mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-03 10:21:05 +00:00
63ff4a6d17
This patch replaces auto generated wrapper (as described in sysdeps/unix/sysv/linux/syscalls.list) for clock_adjtime with one which adds extra support for reading 64 bit time values on machines with __TIMESIZE != 64. To achieve this goal new __clock_adjtime64 explicit 64 bit function for adjusting Linux clock has been added. Moreover, a 32 bit version - __clock_adjtime has been refactored to internally use __clock_adjtime64. The __clock_adjtime is now supposed to be used on systems still supporting 32 bit time (__TIMESIZE != 64) - hence the necessary conversions between 64 bit struct __timespec64 and struct timespec. The new __clock_adjtime64 syscall available from Linux 5.1+ has been used, when applicable. Up till v5.4 in the Linux kernel there was a bug preventing this call from obtaining correct struct's timex time.tv_sec time after time_t overflow (i.e. not being 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 Linux kernel, headers and minimal kernel version for glibc build test matrix: - Linux v5.1 (with clock_adjtime64) and glibc build with v5.1 as minimal kernel version (--enable-kernel="5.1.0") The __ASSUME_TIME64_SYSCALLS flag defined. - Linux v5.1 and default minimal kernel version The __ASSUME_TIME64_SYSCALLS not defined, but kernel supports clock_adjtime64 syscall. - Linux v4.19 (no clock_adjtime64 support) with default minimal kernel version for contemporary glibc (3.2.0) This kernel doesn't support clock_adjtime64 syscall, so the fallback to clock_adjtime is tested. Above tests were performed with Y2038 redirection applied as well as without (so the __TIMESIZE != 64 execution path is checked as well). No regressions were observed. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
/* clock_adjtime -- tune kernel clock.
|
|
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, 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; see the file COPYING.LIB. If
|
|
not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#include <sysdep.h>
|
|
#include <sys/timex.h>
|
|
#include <kernel-features.h>
|
|
|
|
int
|
|
__clock_adjtime64 (const clockid_t clock_id, struct __timex64 *tx64)
|
|
{
|
|
#ifdef __ASSUME_TIME64_SYSCALLS
|
|
# ifndef __NR_clock_adjtime64
|
|
# define __NR_clock_adjtime64 __NR_clock_adjtime
|
|
# endif
|
|
return INLINE_SYSCALL_CALL (clock_adjtime64, clock_id, tx64);
|
|
#else
|
|
int ret = INLINE_SYSCALL_CALL (clock_adjtime64, clock_id, tx64);
|
|
if (errno != ENOSYS)
|
|
return ret;
|
|
|
|
if (tx64->modes & ADJ_SETOFFSET
|
|
&& ! in_time_t_range (tx64->time.tv_sec))
|
|
{
|
|
__set_errno (EOVERFLOW);
|
|
return -1;
|
|
}
|
|
|
|
struct timex tx32 = valid_timex64_to_timex (*tx64);
|
|
int retval = INLINE_SYSCALL_CALL (clock_adjtime, clock_id, &tx32);
|
|
if (retval >= 0)
|
|
*tx64 = valid_timex_to_timex64 (tx32);
|
|
|
|
return retval;
|
|
#endif
|
|
}
|
|
|
|
#if __TIMESIZE != 64
|
|
libc_hidden_def (__clock_adjtime64)
|
|
|
|
int
|
|
__clock_adjtime (const clockid_t clock_id, struct timex *tx)
|
|
{
|
|
struct __timex64 tx64;
|
|
int retval;
|
|
|
|
tx64 = valid_timex_to_timex64 (*tx);
|
|
retval = __clock_adjtime64 (clock_id, &tx64);
|
|
if (retval >= 0)
|
|
*tx = valid_timex64_to_timex (tx64);
|
|
|
|
return retval;
|
|
}
|
|
#endif
|
|
libc_hidden_def (__clock_adjtime);
|
|
strong_alias (__clock_adjtime, clock_adjtime)
|