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/* Copyright (C) 2006-2018 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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
#include <time.h>
#include <sys/poll.h>
#include <kernel-features.h>
#include <sysdep-cancel.h>
#ifdef __NR_pselect6
# ifndef __ASSUME_PSELECT
static int __generic_pselect (int nfds, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds,
const struct timespec *timeout,
const sigset_t *sigmask);
# endif
int
__pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
const struct timespec *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 timespec tval;
if (timeout != NULL)
{
tval = *timeout;
timeout = &tval;
}
/* Note: the system call expects 7 values but on most architectures
we can only pass in 6 directly. If there is an architecture with
support for more parameters a new version of this file needs to
be created. */
struct
{
__syscall_ulong_t ss;
__syscall_ulong_t ss_len;
} data;
data.ss = (__syscall_ulong_t) (uintptr_t) sigmask;
data.ss_len = _NSIG / 8;
int result;
#ifndef CALL_PSELECT6
# define CALL_PSELECT6(nfds, readfds, writefds, exceptfds, timeout, data) \
SYSCALL_CANCEL (pselect6, nfds, readfds, writefds, exceptfds, timeout, data)
#endif
result = CALL_PSELECT6 (nfds, readfds, writefds, exceptfds, timeout,
&data);
# ifndef __ASSUME_PSELECT
if (result == -1 && errno == ENOSYS)
result = __generic_pselect (nfds, readfds, writefds, exceptfds, timeout,
sigmask);
# endif
return result;
}
weak_alias (__pselect, pselect)
/* 64-bit time version */
extern int __y2038_linux_support;
int
__pselect64 (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
const struct __timespec64 *timeout, const sigset_t *sigmask)
{
struct timespec tval32, *timeout32 = NULL;
if (__y2038_linux_support)
{
/* TODO: implement using Linux kernel system call */
}
/* The Linux kernel can in some situations update the timeout value.
We do not want that so use a local variable. */
if (timeout != NULL)
{
if (timeout->tv_sec > INT_MAX)
{
errno = EOVERFLOW;
return -1;
}
tval32.tv_sec = timeout->tv_sec;
tval32.tv_nsec = timeout->tv_nsec;
timeout32 = &tval32;
}
/* Note: the system call expects 7 values but on most architectures
we can only pass in 6 directly. If there is an architecture with
support for more parameters a new version of this file needs to
be created. */
struct
{
__syscall_ulong_t ss;
__syscall_ulong_t ss_len;
} data;
data.ss = (__syscall_ulong_t) (uintptr_t) sigmask;
data.ss_len = _NSIG / 8;
int result;
#ifndef CALL_PSELECT6
# define CALL_PSELECT6(nfds, readfds, writefds, exceptfds, timeout, data) \
SYSCALL_CANCEL (pselect6, nfds, readfds, writefds, exceptfds, timeout32, data)
#endif
result = CALL_PSELECT6 (nfds, readfds, writefds, exceptfds, timeout32,
&data);
# ifndef __ASSUME_PSELECT
if (result == -1 && errno == ENOSYS)
result = __generic_pselect (nfds, readfds, writefds, exceptfds, timeout32,
sigmask);
# endif
return result;
}
# ifndef __ASSUME_PSELECT
# define __pselect static __generic_pselect
# endif
#endif
#ifndef __ASSUME_PSELECT
# include <misc/pselect.c>
#endif
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