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
113
114
115
116
117
|
/* clock_gettime -- Get current time from a POSIX clockid_t. Linux version.
Copyright (C) 2003, 2004 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 <errno.h>
#include <sysdep.h>
#include <time.h>
#include <sys/time.h>
#include "kernel-posix-cpu-timers.h"
#ifdef __VDSO_SUPPORT__
#include "ldso.h"
#endif
#if defined(__UCLIBC_USE_TIME64__)
#include "internal/time64_helpers.h"
#endif
#if defined(__UCLIBC_USE_TIME64__) && defined(__NR_clock_gettime64)
#define SYSCALL_GETTIME \
{ \
struct __ts64_struct __ts64; \
retval = INLINE_SYSCALL (clock_gettime64, 2, clock_id, &__ts64); \
if (tp) { \
tp->tv_sec = __ts64.tv_sec; \
tp->tv_nsec = __ts64.tv_nsec; \
} \
break; \
}
#else
#define SYSCALL_GETTIME \
retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp); \
break
#endif
/* The REALTIME and MONOTONIC clock are definitely supported in the kernel. */
#define SYSDEP_GETTIME \
SYSDEP_GETTIME_CPUTIME \
case CLOCK_REALTIME: \
case CLOCK_MONOTONIC: \
SYSCALL_GETTIME
/* We handled the REALTIME clock here. */
#define HANDLED_REALTIME 1
#define HANDLED_CPUTIME 1
#define SYSDEP_GETTIME_CPU SYSCALL_GETTIME
#define SYSDEP_GETTIME_CPUTIME /* Default catches them too. */
static inline int
realtime_gettime (struct timespec *tp)
{
struct timeval tv;
int retval = gettimeofday (&tv, NULL);
if (retval == 0)
/* Convert into `timespec'. */
TIMEVAL_TO_TIMESPEC (&tv, tp);
return retval;
}
int
__libc_clock_gettime (clockid_t clock_id, struct timespec *tp)
{
int retval = -1;
#ifndef HANDLED_REALTIME
struct timeval tv;
#endif
switch (clock_id)
{
#ifdef SYSDEP_GETTIME
SYSDEP_GETTIME;
#endif
#ifndef HANDLED_REALTIME
case CLOCK_REALTIME:
retval = gettimeofday (&tv, NULL);
if (retval == 0)
TIMEVAL_TO_TIMESPEC (&tv, tp);
break;
#endif
default:
#ifdef SYSDEP_GETTIME_CPU
SYSDEP_GETTIME_CPU;
#endif
__set_errno (EINVAL);
break;
}
return retval;
}
/* Get current value of CLOCK and store it in TP. */
int
clock_gettime (clockid_t clock_id, struct timespec *tp)
{
#if defined(__VDSO_SUPPORT__) && defined(ARCH_VDSO_CLOCK_GETTIME)
return ARCH_VDSO_CLOCK_GETTIME(clock_id, tp);
#else
return __libc_clock_gettime(clock_id, tp);
#endif
}
|
