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/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#pragma once
/**
* @file sys/select.h
* @brief Wait for events on a set of file descriptors (but use <poll.h> instead).
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <linux/time.h>
#include <signal.h>
__BEGIN_DECLS
typedef unsigned long fd_mask;
/**
* The limit on the largest fd that can be used with this API.
* Use <poll.h> instead.
*/
#define FD_SETSIZE 1024
#define NFDBITS (8 * sizeof(fd_mask))
/**
* The type of a file descriptor set. Limited to 1024 fds.
* Use <poll.h> instead.
*/
typedef struct {
fd_mask fds_bits[FD_SETSIZE/NFDBITS];
} fd_set;
#define __FDELT(fd) ((fd) / NFDBITS)
#define __FDMASK(fd) (1UL << ((fd) % NFDBITS))
#define __FDS_BITS(type,set) (__BIONIC_CAST(static_cast, type, set)->fds_bits)
/* Inline loop so we don't have to declare memset. */
#define FD_ZERO(set) \
do { \
size_t __i; \
for (__i = 0; __i < sizeof(fd_set)/sizeof(fd_mask); ++__i) { \
(set)->fds_bits[__i] = 0; \
} \
} while (0)
void __FD_CLR_chk(int, fd_set*, size_t) __INTRODUCED_IN(21);
void __FD_SET_chk(int, fd_set*, size_t) __INTRODUCED_IN(21);
int __FD_ISSET_chk(int, const fd_set*, size_t) __INTRODUCED_IN(21);
#define __FD_CLR(fd, set) (__FDS_BITS(fd_set*,set)[__FDELT(fd)] &= ~__FDMASK(fd))
#define __FD_SET(fd, set) (__FDS_BITS(fd_set*,set)[__FDELT(fd)] |= __FDMASK(fd))
#define __FD_ISSET(fd, set) ((__FDS_BITS(const fd_set*,set)[__FDELT(fd)] & __FDMASK(fd)) != 0)
#if __ANDROID_API__ >= 21
/** Removes `fd` from the given set. Use <poll.h> instead. */
#define FD_CLR(fd, set) __FD_CLR_chk(fd, set, __bos(set))
/** Adds `fd` to the given set. Use <poll.h> instead. */
#define FD_SET(fd, set) __FD_SET_chk(fd, set, __bos(set))
/** Tests whether `fd` is in the given set. Use <poll.h> instead. */
#define FD_ISSET(fd, set) __FD_ISSET_chk(fd, set, __bos(set))
#else
/** Removes `fd` from the given set. Use <poll.h> instead. */
#define FD_CLR(fd, set) __FD_CLR(fd, set)
/** Adds `fd` to the given set. Use <poll.h> instead. */
#define FD_SET(fd, set) __FD_SET(fd, set)
/** Tests whether `fd` is in the given set. Use <poll.h> instead. */
#define FD_ISSET(fd, set) __FD_ISSET(fd, set)
#endif /* __ANDROID_API >= 21 */
/**
* [select(2)](http://man7.org/linux/man-pages/man2/select.2.html) waits on a
* set of file descriptors. Use poll() instead.
*
* Returns the number of ready file descriptors on success, 0 for timeout,
* and returns -1 and sets `errno` on failure.
*/
int select(int __fd_count, fd_set* __read_fds, fd_set* __write_fds, fd_set* __exception_fds, struct timeval* __timeout);
/**
* [pselect(2)](http://man7.org/linux/man-pages/man2/select.2.html) waits on a
* set of file descriptors. Use ppoll() instead.
*
* Returns the number of ready file descriptors on success, 0 for timeout,
* and returns -1 and sets `errno` on failure.
*/
int pselect(int __fd_count, fd_set* __read_fds, fd_set* __write_fds, fd_set* __exception_fds, const struct timespec* __timeout, const sigset_t* __mask);
/**
* [pselect64(2)](http://man7.org/linux/man-pages/man2/select.2.html) waits on a
* set of file descriptors. Use ppoll64() instead.
*
* Returns the number of ready file descriptors on success, 0 for timeout,
* and returns -1 and sets `errno` on failure.
*
* Available since API level 28.
*/
int pselect64(int __fd_count, fd_set* __read_fds, fd_set* __write_fds, fd_set* __exception_fds, const struct timespec* __timeout, const sigset64_t* __mask) __INTRODUCED_IN(28);
__END_DECLS
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