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Annotation of 42BSD/usr.lib/libU77/alarm_.c, revision 1.1

1.1     ! root        1: /*
        !             2: char id_alarm[] = "@(#)alarm_.c        1.1";
        !             3:  *
        !             4:  * set an alarm time, arrange for user specified action, and return.
        !             5:  *
        !             6:  * calling sequence:
        !             7:  *     integer flag
        !             8:  *     external alfunc
        !             9:  *     lastiv = alarm (intval, alfunc)
        !            10:  * where:
        !            11:  *     intval  = the alarm interval in seconds; 0 turns off the alarm.
        !            12:  *     alfunc  = the function to be called after the alarm interval,
        !            13:  *
        !            14:  *     The returned value will be the time remaining on the last alarm.
        !            15:  */
        !            16: 
        !            17: #include <signal.h>
        !            18: 
        !            19: long alarm_(sec, proc)
        !            20: long   *sec;
        !            21: int    (* proc)();
        !            22: {
        !            23:        register long   lt;
        !            24: 
        !            25:        lt = alarm(1000);       /* time to maneuver */
        !            26: 
        !            27:        if (*sec)
        !            28:                signal(SIGALRM, proc);
        !            29: 
        !            30:        alarm(*sec);
        !            31:        return(lt);
        !            32: }

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