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This patch provides new ___adjtimex64 explicit 64 bit function for adjusting Linux kernel clock. Internally, the __clock_adjtime64 syscall is used. This patch is necessary for having architectures with __WORDSIZE == 32 Y2038 safe. Moreover, a 32 bit version - ___adjtimex has been refactored to internally use ___adjtimex64. The ___adjtimex is now supposed to be used on systems still supporting 32 bit time (__TIMESIZE != 64) - hence the necessary conversions between struct timex and 64 bit struct __timex64. Last but not least, in ___adjtimex64 function the __clock_adjtime syscall has been replaced with __clock_adjtime64 to support 64 bit time on architectures with __WORDSIZE == 32 and __TIMESIZE != 64. 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 the proper usage of both ___adjtimex64 and ___adjtimex. Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/* Tune kernel clock. Linux specific syscall.
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Copyright (C) 2019-2020 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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<http://www.gnu.org/licenses/>. */
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#include <sys/timex.h>
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#include <sysdep.h>
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int
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___adjtimex64 (struct __timex64 *tx64)
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{
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return __clock_adjtime64 (CLOCK_REALTIME, tx64);
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}
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#if __TIMESIZE != 64
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libc_hidden_def (___adjtimex64)
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int
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___adjtimex (struct timex *tx)
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{
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struct __timex64 tx64;
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int retval;
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tx64 = valid_timex_to_timex64 (*tx);
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retval = ___adjtimex64 (&tx64);
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*tx = valid_timex64_to_timex (tx64);
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return retval;
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}
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#endif
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#ifdef VERSION_adjtimex
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weak_alias (___adjtimex, __wadjtimex);
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weak_alias (___adjtimex, __wnadjtime);
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default_symbol_version (___adjtimex, __adjtimex, VERSION_adjtimex);
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default_symbol_version (__wadjtimex, adjtimex, VERSION_adjtimex);
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default_symbol_version (__wnadjtime, ntp_adjtime, VERSION_adjtimex);
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libc_hidden_ver (___adjtimex, __adjtimex);
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#else
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strong_alias (___adjtimex, __adjtimex)
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weak_alias (___adjtimex, adjtimex)
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weak_alias (___adjtimex, ntp_adjtime)
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libc_hidden_def (__adjtimex)
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#endif
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