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Annotation of 43BSD/usr.lib/libU77/alarm_.c, revision 1.1.1.1

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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