1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #pragma once 30 31 /** 32 * @file poll.h 33 * @brief Wait for events on a set of file descriptors. 34 */ 35 36 #include <sys/cdefs.h> 37 #include <linux/poll.h> 38 #include <signal.h> /* For sigset_t. */ 39 #include <time.h> /* For timespec. */ 40 41 __BEGIN_DECLS 42 43 /** The type of a file descriptor count, used by poll() and ppoll(). */ 44 typedef unsigned int nfds_t; 45 46 /** 47 * [poll(3)](http://man7.org/linux/man-pages/man3/poll.3.html) waits on a set of file descriptors. 48 * 49 * Returns the number of ready file descriptors on success, 0 for timeout, 50 * and returns -1 and sets `errno` on failure. 51 */ 52 int poll(struct pollfd* _Nullable __fds, nfds_t __count, int __timeout_ms); 53 54 /** 55 * [ppoll(3)](http://man7.org/linux/man-pages/man3/ppoll.3.html) waits on a set of file descriptors 56 * or a signal. Set `__timeout` to null for no timeout. Set `__mask` to null to not set the signal 57 * mask. 58 * 59 * Returns the number of ready file descriptors on success, 0 for timeout, 60 * and returns -1 and sets `errno` on failure. 61 * 62 * Available since API level 28. 63 */ 64 int ppoll(struct pollfd* _Nullable __fds, nfds_t __count, const struct timespec* _Nullable __timeout, const sigset_t* _Nullable __mask) __INTRODUCED_IN(21); 65 66 /** 67 * Like ppoll() but allows setting a signal mask with RT signals even from a 32-bit process. 68 */ 69 int ppoll64(struct pollfd* _Nullable __fds, nfds_t __count, const struct timespec* _Nullable __timeout, const sigset64_t* _Nullable __mask) __INTRODUCED_IN(28); 70 71 #if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS) 72 #define _POLL_H_ 73 #include <bits/fortify/poll.h> 74 #undef _POLL_H_ 75 #endif 76 77 __END_DECLS 78
