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/* 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 _LINUX_EVENTPOLL_H
#define _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 (__poll_t)0x00000001
#define EPOLLPRI (__poll_t)0x00000002
#define EPOLLOUT (__poll_t)0x00000004
#define EPOLLERR (__poll_t)0x00000008
#define EPOLLHUP (__poll_t)0x00000010
#define EPOLLNVAL (__poll_t)0x00000020
#define EPOLLRDNORM (__poll_t)0x00000040
#define EPOLLRDBAND (__poll_t)0x00000080
#define EPOLLWRNORM (__poll_t)0x00000100
#define EPOLLWRBAND (__poll_t)0x00000200
#define EPOLLMSG (__poll_t)0x00000400
#define EPOLLRDHUP (__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 ((__poll_t)(1U << 27))
/* Set exclusive wakeup mode for the target file descriptor */
#define EPOLLEXCLUSIVE ((__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 ((__poll_t)(1U << 29))
/* Set the One Shot behaviour for the target file descriptor */
#define EPOLLONESHOT ((__poll_t)(1U << 30))
/* Set the Edge Triggered behaviour for the target file descriptor */
#define EPOLLET ((__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;
#ifdef CONFIG_PM_SLEEP
static __inline__ void ep_take_care_of_epollwakeup(struct epoll_event *epev)
{
if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
epev->events &= ~EPOLLWAKEUP;
}
#else
static __inline__ void ep_take_care_of_epollwakeup(struct epoll_event *epev)
{
epev->events &= ~EPOLLWAKEUP;
}
#endif
#endif /* _LINUX_EVENTPOLL_H */