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 void
  22 main (argc, argv)
  23      int argc;
  24      char **argv;
  25 {
  26   int period = 60;
  27   time_t when;
  28   struct tm *tp;
  29
  30   if (argc > 1)
  31     period = atoi (argv[1]);
  32
  33   while (1)
  34     {
  35       /* Make sure wakeup stops when Emacs goes away.  */
  36       if (getppid () == 1)
  37         exit (0);
  38       printf ("Wake up!\n");
  39       fflush (stdout);
  40       /* If using a period of 60, produce the output when the minute
  41          changes. */
  42       if (period == 60)
  43         {
  44           time (&when);
  45           tp = localtime (&when);
  46           sleep (60 - tp->tm_sec);
  47         }
  48       else
  49         sleep (period);
  50     }
  51 }