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dd535f4f19
It was raised on libc-help [1] that some Linux kernel interfaces expect
the libc to define __USE_TIME_BITS64 to indicate the time_t size for the
kABI. Different than defined by the initial y2038 design document [2],
the __USE_TIME_BITS64 is only defined for ABIs that support more than
one time_t size (by defining the _TIME_BITS for each module).
The 64 bit time_t redirects are now enabled using a different internal
define (__USE_TIME64_REDIRECTS). There is no expected change in semantic
or code generation.
Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, and
arm-linux-gnueabi
[1] https://sourceware.org/pipermail/libc-help/2024-January/006557.html
[2] https://sourceware.org/glibc/wiki/Y2038ProofnessDesign
Reviewed-by: DJ Delorie <dj@redhat.com>
(cherry picked from commit a4ed0471d7)
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* Support functionality for using time.
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Copyright (C) 2019-2024 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 SUPPORT_TIME_H
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#define SUPPORT_TIME_H
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#include <time.h>
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__BEGIN_DECLS
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/* Name of the env variable, which indicates if it is possible to
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adjust time on target machine. */
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#define SETTIME_ENV_NAME "GLIBC_TEST_ALLOW_TIME_SETTING"
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/* The following functions call the corresponding libc functions and
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terminate the process on error. */
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#ifndef __USE_TIME64_REDIRECTS
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void xclock_gettime (clockid_t clock, struct timespec *ts);
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void xclock_settime (clockid_t clock, const struct timespec *ts);
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#else
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void __REDIRECT (xclock_gettime, (clockid_t clock, struct timespec *ts),
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xclock_gettime_time64);
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void __REDIRECT (xclock_settime, (clockid_t clock, const struct timespec *ts),
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xclock_settime_time64);
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#endif
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/* This helper can often simplify tests by avoiding an explicit
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variable declaration or allowing that declaration to be const. */
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static inline struct timespec xclock_now (clockid_t clock)
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{
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struct timespec ts;
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xclock_gettime (clock, &ts);
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return ts;
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}
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__END_DECLS
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#endif /* SUPPORT_TIME_H */
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