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1/* clock_getres -- Get the resolution of a POSIX clockid_t.
2 Copyright (C) 1999-2019 Free Software Foundation, Inc.
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 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <stdint.h>
21#include <time.h>
22#include <unistd.h>
23#include <sys/param.h>
24#include <libc-internal.h>
25
26
27static inline int
28realtime_getres (struct timespec *res)
29{
30 long int clk_tck = __sysconf (_SC_CLK_TCK);
31
32 if (__glibc_likely (clk_tck != -1))
33 {
34 /* This implementation assumes that the realtime clock has a
35 resolution higher than 1 second. This is the case for any
36 reasonable implementation. */
37 res->tv_sec = 0;
38 res->tv_nsec = 1000000000 / clk_tck;
39 return 0;
40 }
41
42 return -1;
43}
44
45
46/* Get resolution of clock. */
47int
48__clock_getres (clockid_t clock_id, struct timespec *res)
49{
50 int retval = -1;
51
52 switch (clock_id)
53 {
54 case CLOCK_REALTIME:
55 retval = realtime_getres (res);
56 break;
57
58 default:
59 __set_errno (EINVAL);
60 break;
61 }
62
63 return retval;
64}
65weak_alias (__clock_getres, clock_getres)
66

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