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Annotation of 43BSDReno/lib/libc/stdlib/system.c, revision 1.1.1.1

1.1       root        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: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)system.c   5.9 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <sys/types.h>
                     25: #include <sys/signal.h>
                     26: #include <sys/wait.h>
                     27: #include <stdlib.h>
                     28: #include <stddef.h>
                     29: #include <paths.h>
                     30: 
                     31: system(command)
                     32:        char *command;
                     33: {
                     34:        union wait pstat;
                     35:        pid_t pid, waitpid();
                     36:        int omask;
                     37:        sig_t intsave, quitsave;
                     38: 
                     39:        if (!command)           /* just checking... */
                     40:                return(1);
                     41: 
                     42:        omask = sigblock(sigmask(SIGCHLD));
                     43:        switch(pid = vfork()) {
                     44:        case -1:                        /* error */
                     45:                (void)sigsetmask(omask);
                     46:                pstat.w_status = 0;
                     47:                pstat.w_retcode = 127;
                     48:                return(pstat.w_status);
                     49:        case 0:                         /* child */
                     50:                (void)sigsetmask(omask);
                     51:                execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
                     52:                _exit(127);
                     53:        }
                     54:        intsave = signal(SIGINT, SIG_IGN);
                     55:        quitsave = signal(SIGQUIT, SIG_IGN);
                     56:        pid = waitpid(pid, &pstat, 0);
                     57:        (void)sigsetmask(omask);
                     58:        (void)signal(SIGINT, intsave);
                     59:        (void)signal(SIGQUIT, quitsave);
                     60:        return(pid == -1 ? -1 : pstat.w_status);
                     61: }

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