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e2be04c7 | 1 | /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
607ca46e DH |
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 | |
607ca46e | 29 | |
7e040726 | 30 | /* Epoll event masks */ |
65aaf87b AV |
31 | #define EPOLLIN (__force __poll_t)0x00000001 |
32 | #define EPOLLPRI (__force __poll_t)0x00000002 | |
33 | #define EPOLLOUT (__force __poll_t)0x00000004 | |
34 | #define EPOLLERR (__force __poll_t)0x00000008 | |
35 | #define EPOLLHUP (__force __poll_t)0x00000010 | |
36 | #define EPOLLNVAL (__force __poll_t)0x00000020 | |
37 | #define EPOLLRDNORM (__force __poll_t)0x00000040 | |
38 | #define EPOLLRDBAND (__force __poll_t)0x00000080 | |
39 | #define EPOLLWRNORM (__force __poll_t)0x00000100 | |
40 | #define EPOLLWRBAND (__force __poll_t)0x00000200 | |
41 | #define EPOLLMSG (__force __poll_t)0x00000400 | |
42 | #define EPOLLRDHUP (__force __poll_t)0x00002000 | |
7e040726 | 43 | |
df0108c5 | 44 | /* Set exclusive wakeup mode for the target file descriptor */ |
65aaf87b | 45 | #define EPOLLEXCLUSIVE (__force __poll_t)(1U << 28) |
df0108c5 | 46 | |
607ca46e DH |
47 | /* |
48 | * Request the handling of system wakeup events so as to prevent system suspends | |
49 | * from happening while those events are being processed. | |
50 | * | |
51 | * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be | |
52 | * re-allowed until epoll_wait is called again after consuming the wakeup | |
53 | * event(s). | |
54 | * | |
55 | * Requires CAP_BLOCK_SUSPEND | |
56 | */ | |
65aaf87b | 57 | #define EPOLLWAKEUP (__force __poll_t)(1U << 29) |
607ca46e DH |
58 | |
59 | /* Set the One Shot behaviour for the target file descriptor */ | |
65aaf87b | 60 | #define EPOLLONESHOT (__force __poll_t)(1U << 30) |
607ca46e DH |
61 | |
62 | /* Set the Edge Triggered behaviour for the target file descriptor */ | |
65aaf87b | 63 | #define EPOLLET (__force __poll_t)(1U << 31) |
607ca46e DH |
64 | |
65 | /* | |
66 | * On x86-64 make the 64bit structure have the same alignment as the | |
67 | * 32bit structure. This makes 32bit emulation easier. | |
68 | * | |
69 | * UML/x86_64 needs the same packing as x86_64 | |
70 | */ | |
71 | #ifdef __x86_64__ | |
72 | #define EPOLL_PACKED __attribute__((packed)) | |
73 | #else | |
74 | #define EPOLL_PACKED | |
75 | #endif | |
76 | ||
77 | struct epoll_event { | |
65aaf87b | 78 | __poll_t events; |
607ca46e DH |
79 | __u64 data; |
80 | } EPOLL_PACKED; | |
81 | ||
95f19f65 AP |
82 | #ifdef CONFIG_PM_SLEEP |
83 | static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) | |
84 | { | |
85 | if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND)) | |
86 | epev->events &= ~EPOLLWAKEUP; | |
87 | } | |
88 | #else | |
89 | static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) | |
90 | { | |
91 | epev->events &= ~EPOLLWAKEUP; | |
92 | } | |
93 | #endif | |
607ca46e | 94 | #endif /* _UAPI_LINUX_EVENTPOLL_H */ |