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glibc/sysdeps/unix/sysv/linux/pselect.c
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/* Copyright (C) 2006-2016 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) | |
# ifndef __ASSUME_PSELECT | |
# define __pselect static __generic_pselect | |
# endif | |
#endif | |
#ifndef __ASSUME_PSELECT | |
# include <misc/pselect.c> | |
#endif |