4.3BSD - /usr/src/usr.lib/libU77/alarm_.c

   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: }

Defined functions