glibc/support/xtime.h
Adhemerval Zanella a4ed0471d7 Always define __USE_TIME_BITS64 when 64 bit time_t is used
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>
2024-04-02 15:28:36 -03:00

56 lines
1.8 KiB
C

/* Support functionality for using time.
Copyright (C) 2019-2024 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
<https://www.gnu.org/licenses/>. */
#ifndef SUPPORT_TIME_H
#define SUPPORT_TIME_H
#include <time.h>
__BEGIN_DECLS
/* Name of the env variable, which indicates if it is possible to
adjust time on target machine. */
#define SETTIME_ENV_NAME "GLIBC_TEST_ALLOW_TIME_SETTING"
/* The following functions call the corresponding libc functions and
terminate the process on error. */
#ifndef __USE_TIME64_REDIRECTS
void xclock_gettime (clockid_t clock, struct timespec *ts);
void xclock_settime (clockid_t clock, const struct timespec *ts);
#else
void __REDIRECT (xclock_gettime, (clockid_t clock, struct timespec *ts),
xclock_gettime_time64);
void __REDIRECT (xclock_settime, (clockid_t clock, const struct timespec *ts),
xclock_settime_time64);
#endif
/* This helper can often simplify tests by avoiding an explicit
variable declaration or allowing that declaration to be const. */
static inline struct timespec xclock_now (clockid_t clock)
{
struct timespec ts;
xclock_gettime (clock, &ts);
return ts;
}
__END_DECLS
#endif /* SUPPORT_TIME_H */