1 /* Copyright (C) 2000, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
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 License as
7 published by the Free Software Foundation; either version 2.1 of the
8 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; see the file COPYING.LIB. If
17 not, see <http://www.gnu.org/licenses/>. */
18
19 #include <errno.h>
20 #include <pthread.h>
21 #include <time.h>
22
23 #include "posix-timer.h"
24
25
26 /* Get current value of timer TIMERID and store it in VLAUE. */
27 int
timer_gettime(timerid,value)28 timer_gettime (timerid, value)
29 timer_t timerid;
30 struct itimerspec *value;
31 {
32 struct timer_node *timer;
33 struct timespec now, expiry;
34 int retval = -1, armed = 0, valid;
35 clock_t clock = 0;
36
37 pthread_mutex_lock (&__timer_mutex);
38
39 timer = timer_id2ptr (timerid);
40 valid = timer_valid (timer);
41
42 if (valid) {
43 armed = timer->armed;
44 expiry = timer->expirytime;
45 clock = timer->clock;
46 value->it_interval = timer->value.it_interval;
47 }
48
49 pthread_mutex_unlock (&__timer_mutex);
50
51 if (valid)
52 {
53 if (armed)
54 {
55 clock_gettime (clock, &now);
56 if (timespec_compare (&now, &expiry) < 0)
57 timespec_sub (&value->it_value, &expiry, &now);
58 else
59 {
60 value->it_value.tv_sec = 0;
61 value->it_value.tv_nsec = 0;
62 }
63 }
64 else
65 {
66 value->it_value.tv_sec = 0;
67 value->it_value.tv_nsec = 0;
68 }
69
70 retval = 0;
71 }
72 else
73 __set_errno (EINVAL);
74
75 return retval;
76 }
77