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a9acb7b39e
Currently glibc uses in_time_t_range to detects time_t overflow, and if it occurs fallbacks to 64 bit syscall version. The function name is confusing because internally time_t might be either 32 bits or 64 bits (depending on __TIMESIZE). This patch refactors the in_time_t_range by replacing it with in_int32_t_range for the case to check if the 64 bit time_t syscall should be used. The in_time_t range is used to detect overflow of the syscall return value. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/* Copyright (C) 2003-2022 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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#include <time.h>
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#include <kernel-features.h>
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#include <errno.h>
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#include <sysdep-cancel.h>
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#include "kernel-posix-cpu-timers.h"
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#include <shlib-compat.h>
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/* We can simply use the syscall. The CPU clocks are not supported
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with this function. */
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int
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__clock_nanosleep_time64 (clockid_t clock_id, int flags,
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const struct __timespec64 *req,
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struct __timespec64 *rem)
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{
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if (clock_id == CLOCK_THREAD_CPUTIME_ID)
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return EINVAL;
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if (clock_id == CLOCK_PROCESS_CPUTIME_ID)
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clock_id = PROCESS_CLOCK;
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/* If the call is interrupted by a signal handler or encounters an error,
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it returns a positive value similar to errno. */
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#ifndef __NR_clock_nanosleep_time64
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# define __NR_clock_nanosleep_time64 __NR_clock_nanosleep
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#endif
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int r;
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#ifdef __ASSUME_TIME64_SYSCALLS
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r = INTERNAL_SYSCALL_CANCEL (clock_nanosleep_time64, clock_id, flags, req,
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rem);
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#else
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if (!in_int32_t_range (req->tv_sec))
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{
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r = INTERNAL_SYSCALL_CANCEL (clock_nanosleep_time64, clock_id, flags,
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req, rem);
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if (r == -ENOSYS)
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r = -EOVERFLOW;
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}
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else
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{
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struct timespec tr32;
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struct timespec ts32 = valid_timespec64_to_timespec (*req);
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r = INTERNAL_SYSCALL_CANCEL (clock_nanosleep, clock_id, flags, &ts32,
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&tr32);
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if (INTERNAL_SYSCALL_ERROR_P (r))
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{
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if (r == -EINTR && rem != NULL && (flags & TIMER_ABSTIME) == 0)
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*rem = valid_timespec_to_timespec64 (tr32);
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}
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}
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#endif
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return -r;
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}
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#if __TIMESIZE != 64
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libc_hidden_def (__clock_nanosleep_time64)
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int
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__clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
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struct timespec *rem)
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{
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int r;
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struct __timespec64 treq64, trem64;
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treq64 = valid_timespec_to_timespec64 (*req);
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r = __clock_nanosleep_time64 (clock_id, flags, &treq64,
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rem != NULL ? &trem64 : NULL);
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if (r == EINTR && rem != NULL && (flags & TIMER_ABSTIME) == 0)
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*rem = valid_timespec64_to_timespec (trem64);
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return r;
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}
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#endif
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libc_hidden_def (__clock_nanosleep)
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versioned_symbol (libc, __clock_nanosleep, clock_nanosleep, GLIBC_2_17);
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/* clock_nanosleep moved to libc in version 2.17;
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old binaries may expect the symbol version it had in librt. */
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#if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
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strong_alias (__clock_nanosleep, __clock_nanosleep_2);
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compat_symbol (libc, __clock_nanosleep_2, clock_nanosleep, GLIBC_2_2);
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#endif
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