| 1 | #include <signal.h> |
|---|---|
| 2 | #include <stdio.h> |
| 3 | #include <stdlib.h> |
| 4 | #include <time.h> |
| 5 | #include <unistd.h> |
| 6 | #include <stdint.h> |
| 7 | |
| 8 | volatile int gotit = 0; |
| 9 | |
| 10 | static void |
| 11 | alarm_handler (int signal) |
| 12 | { |
| 13 | gotit = 1; |
| 14 | } |
| 15 | |
| 16 | |
| 17 | int |
| 18 | main (int argc, char ** argv) |
| 19 | { |
| 20 | clock_t start, stop; |
| 21 | |
| 22 | if (signal(SIGALRM, handler: alarm_handler) == SIG_ERR) |
| 23 | { |
| 24 | perror ("signal"); |
| 25 | exit (1); |
| 26 | } |
| 27 | alarm(1); |
| 28 | start = clock (); |
| 29 | while (!gotit); |
| 30 | stop = clock (); |
| 31 | |
| 32 | printf (format: "%jd clock ticks per second (start=%jd,stop=%jd)\n", |
| 33 | (intmax_t) (stop - start), (intmax_t) start, (intmax_t) stop); |
| 34 | printf (format: "CLOCKS_PER_SEC=%jd, sysconf(_SC_CLK_TCK)=%ld\n", |
| 35 | (intmax_t) CLOCKS_PER_SEC, sysconf(_SC_CLK_TCK)); |
| 36 | return 0; |
| 37 | } |
| 38 |