lib-src/wakeup.c

   1 /* Program to produce output at regular intervals.  */
   2
   3 #ifdef HAVE_CONFIG_H
   4 #include <config.h>
   5 #endif
   6
   7 #include <stdio.h>
   8 #include <sys/types.h>
   9
  10 #ifdef TIME_WITH_SYS_TIME
  11 #include <sys/time.h>
  12 #include <time.h>
  13 #else
  14 #ifdef HAVE_SYS_TIME_H
  15 #include <sys/time.h>
  16 #else
  17 #include <time.h>
  18 #endif
  19 #endif
  20
  21 struct tm *localtime ();
  22
  23 void
  24 main (argc, argv)
  25      int argc;
  26      char **argv;
  27 {
  28   int period = 60;
  29   time_t when;
  30   struct tm *tp;
  31
  32   if (argc > 1)
  33     period = atoi (argv[1]);
  34
  35   while (1)
  36     {
  37       /* Make sure wakeup stops when Emacs goes away.  */
  38       if (getppid () == 1)
  39         exit (0);
  40       printf ("Wake up!\n");
  41       fflush (stdout);
  42       /* If using a period of 60, produce the output when the minute
  43          changes. */
  44       if (period == 60)
  45         {
  46           time (&when);
  47           tp = localtime (&when);
  48           sleep (60 - tp->tm_sec);
  49         }
  50       else
  51         sleep (period);
  52     }
  53 }