#include <signal.h> #include <stdio.h> #include <stdlib.h> #include <time.h> #include <unistd.h> volatile int gotit = 0; static void alarm_handler (int signum) { gotit = 1; } int main (int argc, char ** argv) { clock_t start, stop; if (signal(SIGALRM, alarm_handler) == SIG_ERR) { perror ("signal"); exit (1); } alarm(1); start = clock (); while (!gotit); stop = clock (); printf ("%ld clock ticks per second (start=%ld,stop=%ld)\n", stop - start, start, stop); printf ("CLOCKS_PER_SEC=%ld, sysconf(_SC_CLK_TCK)=%ld\n", CLOCKS_PER_SEC, sysconf(_SC_CLK_TCK)); return 0; }