1 | /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
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 |
29 | |
30 | /* Epoll event masks */ |
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 |
43 | |
44 | /* Set exclusive wakeup mode for the target file descriptor */ |
45 | #define EPOLLEXCLUSIVE ((__force __poll_t)(1U << 28)) |
46 | |
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 | */ |
57 | #define EPOLLWAKEUP ((__force __poll_t)(1U << 29)) |
58 | |
59 | /* Set the One Shot behaviour for the target file descriptor */ |
60 | #define EPOLLONESHOT ((__force __poll_t)(1U << 30)) |
61 | |
62 | /* Set the Edge Triggered behaviour for the target file descriptor */ |
63 | #define EPOLLET ((__force __poll_t)(1U << 31)) |
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 { |
78 | __poll_t events; |
79 | __u64 data; |
80 | } EPOLL_PACKED; |
81 | |
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 |
94 | #endif /* _UAPI_LINUX_EVENTPOLL_H */ |
95 | |