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1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */2/*3 * include/linux/eventpoll.h ( Efficient event polling implementation )4 * Copyright (C) 2001,...,2006 Davide Libenzi5 *6 * This program is free software; you can redistribute it and/or modify7 * it under the terms of the GNU General Public License as published by8 * the Free Software Foundation; either version 2 of the License, or9 * (at your option) any later version.10 *11 * Davide Libenzi <davidel@xmailserver.org>12 *13 */14 15#ifndef _UAPI_LINUX_EVENTPOLL_H16#define _UAPI_LINUX_EVENTPOLL_H17 18/* For O_CLOEXEC */19#include <linux/fcntl.h>20#include <linux/types.h>21 22/* Flags for epoll_create1. */23#define EPOLL_CLOEXEC O_CLOEXEC24 25/* Valid opcodes to issue to sys_epoll_ctl() */26#define EPOLL_CTL_ADD 127#define EPOLL_CTL_DEL 228#define EPOLL_CTL_MOD 329 30/* Epoll event masks */31#define EPOLLIN (__force __poll_t)0x0000000132#define EPOLLPRI (__force __poll_t)0x0000000233#define EPOLLOUT (__force __poll_t)0x0000000434#define EPOLLERR (__force __poll_t)0x0000000835#define EPOLLHUP (__force __poll_t)0x0000001036#define EPOLLNVAL (__force __poll_t)0x0000002037#define EPOLLRDNORM (__force __poll_t)0x0000004038#define EPOLLRDBAND (__force __poll_t)0x0000008039#define EPOLLWRNORM (__force __poll_t)0x0000010040#define EPOLLWRBAND (__force __poll_t)0x0000020041#define EPOLLMSG (__force __poll_t)0x0000040042#define EPOLLRDHUP (__force __poll_t)0x0000200043 44/*45 * Internal flag - wakeup generated by io_uring, used to detect recursion back46 * into the io_uring poll handler.47 */48#define EPOLL_URING_WAKE ((__force __poll_t)(1U << 27))49 50/* Set exclusive wakeup mode for the target file descriptor */51#define EPOLLEXCLUSIVE ((__force __poll_t)(1U << 28))52 53/*54 * Request the handling of system wakeup events so as to prevent system suspends55 * from happening while those events are being processed.56 *57 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be58 * re-allowed until epoll_wait is called again after consuming the wakeup59 * event(s).60 *61 * Requires CAP_BLOCK_SUSPEND62 */63#define EPOLLWAKEUP ((__force __poll_t)(1U << 29))64 65/* Set the One Shot behaviour for the target file descriptor */66#define EPOLLONESHOT ((__force __poll_t)(1U << 30))67 68/* Set the Edge Triggered behaviour for the target file descriptor */69#define EPOLLET ((__force __poll_t)(1U << 31))70 71/* 72 * On x86-64 make the 64bit structure have the same alignment as the73 * 32bit structure. This makes 32bit emulation easier.74 *75 * UML/x86_64 needs the same packing as x86_6476 */77#ifdef __x86_64__78#define EPOLL_PACKED __attribute__((packed))79#else80#define EPOLL_PACKED81#endif82 83struct epoll_event {84 __poll_t events;85 __u64 data;86} EPOLL_PACKED;87 88struct epoll_params {89 __u32 busy_poll_usecs;90 __u16 busy_poll_budget;91 __u8 prefer_busy_poll;92 93 /* pad the struct to a multiple of 64bits */94 __u8 __pad;95};96 97#define EPOLL_IOC_TYPE 0x8A98#define EPIOCSPARAMS _IOW(EPOLL_IOC_TYPE, 0x01, struct epoll_params)99#define EPIOCGPARAMS _IOR(EPOLL_IOC_TYPE, 0x02, struct epoll_params)100 101#endif /* _UAPI_LINUX_EVENTPOLL_H */102