launchd/testing/EVFILT_TIMER.c

   1 #include <sys/event.h>
   2 #include <sys/time.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include <string.h>
   7 #include <errno.h>
   8 #include <assert.h>
   9
  10 static int kq = -1;
  11
  12 time_t
  13 now_plus_n(int n)
  14 {
  15         time_t later = time(NULL);
  16
  17         return later + n;
  18 }
  19
  20 void
  21 add_abs_timer(int n)
  22 {
  23         struct kevent kev;
  24
  25         EV_SET(&kev, n * 100000, EVFILT_TIMER, EV_ADD, NOTE_SECONDS | NOTE_ABSOLUTE, now_plus_n(n), (void *)n);
  26
  27         assert(kevent(kq, &kev, 1, NULL, 0, NULL) == 0);
  28 }
  29
  30 int
  31 main(void)
  32 {
  33         struct kevent kev;
  34
  35         assert((kq = kqueue()) != -1);
  36
  37         add_abs_timer(2);
  38         add_abs_timer(3);
  39         add_abs_timer(4);
  40         add_abs_timer(5);
  41         add_abs_timer(6);
  42
  43         for (;;) {
  44                 assert(kevent(kq, NULL, 0, &kev, 1, NULL) == 1);
  45                 fprintf(stdout, "kev.ident == %ld kev.udata == %p\n", kev.ident, kev.udata);
  46                 add_abs_timer((int)kev.udata);
  47         }
  48
  49         exit(EXIT_SUCCESS);
  50 }