mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* Synchronous I/O multiplexing. Linux/microblaze version.
|
|
Copyright (C) 2019-2025 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; 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>
|
|
|
|
#ifndef __ASSUME_TIME64_SYSCALL
|
|
#include <sysdeps/unix/sysv/linux/pselect32.c>
|
|
#elif !defined __ASSUME_PSELECT
|
|
int
|
|
__pselect32 (int nfds, fd_set *readfds, fd_set *writefds,
|
|
fd_set *exceptfds, const struct __timespec64 *timeout,
|
|
const sigset_t *sigmask)
|
|
{
|
|
/* The fallback uses 'select' which shows the race condition regarding
|
|
signal mask set/restore, requires two additional syscalls, and has
|
|
a worse timeout precision (microseconds instead of nanoseconds). */
|
|
|
|
struct timeval tv32, *ptv32 = NULL;
|
|
if (timeout != NULL)
|
|
{
|
|
if (! valid_nanoseconds (timeout->tv_nsec))
|
|
{
|
|
__set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
tv32 = valid_timespec64_to_timeval (*timeout);
|
|
ptv32 = &tv32;
|
|
}
|
|
|
|
sigset_t savemask;
|
|
if (sigmask != NULL)
|
|
__sigprocmask (SIG_SETMASK, sigmask, &savemask);
|
|
|
|
/* select itself is a cancellation entrypoint. */
|
|
int ret = __select (nfds, readfds, writefds, exceptfds, ptv32);
|
|
|
|
if (sigmask != NULL)
|
|
__sigprocmask (SIG_SETMASK, &savemask, NULL);
|
|
|
|
return ret;
|
|
}
|
|
#endif /* __ASSUME_PSELECT */
|