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Annotation of researchv9/libc/stdio/system.c, revision 1.1.1.1

1.1       root        1: /* @(#)system.c        4.1 (Berkeley) 12/21/80 */
                      2: #include       <signal.h>
                      3: 
                      4: system(s)
                      5: char *s;
                      6: {
                      7:        int status, pid, w;
                      8:        register int (*istat)(), (*qstat)();
                      9: 
                     10:        if((pid = fork()) == 0){
                     11:                execl("/bin/sh", "sh", "-c", s, 0);
                     12:                _exit(127);
                     13:        } else if(pid < 0)
                     14:                return(pid);
                     15:        istat = signal(SIGINT, SIG_IGN);
                     16:        qstat = signal(SIGQUIT, SIG_IGN);
                     17:        while((w = wait(&status)) != pid && w != -1)
                     18:                ;
                     19:        if (w == -1)
                     20:                status = -1;
                     21:        signal(SIGINT, istat);
                     22:        signal(SIGQUIT, qstat);
                     23:        return(status);
                     24: }

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