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y2038: linux: Provide __timespec_get64 implementation

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This patch provides new instance of Linux specific timespec_get.c file placed
in ./sysdeps/unix/sysv/linux/.

When compared to this file version from ./time directory, it provides
__timespec_get64 explicit 64 bit function for getting 64 bit time in the
struct __timespec64 (for compilation using C11 standard).
Moreover, a 32 bit version - __timespec_get internally uses
__timespec_get64.

The __timespec_get is now supposed to be used on systems still supporting 32
bit time (__TIMESIZE != 64) - hence the necessary conversion to 32 bit struct
timespec.

Internally the timespec_get uses __clock_gettime64. This patch is necessary
for having architectures with __WORDSIZE == 32 Y2038 safe.

Build tests:
./src/scripts/build-many-glibcs.py glibcs

Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
  https://github.com/lmajewski/meta-y2038 and run tests:
  https://github.com/lmajewski/y2038-tests/commits/master

Above tests were performed with Y2038 redirection applied as well as without
to test proper usage of both __timespec_get64 and __timespec_get.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski 2020-01-15 10:14:23 +01:00
parent 286a01d7ab
commit f1c314d275
2 changed files with 62 additions and 0 deletions
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3
include/time.h
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@ -254,6 +254,7 @@ extern double __difftime (time_t time1, time_t time0);
#if __TIMESIZE == 64
# define __clock_nanosleep_time64 __clock_nanosleep
# define __clock_gettime64 __clock_gettime
# define __timespec_get64 __timespec_get
#else
extern int __clock_nanosleep_time64 (clockid_t clock_id,
int flags, const struct __timespec64 *req,
@ -261,6 +262,8 @@ extern int __clock_nanosleep_time64 (clockid_t clock_id,
libc_hidden_proto (__clock_nanosleep_time64)
extern int __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp);
libc_hidden_proto (__clock_gettime64)
extern int __timespec_get64 (struct __timespec64 *ts, int base);
libc_hidden_proto (__timespec_get64)
#endif
/* Use in the clock_* functions. Size of the field representing the

59
sysdeps/unix/sysv/linux/timespec_get.c Normal file
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@ -0,0 +1,59 @@
/* timespec_get -- get system time - Linux version supporting 64 bit time.
Copyright (C) 2020 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.
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/>. */
#include <time.h>
#include <errno.h>
/* Set TS to calendar time based in time base BASE. */
int
__timespec_get64 (struct __timespec64 *ts, int base)
{
if (base == TIME_UTC)
{
__clock_gettime64 (CLOCK_REALTIME, ts);
return base;
}
return 0;
}
#if __TIMESIZE != 64
libc_hidden_def (__timespec_get64)
int
__timespec_get (struct timespec *ts, int base)
{
int ret;
struct __timespec64 tp64;
ret = __timespec_get64 (&tp64, base);
if (ret == TIME_UTC)
{
if (! in_time_t_range (tp64.tv_sec))
{
__set_errno (EOVERFLOW);
return 0;
}
*ts = valid_timespec64_to_timespec (tp64);
}
return ret;
}
#endif
strong_alias (__timespec_get, timespec_get);