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