1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public License as |
6 | published by the Free Software Foundation; either version 2.1 of the |
7 | License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If |
16 | not, see <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <pthread.h> |
20 | #include <time.h> |
21 | |
22 | #include "posix-timer.h" |
23 | |
24 | |
25 | /* Get current value of timer TIMERID and store it in VLAUE. */ |
26 | int |
27 | timer_gettime (timer_t timerid, struct itimerspec *value) |
28 | { |
29 | struct timer_node *timer; |
30 | struct timespec now, expiry; |
31 | int retval = -1, armed = 0, valid; |
32 | clock_t clock = 0; |
33 | |
34 | pthread_mutex_lock (mutex: &__timer_mutex); |
35 | |
36 | timer = timer_id2ptr (timerid); |
37 | valid = timer_valid (timer); |
38 | |
39 | if (valid) { |
40 | armed = timer->armed; |
41 | expiry = timer->expirytime; |
42 | clock = timer->clock; |
43 | value->it_interval = timer->value.it_interval; |
44 | } |
45 | |
46 | pthread_mutex_unlock (mutex: &__timer_mutex); |
47 | |
48 | if (valid) |
49 | { |
50 | if (armed) |
51 | { |
52 | __clock_gettime (clock, &now); |
53 | if (timespec_compare (left: &now, right: &expiry) < 0) |
54 | timespec_sub (diff: &value->it_value, left: &expiry, right: &now); |
55 | else |
56 | { |
57 | value->it_value.tv_sec = 0; |
58 | value->it_value.tv_nsec = 0; |
59 | } |
60 | } |
61 | else |
62 | { |
63 | value->it_value.tv_sec = 0; |
64 | value->it_value.tv_nsec = 0; |
65 | } |
66 | |
67 | retval = 0; |
68 | } |
69 | else |
70 | __set_errno (EINVAL); |
71 | |
72 | return retval; |
73 | } |
74 | |