mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 06:10:10 +00:00
ecf2661281
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. This also avoids the need to use supports_time64() (which breaks the usage case of live migration like CRIU or similar). 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>
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* Copyright (C) 2006-2021 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>, 2006.
|
|
|
|
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; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <time.h>
|
|
#include <sys/poll.h>
|
|
#include <sysdep-cancel.h>
|
|
|
|
int
|
|
__ppoll64 (struct pollfd *fds, nfds_t nfds, const struct __timespec64 *timeout,
|
|
const sigset_t *sigmask)
|
|
{
|
|
/* The Linux kernel can in some situations update the timeout value.
|
|
We do not want that so use a local variable. */
|
|
struct __timespec64 tval;
|
|
if (timeout != NULL)
|
|
{
|
|
tval = *timeout;
|
|
timeout = &tval;
|
|
}
|
|
|
|
#ifndef __NR_ppoll_time64
|
|
# define __NR_ppoll_time64 __NR_ppoll
|
|
#endif
|
|
|
|
#ifdef __ASSUME_TIME64_SYSCALLS
|
|
return SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask,
|
|
__NSIG_BYTES);
|
|
#else
|
|
int ret;
|
|
bool need_time64 = timeout != NULL && !in_time_t_range (timeout->tv_sec);
|
|
if (need_time64)
|
|
{
|
|
ret = SYSCALL_CANCEL (ppoll_time64, fds, nfds, timeout, sigmask,
|
|
__NSIG_BYTES);
|
|
if (ret == 0 || errno != ENOSYS)
|
|
return ret;
|
|
__set_errno (EOVERFLOW);
|
|
return -1;
|
|
}
|
|
|
|
struct timespec ts32;
|
|
if (timeout != NULL)
|
|
ts32 = valid_timespec64_to_timespec (*timeout);
|
|
|
|
return SYSCALL_CANCEL (ppoll, fds, nfds, timeout ? &ts32 : NULL, sigmask,
|
|
__NSIG_BYTES);
|
|
#endif
|
|
}
|
|
|
|
#if __TIMESIZE != 64
|
|
libc_hidden_def (__ppoll64)
|
|
|
|
int
|
|
__ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
|
|
const sigset_t *sigmask)
|
|
{
|
|
struct __timespec64 ts64;
|
|
if (timeout)
|
|
ts64 = valid_timespec_to_timespec64 (*timeout);
|
|
|
|
return __ppoll64 (fds, nfds, timeout ? &ts64 : NULL, sigmask);
|
|
}
|
|
#endif
|
|
strong_alias (__ppoll, ppoll)
|
|
libc_hidden_def (ppoll)
|