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78 lines
2.9 KiB
78 lines
2.9 KiB
/*
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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 poll.h
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* @brief Wait for events on a set of file descriptors.
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*/
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#include <sys/cdefs.h>
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#include <linux/poll.h>
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#include <signal.h> /* For sigset_t. */
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#include <time.h> /* For timespec. */
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__BEGIN_DECLS
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/** The type of a file descriptor count, used by poll() and ppoll(). */
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typedef unsigned int nfds_t;
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/**
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* [poll(3)](http://man7.org/linux/man-pages/man3/poll.3.html) waits on a set of file descriptors.
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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 poll(struct pollfd* _Nullable __fds, nfds_t __count, int __timeout_ms);
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/**
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* [ppoll(3)](http://man7.org/linux/man-pages/man3/ppoll.3.html) waits on a set of file descriptors
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* or a signal. Set `__timeout` to null for no timeout. Set `__mask` to null to not set the signal
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* mask.
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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 ppoll(struct pollfd* _Nullable __fds, nfds_t __count, const struct timespec* _Nullable __timeout, const sigset_t* _Nullable __mask) __INTRODUCED_IN(21);
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/**
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* Like ppoll() but allows setting a signal mask with RT signals even from a 32-bit process.
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*/
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int ppoll64(struct pollfd* _Nullable __fds, nfds_t __count, const struct timespec* _Nullable __timeout, const sigset64_t* _Nullable __mask) __INTRODUCED_IN(28);
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#if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
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#define _POLL_H_
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#include <bits/fortify/poll.h>
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#undef _POLL_H_
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#endif
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__END_DECLS
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