1/* clock_gettime -- Get current time from a POSIX clockid_t. Linux version.
2 Copyright (C) 2003-2021 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 <https://www.gnu.org/licenses/>. */
18
19#include <sysdep.h>
20#include <kernel-features.h>
21#include <errno.h>
22#include <time.h>
23#include "kernel-posix-cpu-timers.h"
24#include <sysdep-vdso.h>
25#include <time64-support.h>
26#include <shlib-compat.h>
27
28/* Get current value of CLOCK and store it in TP. */
29int
30__clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp)
31{
32 int r;
33
34#ifndef __NR_clock_gettime64
35# define __NR_clock_gettime64 __NR_clock_gettime
36#endif
37
38 if (supports_time64 ())
39 {
40#ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
41 r = INLINE_VSYSCALL (clock_gettime64, 2, clock_id, tp);
42#else
43 r = INLINE_SYSCALL_CALL (clock_gettime64, clock_id, tp);
44#endif
45
46 if (r == 0 || errno != ENOSYS)
47 return r;
48
49 mark_time64_unsupported ();
50 }
51
52#ifndef __ASSUME_TIME64_SYSCALLS
53 /* Fallback code that uses 32-bit support. */
54 struct timespec tp32;
55# ifdef HAVE_CLOCK_GETTIME_VSYSCALL
56 r = INLINE_VSYSCALL (clock_gettime, 2, clock_id, &tp32);
57# else
58 r = INLINE_SYSCALL_CALL (clock_gettime, clock_id, &tp32);
59# endif
60 if (r == 0)
61 *tp = valid_timespec_to_timespec64 (tp32);
62#endif
63
64 return r;
65}
66
67#if __TIMESIZE != 64
68libc_hidden_def (__clock_gettime64)
69
70int
71__clock_gettime (clockid_t clock_id, struct timespec *tp)
72{
73 int ret;
74 struct __timespec64 tp64;
75
76 ret = __clock_gettime64 (clock_id, &tp64);
77
78 if (ret == 0)
79 {
80 if (! in_time_t_range (tp64.tv_sec))
81 {
82 __set_errno (EOVERFLOW);
83 return -1;
84 }
85
86 *tp = valid_timespec64_to_timespec (tp64);
87 }
88
89 return ret;
90}
91#endif
92libc_hidden_def (__clock_gettime)
93
94versioned_symbol (libc, __clock_gettime, clock_gettime, GLIBC_2_17);
95/* clock_gettime moved to libc in version 2.17;
96 old binaries may expect the symbol version it had in librt. */
97#if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
98strong_alias (__clock_gettime, __clock_gettime_2);
99compat_symbol (libc, __clock_gettime_2, clock_gettime, GLIBC_2_2);
100#endif
101