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607ca46e DH |
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 | |
607ca46e DH |
28 | |
29 | /* | |
30 | * Request the handling of system wakeup events so as to prevent system suspends | |
31 | * from happening while those events are being processed. | |
32 | * | |
33 | * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be | |
34 | * re-allowed until epoll_wait is called again after consuming the wakeup | |
35 | * event(s). | |
36 | * | |
37 | * Requires CAP_BLOCK_SUSPEND | |
38 | */ | |
39 | #define EPOLLWAKEUP (1 << 29) | |
40 | ||
41 | /* Set the One Shot behaviour for the target file descriptor */ | |
42 | #define EPOLLONESHOT (1 << 30) | |
43 | ||
44 | /* Set the Edge Triggered behaviour for the target file descriptor */ | |
45 | #define EPOLLET (1 << 31) | |
46 | ||
47 | /* | |
48 | * On x86-64 make the 64bit structure have the same alignment as the | |
49 | * 32bit structure. This makes 32bit emulation easier. | |
50 | * | |
51 | * UML/x86_64 needs the same packing as x86_64 | |
52 | */ | |
53 | #ifdef __x86_64__ | |
54 | #define EPOLL_PACKED __attribute__((packed)) | |
55 | #else | |
56 | #define EPOLL_PACKED | |
57 | #endif | |
58 | ||
59 | struct epoll_event { | |
60 | __u32 events; | |
61 | __u64 data; | |
62 | } EPOLL_PACKED; | |
63 | ||
95f19f65 AP |
64 | #ifdef CONFIG_PM_SLEEP |
65 | static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) | |
66 | { | |
67 | if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND)) | |
68 | epev->events &= ~EPOLLWAKEUP; | |
69 | } | |
70 | #else | |
71 | static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) | |
72 | { | |
73 | epev->events &= ~EPOLLWAKEUP; | |
74 | } | |
75 | #endif | |
607ca46e | 76 | #endif /* _UAPI_LINUX_EVENTPOLL_H */ |