98cc79a1 |
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 | |
13 | if(clock_gettime(CLOCK_MONOTONIC, start_time) == -1) { |
14 | |
15 | printf("failed to get start time.\n"); |
16 | exit(1); |
17 | } |
18 | |
19 | pause(); |
20 | } |
21 | |
22 | void handle_stop() { |
23 | |
24 | long int start_sec, stop_sec, delta; |
25 | |
26 | if(clock_gettime(CLOCK_MONOTONIC, stop_time) == -1) { |
27 | |
28 | printf("failed to get stop time.\n"); |
29 | exit(1); |
30 | } |
31 | |
32 | start_sec = ((long int) start_time->tv_sec); |
33 | stop_sec = ((long int) stop_time->tv_sec); |
34 | |
35 | delta = stop_sec - start_sec; |
36 | |
37 | printf("%ld seconds elapsed between signals.\n", delta); |
38 | |
39 | done = 1; |
40 | } |
41 | |
42 | int main(int argc, char *argv[]) { |
43 | |
44 | done = 0; |
45 | |
46 | start_time = (struct timespec *) calloc(1, sizeof(struct timespec)); |
47 | stop_time = (struct timespec *) calloc(1, sizeof(struct timespec)); |
48 | |
49 | if(signal(SIGTSTP, handle_start) == SIG_ERR || |
50 | signal(SIGCONT, handle_stop) == SIG_ERR) { |
51 | |
52 | printf("could not bind signal handlers\n"); |
53 | return 1; |
54 | } |
55 | |
56 | terminate_check: |
57 | |
58 | pause(); |
59 | |
60 | if(!done) |
61 | goto terminate_check; |
62 | |
63 | free(start_time); |
64 | free(stop_time); |
65 | |
66 | return 0; |
67 | } |