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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#define EPOLL_CTL_DISABLE 4
29
30/*
31 * Request the handling of system wakeup events so as to prevent system suspends
32 * from happening while those events are being processed.
33 *
34 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be
35 * re-allowed until epoll_wait is called again after consuming the wakeup
36 * event(s).
37 *
38 * Requires CAP_BLOCK_SUSPEND
39 */
40#define EPOLLWAKEUP (1 << 29)
41
42/* Set the One Shot behaviour for the target file descriptor */
43#define EPOLLONESHOT (1 << 30)
44
45/* Set the Edge Triggered behaviour for the target file descriptor */
46#define EPOLLET (1 << 31)
47
48/*
49 * On x86-64 make the 64bit structure have the same alignment as the
50 * 32bit structure. This makes 32bit emulation easier.
51 *
52 * UML/x86_64 needs the same packing as x86_64
53 */
54#ifdef __x86_64__
55#define EPOLL_PACKED __attribute__((packed))
56#else
57#define EPOLL_PACKED
58#endif
59
60struct epoll_event {
61 __u32 events;
62 __u64 data;
63} EPOLL_PACKED;
64
65
66#endif /* _UAPI_LINUX_EVENTPOLL_H */