2 * include/linux/eventpoll.h ( Efficient event polling implementation )
3 * Copyright (C) 2001,...,2006 Davide Libenzi
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.
10 * Davide Libenzi <davidel@xmailserver.org>
14 #ifndef _UAPI_LINUX_EVENTPOLL_H
15 #define _UAPI_LINUX_EVENTPOLL_H
18 #include <linux/fcntl.h>
19 #include <linux/types.h>
21 /* Flags for epoll_create1. */
22 #define EPOLL_CLOEXEC O_CLOEXEC
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
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
42 /* Set exclusive wakeup mode for the target file descriptor */
43 #define EPOLLEXCLUSIVE (1U << 28)
46 * Request the handling of system wakeup events so as to prevent system suspends
47 * from happening while those events are being processed.
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
53 * Requires CAP_BLOCK_SUSPEND
55 #define EPOLLWAKEUP (1U << 29)
57 /* Set the One Shot behaviour for the target file descriptor */
58 #define EPOLLONESHOT (1U << 30)
60 /* Set the Edge Triggered behaviour for the target file descriptor */
61 #define EPOLLET (1U << 31)
64 * On x86-64 make the 64bit structure have the same alignment as the
65 * 32bit structure. This makes 32bit emulation easier.
67 * UML/x86_64 needs the same packing as x86_64
70 #define EPOLL_PACKED __attribute__((packed))
80 #ifdef CONFIG_PM_SLEEP
81 static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
83 if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
84 epev->events &= ~EPOLLWAKEUP;
87 static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
89 epev->events &= ~EPOLLWAKEUP;
92 #endif /* _UAPI_LINUX_EVENTPOLL_H */