projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |
| 45cd74cb | 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 | */ | |
| 45cd74cb | 57 | #define EPOLLWAKEUP ((__force __poll_t)(1U << 29)) |
| 607ca46e DH |
58 | |
| 59 | /* Set the One Shot behaviour for the target file descriptor */ | |
| 45cd74cb | 60 | #define EPOLLONESHOT ((__force __poll_t)(1U << 30)) |
| 607ca46e DH |
61 | |
| 62 | /* Set the Edge Triggered behaviour for the target file descriptor */ | |
| 45cd74cb | 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 */ |