lib-src/wakeup.c

   1 /* Program to produce output at regular intervals.  */
   2
   3 #include <config.h>
   4
   5 #include <stdio.h>
   6 #include <sys/types.h>
   7
   8 #ifdef TIME_WITH_SYS_TIME
   9 #include <sys/time.h>
  10 #include <time.h>
  11 #else
  12 #ifdef HAVE_SYS_TIME_H
  13 #include <sys/time.h>
  14 #else
  15 #include <time.h>
  16 #endif
  17 #endif
  18
  19 struct tm *localtime ();
  20
  21 main (argc, argv)
  22      int argc;
  23      char **argv;
  24 {
  25   int period = 60;
  26   time_t when;
  27   struct tm *tp;
  28
  29   if (argc > 1)
  30     period = atoi (argv[1]);
  31
  32   while (1)
  33     {
  34       /* Make sure wakeup stops when Emacs goes away.  */
  35       if (getppid () == 1)
  36         exit (0);
  37       printf ("Wake up!\n");
  38       fflush (stdout);
  39       /* If using a period of 60, produce the output when the minute
  40          changes. */
  41       if (period == 60)
  42         {
  43           time (&when);
  44           tp = localtime (&when);
  45           sleep (60 - tp->tm_sec);
  46         }
  47       else
  48         sleep (period);
  49     }
  50 }