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