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