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A new build flag, _TIME_BITS, enables the usage of the newer 64-bit
time symbols for legacy ABI (where 32-bit time_t is default). The 64
bit time support is only enabled if LFS (_FILE_OFFSET_BITS=64) is
also used.
Different than LFS support, the y2038 symbols are added only for the
required ABIs (armhf, csky, hppa, i386, m68k, microblaze, mips32,
mips64-n32, nios2, powerpc32, sparc32, s390-32, and sh). The ABIs with
64-bit time support are unchanged, both for symbol and types
redirection.
On Linux the full 64-bit time support requires a minimum of kernel
version v5.1. Otherwise, the 32-bit fallbacks are used and might
results in error with overflow return code (EOVERFLOW).
The i686-gnu does not yet support 64-bit time.
This patch exports following rediretions to support 64-bit time:
* libc:
adjtime
adjtimex
clock_adjtime
clock_getres
clock_gettime
clock_nanosleep
clock_settime
cnd_timedwait
ctime
ctime_r
difftime
fstat
fstatat
futimens
futimes
futimesat
getitimer
getrusage
gettimeofday
gmtime
gmtime_r
localtime
localtime_r
lstat_time
lutimes
mktime
msgctl
mtx_timedlock
nanosleep
nanosleep
ntp_gettime
ntp_gettimex
ppoll
pselec
pselect
pthread_clockjoin_np
pthread_cond_clockwait
pthread_cond_timedwait
pthread_mutex_clocklock
pthread_mutex_timedlock
pthread_rwlock_clockrdlock
pthread_rwlock_clockwrlock
pthread_rwlock_timedrdlock
pthread_rwlock_timedwrlock
pthread_timedjoin_np
recvmmsg
sched_rr_get_interval
select
sem_clockwait
semctl
semtimedop
sem_timedwait
setitimer
settimeofday
shmctl
sigtimedwait
stat
thrd_sleep
time
timegm
timerfd_gettime
timerfd_settime
timespec_get
utime
utimensat
utimes
utimes
wait3
wait4
* librt:
aio_suspend
mq_timedreceive
mq_timedsend
timer_gettime
timer_settime
* libanl:
gai_suspend
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/* System-dependent timing definitions. Linux version.
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Copyright (C) 1996-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/*
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* Never include this file directly; use <time.h> instead.
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*/
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#ifndef _BITS_TIME_H
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#define _BITS_TIME_H 1
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#include <bits/types.h>
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/* ISO/IEC 9899:1999 7.23.1: Components of time
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The macro `CLOCKS_PER_SEC' is an expression with type `clock_t' that is
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the number per second of the value returned by the `clock' function. */
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/* CAE XSH, Issue 4, Version 2: <time.h>
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The value of CLOCKS_PER_SEC is required to be 1 million on all
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XSI-conformant systems. */
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#define CLOCKS_PER_SEC ((__clock_t) 1000000)
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#if (!defined __STRICT_ANSI__ || defined __USE_POSIX) \
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&& !defined __USE_XOPEN2K
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/* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK
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presents the real value for clock ticks per second for the system. */
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extern long int __sysconf (int);
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# define CLK_TCK ((__clock_t) __sysconf (2)) /* 2 is _SC_CLK_TCK */
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#endif
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#ifdef __USE_POSIX199309
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/* Identifier for system-wide realtime clock. */
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# define CLOCK_REALTIME 0
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/* Monotonic system-wide clock. */
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# define CLOCK_MONOTONIC 1
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/* High-resolution timer from the CPU. */
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# define CLOCK_PROCESS_CPUTIME_ID 2
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/* Thread-specific CPU-time clock. */
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# define CLOCK_THREAD_CPUTIME_ID 3
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/* Monotonic system-wide clock, not adjusted for frequency scaling. */
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# define CLOCK_MONOTONIC_RAW 4
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/* Identifier for system-wide realtime clock, updated only on ticks. */
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# define CLOCK_REALTIME_COARSE 5
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/* Monotonic system-wide clock, updated only on ticks. */
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# define CLOCK_MONOTONIC_COARSE 6
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/* Monotonic system-wide clock that includes time spent in suspension. */
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# define CLOCK_BOOTTIME 7
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/* Like CLOCK_REALTIME but also wakes suspended system. */
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# define CLOCK_REALTIME_ALARM 8
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/* Like CLOCK_BOOTTIME but also wakes suspended system. */
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# define CLOCK_BOOTTIME_ALARM 9
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/* Like CLOCK_REALTIME but in International Atomic Time. */
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# define CLOCK_TAI 11
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/* Flag to indicate time is absolute. */
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# define TIMER_ABSTIME 1
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#endif
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#ifdef __USE_GNU
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# include <bits/timex.h>
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__BEGIN_DECLS
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/* Tune a POSIX clock. */
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extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW;
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#ifdef __USE_TIME_BITS64
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# if defined(__REDIRECT_NTH)
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extern int __REDIRECT_NTH (clock_adjtime, (__clockid_t __clock_id,
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struct timex *__utx),
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__clock_adjtime64);
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# else
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# define clock_adjtime __clock_adjtime64
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# endif
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#endif
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__END_DECLS
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#endif /* use GNU */
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#endif /* bits/time.h */
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