1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/* clock_getres -- Get the resolution of a POSIX clockid_t. Linux version.
Copyright (C) 2003-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <errno.h>
#include <time.h>
#include <y2038-support.h>
#include "kernel-posix-cpu-timers.h"
#ifdef HAVE_CLOCK_GETRES_VSYSCALL
# define HAVE_VSYSCALL
#endif
#include <sysdep-vdso.h>
#define SYSCALL_GETRES \
retval = INLINE_VSYSCALL (clock_getres, 2, clock_id, res); \
break
/* The REALTIME and MONOTONIC clock are definitely supported in the
kernel. */
#define SYSDEP_GETRES \
SYSDEP_GETRES_CPUTIME \
case CLOCK_REALTIME: \
case CLOCK_MONOTONIC: \
case CLOCK_MONOTONIC_RAW: \
case CLOCK_REALTIME_COARSE: \
case CLOCK_MONOTONIC_COARSE: \
SYSCALL_GETRES
/* We handled the REALTIME clock here. */
#define HANDLED_REALTIME 1
#define HANDLED_CPUTIME 1
#define SYSDEP_GETRES_CPU SYSCALL_GETRES
#define SYSDEP_GETRES_CPUTIME /* Default catches them too. */
/* The 64-bit version */
// Call the 32-bit syscall and convert to 64-bit time
#define SYSCALL_GETRES32 \
retval = INLINE_VSYSCALL (clock_getres, 2, clock_id, &ts32); \
if (retval==0) \
{ \
timespec_to_timespec64(&ts32, res); \
res->tv_pad = 0; \
}
#ifdef __NR_clock_getres_time64
/* We are building with a 64-bit-time getres syscall */
#define SYSCALL_GETRES64 \
if (__y2038_linux_support > 0) \
{ \
retval = INLINE_SYSCALL (clock_getres_time64, 2, clock_id, res); \
if (retval == -1 && errno == ENOSYS) \
{ \
__y2038_linux_support = -1; \
SYSCALL_GETRES32; \
} \
} \
else \
{ \
SYSCALL_GETRES32; \
} \
break
#else
/* We are building without a 64-bit-time getres syscall */
#define SYSCALL_GETRES64 \
SYSCALL_GETRES32; \
break
#endif
/* The REALTIME and MONOTONIC clock are definitely supported in the
kernel. */
#define SYSDEP_GETRES64 \
SYSDEP_GETRES_CPUTIME64 \
case CLOCK_REALTIME: \
case CLOCK_MONOTONIC: \
case CLOCK_MONOTONIC_RAW: \
case CLOCK_REALTIME_COARSE: \
case CLOCK_MONOTONIC_COARSE: \
SYSCALL_GETRES64
/* We handled the REALTIME clock here. */
#define HANDLED_REALTIME64 1
#define HANDLED_CPUTIME64 1
#define SYSDEP_GETRES_CPU64 SYSCALL_GETRES64
#define SYSDEP_GETRES_CPUTIME64 \
struct timespec ts32;
#include <sysdeps/posix/clock_getres.c>
|
