omask); 45 execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); 46 _exit(127); 47 } 48 intsave = signal(SIGINT, SIG_IGN); 49 quitsave = signal(SIGQUIT, SIG_IGN); 50 pid = waitpid(pid, &pstat, 0); 51 (void)sigsetmask(omask); 52 (void)signal(SIGINT, intsave); 53 (void)signal(SIGQUIT, quitsave); 54 return(pid == -1 ? -1 : pstat.w_status); 55 } 56