| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| volatile int gotit = 0; |
| |
| static void |
| alarm_handler (int signal) |
| { |
| 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; |
| } |