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Annotation of 3BSD/libc/stdio/system.c, revision 1.1

1.1     ! root        1: #include       <signal.h>
        !             2: 
        !             3: system(s)
        !             4: char *s;
        !             5: {
        !             6:        int status, pid, w;
        !             7:        register int (*istat)(), (*qstat)();
        !             8: 
        !             9:        if ((pid = vfork()) == 0) {
        !            10:                execl("/bin/sh", "sh", "-c", s, 0);
        !            11:                _exit(127);
        !            12:        }
        !            13:        istat = signal(SIGINT, SIG_IGN);
        !            14:        qstat = signal(SIGQUIT, SIG_IGN);
        !            15:        while ((w = wait(&status)) != pid && w != -1)
        !            16:                ;
        !            17:        if (w == -1)
        !            18:                status = -1;
        !            19:        signal(SIGINT, istat);
        !            20:        signal(SIGQUIT, qstat);
        !            21:        return(status);
        !            22: }

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