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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>
113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/* Copyright (C) 2002-2021 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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#ifndef _SEMAPHORE_H
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#define _SEMAPHORE_H 1
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#include <features.h>
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#include <sys/types.h>
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#ifdef __USE_XOPEN2K
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# include <bits/types/struct_timespec.h>
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#endif
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/* Get the definition for sem_t. */
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#include <bits/semaphore.h>
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__BEGIN_DECLS
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/* Initialize semaphore object SEM to VALUE. If PSHARED then share it
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with other processes. */
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extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value)
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__THROW __nonnull ((1));
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/* Free resources associated with semaphore object SEM. */
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extern int sem_destroy (sem_t *__sem) __THROW __nonnull ((1));
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/* Open a named semaphore NAME with open flags OFLAG. */
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extern sem_t *sem_open (const char *__name, int __oflag, ...)
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__THROW __nonnull ((1));
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/* Close descriptor for named semaphore SEM. */
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extern int sem_close (sem_t *__sem) __THROW __nonnull ((1));
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/* Remove named semaphore NAME. */
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extern int sem_unlink (const char *__name) __THROW __nonnull ((1));
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/* Wait for SEM being posted.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int sem_wait (sem_t *__sem) __nonnull ((1));
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#ifdef __USE_XOPEN2K
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/* Similar to `sem_wait' but wait only until ABSTIME.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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# ifndef __USE_TIME_BITS64
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extern int sem_timedwait (sem_t *__restrict __sem,
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const struct timespec *__restrict __abstime)
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__nonnull ((1, 2));
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT (sem_timedwait,
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(sem_t *__restrict __sem,
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const struct timespec *__restrict __abstime),
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__sem_timedwait64)
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__nonnull ((1, 2));
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# else
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# define sem_timedwait __sem_timedwait64
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# endif
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# endif
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#endif
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#ifdef __USE_GNU
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# ifndef __USE_TIME_BITS64
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extern int sem_clockwait (sem_t *__restrict __sem,
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clockid_t clock,
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const struct timespec *__restrict __abstime)
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__nonnull ((1, 3));
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# else
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# ifdef __REDIRECT
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extern int __REDIRECT (sem_clockwait,
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(sem_t *__restrict __sem,
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clockid_t clock,
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const struct timespec *__restrict __abstime),
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__sem_clockwait64)
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__nonnull ((1, 3));
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# else
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# define sem_clockwait __sem_clockwait64
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# endif
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# endif
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#endif
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/* Test whether SEM is posted. */
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extern int sem_trywait (sem_t *__sem) __THROWNL __nonnull ((1));
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/* Post SEM. */
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extern int sem_post (sem_t *__sem) __THROWNL __nonnull ((1));
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/* Get current value of SEM and store it in *SVAL. */
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extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval)
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__THROW __nonnull ((1, 2));
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__END_DECLS
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#endif /* semaphore.h */
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