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8be918b7 | 1 | /* Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. |
13fa3676 UD |
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 Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 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 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
18 | ||
19 | #include <errno.h> | |
8be918b7 | 20 | #include <time.h> |
13fa3676 | 21 | #include <unistd.h> |
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22 | |
23 | ||
24 | #ifndef EXTRA_CLOCK_CASES | |
25 | # define EXTRA_CLOCK_CASES | |
26 | #endif | |
27 | ||
28 | /* Get resolution of clock. */ | |
29 | int | |
30 | clock_getres (clockid_t clock_id, struct timespec *res) | |
31 | { | |
4a199526 | 32 | int retval = -1; |
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33 | |
34 | switch (clock_id) | |
35 | { | |
36 | case CLOCK_REALTIME: | |
37 | { | |
38 | long int clk_tck = sysconf (_SC_CLK_TCK); | |
39 | ||
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40 | if (__builtin_expect (clk_tck != -1, 1)) |
41 | { | |
42 | /* This implementation assumes that the realtime clock has a | |
43 | resolution higher than 1 second. This is the case for any | |
44 | reasonable implementation. */ | |
45 | res->tv_sec = 0; | |
46 | res->tv_nsec = 1000000000 / clk_tck; | |
47 | ||
48 | retval = 0; | |
49 | } | |
50 | } | |
51 | break; | |
52 | ||
53 | EXTRA_CLOCK_CASES | |
54 | ||
55 | default: | |
56 | __set_errno (EINVAL); | |
13fa3676 UD |
57 | break; |
58 | } | |
59 | ||
60 | return retval; | |
61 | } |