blob: 8a3432d0f0dcb69bf1d0caaf75a363bad02468fa [file] [log] [blame]
/* 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 <>
/* For O_CLOEXEC */
#include <linux/fcntl.h>
#include <linux/types.h>
/* Flags for epoll_create1. */
/* 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
/* 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).
#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))
struct epoll_event {
__poll_t events;
__u64 data;
static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
epev->events &= ~EPOLLWAKEUP;
static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
epev->events &= ~EPOLLWAKEUP;