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 /*
45 * Internal flag - wakeup generated by io_uring, used to detect recursion back
46 * into the io_uring poll handler.
47 */
48 #define EPOLL_URING_WAKE ((__force __poll_t)(1U << 27))
49
50 /* Set exclusive wakeup mode for the target file descriptor */
51 #define EPOLLEXCLUSIVE ((__force __poll_t)(1U << 28))
52
53 /*
54 * Request the handling of system wakeup events so as to prevent system suspends
55 * from happening while those events are being processed.
56 *
57 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be
58 * re-allowed until epoll_wait is called again after consuming the wakeup
59 * event(s).
60 *
61 * Requires CAP_BLOCK_SUSPEND
62 */
63 #define EPOLLWAKEUP ((__force __poll_t)(1U << 29))
64
65 /* Set the One Shot behaviour for the target file descriptor */
66 #define EPOLLONESHOT ((__force __poll_t)(1U << 30))
67
68 /* Set the Edge Triggered behaviour for the target file descriptor */
69 #define EPOLLET ((__force __poll_t)(1U << 31))
70
71 /*
72 * On x86-64 make the 64bit structure have the same alignment as the
73 * 32bit structure. This makes 32bit emulation easier.
74 *
75 * UML/x86_64 needs the same packing as x86_64
76 */
77 #ifdef __x86_64__
78 #define EPOLL_PACKED __attribute__((packed))
79 #else
80 #define EPOLL_PACKED
81 #endif
82
83 struct epoll_event {
84 __poll_t events;
85 __u64 data;
86 } EPOLL_PACKED;
87
88 struct epoll_params {
89 __u32 busy_poll_usecs;
90 __u16 busy_poll_budget;
91 __u8 prefer_busy_poll;
92
93 /* pad the struct to a multiple of 64bits */
94 __u8 __pad;
95 };
96
97 #define EPOLL_IOC_TYPE 0x8A
98 #define EPIOCSPARAMS _IOW(EPOLL_IOC_TYPE, 0x01, struct epoll_params)
99 #define EPIOCGPARAMS _IOR(EPOLL_IOC_TYPE, 0x02, struct epoll_params)
100
101 #endif /* _UAPI_LINUX_EVENTPOLL_H */
102
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