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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 Libenzi
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * Davide Libenzi <davidel@xmailserver.org>
12 *
13 */
14
15#ifndef _UAPI_LINUX_EVENTPOLL_H
16#define _UAPI_LINUX_EVENTPOLL_H
17
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_CLOEXEC
24
25/* Valid opcodes to issue to sys_epoll_ctl() */
26#define EPOLL_CTL_ADD 1
27#define EPOLL_CTL_DEL 2
28#define EPOLL_CTL_MOD 3
29
30/* Epoll event masks */
31#define EPOLLIN 0x00000001
32#define EPOLLPRI 0x00000002
33#define EPOLLOUT 0x00000004
34#define EPOLLERR 0x00000008
35#define EPOLLHUP 0x00000010
36#define EPOLLRDNORM 0x00000040
37#define EPOLLRDBAND 0x00000080
38#define EPOLLWRNORM 0x00000100
39#define EPOLLWRBAND 0x00000200
40#define EPOLLMSG 0x00000400
41#define EPOLLRDHUP 0x00002000
42
43/* Set exclusive wakeup mode for the target file descriptor */
44#define EPOLLEXCLUSIVE (1U << 28)
45
46/*
47 * Request the handling of system wakeup events so as to prevent system suspends
48 * from happening while those events are being processed.
49 *
50 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be
51 * re-allowed until epoll_wait is called again after consuming the wakeup
52 * event(s).
53 *
54 * Requires CAP_BLOCK_SUSPEND
55 */
56#define EPOLLWAKEUP (1U << 29)
57
58/* Set the One Shot behaviour for the target file descriptor */
59#define EPOLLONESHOT (1U << 30)
60
61/* Set the Edge Triggered behaviour for the target file descriptor */
62#define EPOLLET (1U << 31)
63
64/*
65 * On x86-64 make the 64bit structure have the same alignment as the
66 * 32bit structure. This makes 32bit emulation easier.
67 *
68 * UML/x86_64 needs the same packing as x86_64
69 */
70#ifdef __x86_64__
71#define EPOLL_PACKED __attribute__((packed))
72#else
73#define EPOLL_PACKED
74#endif
75
76struct epoll_event {
77 __u32 events;
78 __u64 data;
79} EPOLL_PACKED;
80
81#ifdef CONFIG_PM_SLEEP
82static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
83{
84 if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
85 epev->events &= ~EPOLLWAKEUP;
86}
87#else
88static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
89{
90 epev->events &= ~EPOLLWAKEUP;
91}
92#endif
93#endif /* _UAPI_LINUX_EVENTPOLL_H */