1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)system.c 8.1 (Berkeley) 06/04/93"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <sys/wait.h> 14 #include <signal.h> 15 #include <stdlib.h> 16 #include <stddef.h> 17 #include <unistd.h> 18 #include <paths.h> 19 20 system(command) 21 const char *command; 22 { 23 union wait pstat; 24 pid_t pid; 25 int omask; 26 sig_t intsave, quitsave; 27 28 if (!command) /* just checking... */ 29 return(1); 30 31 omask = sigblock(sigmask(SIGCHLD)); 32 switch(pid = vfork()) { 33 case -1: /* error */ 34 (void)sigsetmask(omask); 35 pstat.w_status = 0; 36 pstat.w_retcode = 127; 37 return(pstat.w_status); 38 case 0: /* child */ 39 (void)sigsetmask(omask); 40 execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); 41 _exit(127); 42 } 43 intsave = signal(SIGINT, SIG_IGN); 44 quitsave = signal(SIGQUIT, SIG_IGN); 45 pid = waitpid(pid, (int *)&pstat, 0); 46 (void)sigsetmask(omask); 47 (void)signal(SIGINT, intsave); 48 (void)signal(SIGQUIT, quitsave); 49 return(pid == -1 ? -1 : pstat.w_status); 50 } 51