time/clocktest.c

   1 #include <signal.h>
   2 #include <stdio.h>
   3 #include <time.h>
   4 #include <unistd.h>
   5
   6 volatile int gotit = 0;
   7
   8 void
   9 alarm_handler (int signal)
  10 {
  11     gotit = 1;
  12 }
  13
  14
  15 int
  16 main (int argc, char ** argv)
  17 {
  18   clock_t start, stop;
  19
  20   if (signal(SIGALRM, alarm_handler) == SIG_ERR)
  21     {
  22       perror ("signal");
  23       exit (1);
  24     }
  25   alarm(1);
  26   start = clock ();
  27   while (!gotit);
  28   stop = clock ();
  29
  30   printf ("%ld clock ticks per second (start=%ld,stop=%ld)\n",
  31           stop - start, start, stop);
  32   printf ("CLOCKS_PER_SEC=%d, sysconf(_SC_CLK_TCK)=%ld\n",
  33           CLOCKS_PER_SEC, sysconf(_SC_CLK_TCK));
  34   return 0;
  35 }