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eef7913c2f
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/* Copyright (C) 1995-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, August 1995.
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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 <sys/sem.h>
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#include <ipc_priv.h>
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#include <sysdep.h>
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#include <errno.h>
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static int
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semtimedop_syscall (int semid, struct sembuf *sops, size_t nsops,
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const struct __timespec64 *timeout)
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{
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#ifdef __NR_semtimedop_time64
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return INLINE_SYSCALL_CALL (semtimedop_time64, semid, sops, nsops, timeout);
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#elif defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS && defined __NR_semtimedop
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return INLINE_SYSCALL_CALL (semtimedop, semid, sops, nsops, timeout);
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#else
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return INLINE_SYSCALL_CALL (ipc, IPCOP_semtimedop, semid,
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SEMTIMEDOP_IPC_ARGS (nsops, sops, timeout));
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#endif
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}
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/* Perform user-defined atomical operation of array of semaphores. */
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int
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__semtimedop64 (int semid, struct sembuf *sops, size_t nsops,
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const struct __timespec64 *timeout)
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{
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#ifdef __ASSUME_TIME64_SYSCALLS
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return semtimedop_syscall (semid, sops, nsops, timeout);
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#else
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bool need_time64 = timeout != NULL && !in_time_t_range (timeout->tv_sec);
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if (need_time64)
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{
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int r = semtimedop_syscall (semid, sops, nsops, timeout);
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if (r == 0 || errno != ENOSYS)
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return r;
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__set_errno (EOVERFLOW);
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return -1;
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}
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struct timespec ts32, *pts32 = NULL;
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if (timeout != NULL)
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{
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ts32 = valid_timespec64_to_timespec (*timeout);
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pts32 = &ts32;
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}
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# ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
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return INLINE_SYSCALL_CALL (semtimedop, semid, sops, nsops, pts32);
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# else
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return INLINE_SYSCALL_CALL (ipc, IPCOP_semtimedop, semid,
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SEMTIMEDOP_IPC_ARGS (nsops, sops, pts32));
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# endif
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#endif
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}
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#if __TIMESIZE != 64
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libc_hidden_def (__semtimedop64)
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int
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__semtimedop (int semid, struct sembuf *sops, size_t nsops,
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const struct timespec *timeout)
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{
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struct __timespec64 ts64, *pts64 = NULL;
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if (timeout != NULL)
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{
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ts64 = valid_timespec_to_timespec64 (*timeout);
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pts64 = &ts64;
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}
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return __semtimedop64 (semid, sops, nsops, pts64);
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}
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#endif
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weak_alias (__semtimedop, semtimedop)
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