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Annotation of 43BSD/usr.lib/libU77/alarm_.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)alarm_.c    5.1     6/7/85
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * set an alarm time, arrange for user specified action, and return.
        !            11:  *
        !            12:  * calling sequence:
        !            13:  *     integer flag
        !            14:  *     external alfunc
        !            15:  *     lastiv = alarm (intval, alfunc)
        !            16:  * where:
        !            17:  *     intval  = the alarm interval in seconds; 0 turns off the alarm.
        !            18:  *     alfunc  = the function to be called after the alarm interval,
        !            19:  *
        !            20:  *     The returned value will be the time remaining on the last alarm.
        !            21:  */
        !            22: 
        !            23: #include <signal.h>
        !            24: 
        !            25: long alarm_(sec, proc)
        !            26: long   *sec;
        !            27: int    (* proc)();
        !            28: {
        !            29:        register long   lt;
        !            30: 
        !            31:        lt = alarm(1000);       /* time to maneuver */
        !            32: 
        !            33:        if (*sec)
        !            34:                signal(SIGALRM, proc);
        !            35: 
        !            36:        alarm(*sec);
        !            37:        return(lt);
        !            38: }

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