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92f7b465 | 1 | /* Create a periodic timer. |
581c785b | 2 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
92f7b465 AZ |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <support/check.h> | |
20 | #include <support/support.h> | |
21 | #include <support/xsignal.h> | |
22 | #include <time.h> | |
23 | ||
24 | static void | |
25 | dummy_alrm_handler (int sig) | |
26 | { | |
27 | } | |
28 | ||
29 | timer_t | |
30 | support_create_timer (uint64_t sec, long int nsec, bool repeat, | |
31 | void (*callback)(int)) | |
32 | { | |
33 | struct sigaction sa; | |
34 | sa.sa_handler = callback != NULL ? callback : dummy_alrm_handler; | |
35 | sigemptyset (&sa.sa_mask); | |
36 | sa.sa_flags = 0; | |
37 | xsigaction (SIGALRM, &sa, NULL); | |
38 | ||
39 | struct sigevent ev = { | |
40 | .sigev_notify = SIGEV_SIGNAL, | |
41 | .sigev_signo = SIGALRM | |
42 | }; | |
43 | timer_t timerid; | |
44 | int r = timer_create (CLOCK_REALTIME, &ev, &timerid); | |
45 | if (r == -1) | |
46 | FAIL_EXIT1 ("timer_create: %m"); | |
47 | ||
48 | /* Single timer with 0.1s. */ | |
49 | struct itimerspec its = | |
50 | { | |
51 | { .tv_sec = repeat ? sec : 0, .tv_nsec = repeat ? nsec : 0 }, | |
52 | { .tv_sec = sec, .tv_nsec = nsec } | |
53 | }; | |
54 | r = timer_settime (timerid, 0, &its, NULL); | |
55 | if (r == -1) | |
56 | FAIL_EXIT1 ("timer_settime: %m"); | |
57 | ||
58 | return timerid; | |
59 | } | |
60 | ||
61 | /* Disable the timer TIMER. */ | |
62 | void | |
63 | support_delete_timer (timer_t timer) | |
64 | { | |
65 | int r = timer_delete (timer); | |
66 | if (r == -1) | |
67 | FAIL_EXIT1 ("timer_delete: %m"); | |
68 | xsignal (SIGALRM, SIG_DFL); | |
69 | } |