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1/*
2 * include/linux/eventpoll.h ( Efficient event polling implementation )
3 * Copyright (C) 2001,...,2006 Davide Libenzi
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * Davide Libenzi <davidel@xmailserver.org>
11 *
12 */
13
14#ifndef _UAPI_LINUX_EVENTPOLL_H
15#define _UAPI_LINUX_EVENTPOLL_H
16
17/* For O_CLOEXEC */
18#include <linux/fcntl.h>
19#include <linux/types.h>
20
21/* Flags for epoll_create1. */
22#define EPOLL_CLOEXEC O_CLOEXEC
23
24/* Valid opcodes to issue to sys_epoll_ctl() */
25#define EPOLL_CTL_ADD 1
26#define EPOLL_CTL_DEL 2
27#define EPOLL_CTL_MOD 3
28
29/* Epoll event masks */
30#define EPOLLIN 0x00000001
31#define EPOLLPRI 0x00000002
32#define EPOLLOUT 0x00000004
33#define EPOLLERR 0x00000008
34#define EPOLLHUP 0x00000010
35#define EPOLLRDNORM 0x00000040
36#define EPOLLRDBAND 0x00000080
37#define EPOLLWRNORM 0x00000100
38#define EPOLLWRBAND 0x00000200
39#define EPOLLMSG 0x00000400
40#define EPOLLRDHUP 0x00002000
41
42/* Set exclusive wakeup mode for the target file descriptor */
43#define EPOLLEXCLUSIVE (1U << 28)
44
45/*
46 * Request the handling of system wakeup events so as to prevent system suspends
47 * from happening while those events are being processed.
48 *
49 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be
50 * re-allowed until epoll_wait is called again after consuming the wakeup
51 * event(s).
52 *
53 * Requires CAP_BLOCK_SUSPEND
54 */
55#define EPOLLWAKEUP (1U << 29)
56
57/* Set the One Shot behaviour for the target file descriptor */
58#define EPOLLONESHOT (1U << 30)
59
60/* Set the Edge Triggered behaviour for the target file descriptor */
61#define EPOLLET (1U << 31)
62
63/*
64 * On x86-64 make the 64bit structure have the same alignment as the
65 * 32bit structure. This makes 32bit emulation easier.
66 *
67 * UML/x86_64 needs the same packing as x86_64
68 */
69#ifdef __x86_64__
70#define EPOLL_PACKED __attribute__((packed))
71#else
72#define EPOLL_PACKED
73#endif
74
75struct epoll_event {
76 __u32 events;
77 __u64 data;
78} EPOLL_PACKED;
79
80#ifdef CONFIG_PM_SLEEP
81static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
82{
83 if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
84 epev->events &= ~EPOLLWAKEUP;
85}
86#else
87static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
88{
89 epev->events &= ~EPOLLWAKEUP;
90}
91#endif
92#endif /* _UAPI_LINUX_EVENTPOLL_H */