/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note *//* *  include/linux/eventpoll.h ( Efficient event polling implementation ) *  Copyright (C) 2001,...,2006	 Davide Libenzi * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or *  (at your option) any later version. * *  Davide Libenzi <davidel@xmailserver.org> * */ #ifndef _UAPI_LINUX_EVENTPOLL_H#define _UAPI_LINUX_EVENTPOLL_H /* For O_CLOEXEC */#include <linux/fcntl.h>#include <linux/types.h> /* Flags for epoll_create1.  */#define EPOLL_CLOEXEC O_CLOEXEC /* Valid opcodes to issue to sys_epoll_ctl() */#define EPOLL_CTL_ADD 1#define EPOLL_CTL_DEL 2#define EPOLL_CTL_MOD 3 /* Epoll event masks */#define EPOLLIN		(__force __poll_t)0x00000001#define EPOLLPRI	(__force __poll_t)0x00000002#define EPOLLOUT	(__force __poll_t)0x00000004#define EPOLLERR	(__force __poll_t)0x00000008#define EPOLLHUP	(__force __poll_t)0x00000010#define EPOLLNVAL	(__force __poll_t)0x00000020#define EPOLLRDNORM	(__force __poll_t)0x00000040#define EPOLLRDBAND	(__force __poll_t)0x00000080#define EPOLLWRNORM	(__force __poll_t)0x00000100#define EPOLLWRBAND	(__force __poll_t)0x00000200#define EPOLLMSG	(__force __poll_t)0x00000400#define EPOLLRDHUP	(__force __poll_t)0x00002000 /* * Internal flag - wakeup generated by io_uring, used to detect recursion back * into the io_uring poll handler. */#define EPOLL_URING_WAKE	((__force __poll_t)(1U << 27)) /* Set exclusive wakeup mode for the target file descriptor */#define EPOLLEXCLUSIVE	((__force __poll_t)(1U << 28)) /* * Request the handling of system wakeup events so as to prevent system suspends * from happening while those events are being processed. * * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be * re-allowed until epoll_wait is called again after consuming the wakeup * event(s). * * Requires CAP_BLOCK_SUSPEND */#define EPOLLWAKEUP	((__force __poll_t)(1U << 29)) /* Set the One Shot behaviour for the target file descriptor */#define EPOLLONESHOT	((__force __poll_t)(1U << 30)) /* Set the Edge Triggered behaviour for the target file descriptor */#define EPOLLET		((__force __poll_t)(1U << 31)) /*  * On x86-64 make the 64bit structure have the same alignment as the * 32bit structure. This makes 32bit emulation easier. * * UML/x86_64 needs the same packing as x86_64 */#ifdef __x86_64__#define EPOLL_PACKED __attribute__((packed))#else#define EPOLL_PACKED#endif struct epoll_event {	__poll_t events;	__u64 data;} EPOLL_PACKED; struct epoll_params {	__u32 busy_poll_usecs;	__u16 busy_poll_budget;	__u8 prefer_busy_poll; 	/* pad the struct to a multiple of 64bits */	__u8 __pad;}; #define EPOLL_IOC_TYPE 0x8A#define EPIOCSPARAMS _IOW(EPOLL_IOC_TYPE, 0x01, struct epoll_params)#define EPIOCGPARAMS _IOR(EPOLL_IOC_TYPE, 0x02, struct epoll_params) #endif /* _UAPI_LINUX_EVENTPOLL_H */