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1 | #include <stdio.h> |
2 | #include <stdlib.h> |
3 | #include <unistd.h> |
4 | |
5 | #include <signal.h> |
6 | #include <time.h> |
7 | |
8 | struct timespec *start_time, *stop_time; |
9 | int done; |
10 | |
11 | void handle_start() { |
12 | |
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13 | if(clock_gettime(CLOCK_PROCESS_CPUTIME_ID, start_time) == -1) { |
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14 | |
15 | printf("failed to get start time.\n"); |
16 | exit(1); |
17 | } |
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18 | } |
19 | |
20 | void handle_stop() { |
21 | |
22 | long int start_sec, stop_sec, delta; |
23 | |
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24 | if(clock_gettime(CLOCK_PROCESS_CPUTIME_ID, stop_time) == -1) { |
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25 | |
26 | printf("failed to get stop time.\n"); |
27 | exit(1); |
28 | } |
29 | |
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30 | start_sec = ((long int) start_time->tv_nsec); |
31 | stop_sec = ((long int) stop_time->tv_nsec); |
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32 | |
33 | delta = stop_sec - start_sec; |
34 | |
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35 | printf("%ld nanoseconds elapsed between signals.\n", delta); |
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36 | |
37 | done = 1; |
38 | } |
39 | |
40 | int main(int argc, char *argv[]) { |
41 | |
42 | done = 0; |
43 | |
44 | start_time = (struct timespec *) calloc(1, sizeof(struct timespec)); |
45 | stop_time = (struct timespec *) calloc(1, sizeof(struct timespec)); |
46 | |
47 | if(signal(SIGTSTP, handle_start) == SIG_ERR || |
48 | signal(SIGCONT, handle_stop) == SIG_ERR) { |
49 | |
50 | printf("could not bind signal handlers\n"); |
51 | return 1; |
52 | } |
53 | |
54 | terminate_check: |
55 | |
56 | pause(); |
57 | |
58 | if(!done) |
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59 | goto terminate_check; /* sorry */ |
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60 | |
61 | free(start_time); |
62 | free(stop_time); |
63 | |
64 | return 0; |
65 | } |