lib-src/wakeup.c

   1 /* Program to produce output at regular intervals.  */
   2
   3 #include <stdio.h>
   4 #include <time.h>
   5
   6 struct tm *localtime ();
   7
   8 main (argc, argv)
   9      int argc;
  10      char **argv;
  11 {
  12   int period = 60;
  13   long when;
  14   struct tm *tp;
  15
  16   if (argc > 1)
  17     period = atoi (argv[1]);
  18
  19   while (1)
  20     {
  21       printf ("Wake up!\n");
  22       fflush (stdout);
  23       /* If using a period of 60, produce the output when the minute
  24          changes. */
  25       if (period == 60)
  26         {
  27           time (&when);
  28           tp = localtime (&when);
  29           sleep (60 - tp->tm_sec);
  30         }
  31       else
  32         sleep (period);
  33     }
  34 }