projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | 28 | |
| 7e040726 GK |
29 | /* Epoll event masks */ |
| 30 | #define EPOLLIN 0x00000001 | |
| 31 | #define EPOLLPRI 0x00000002 | |
| 32 | #define EPOLLOUT 0x00000004 | |
| 33 | #define EPOLLERR 0x00000008 | |
| 34 | #define EPOLLHUP 0x00000010 | |
| 35 | #define EPOLLRDNORM 0x00000040 | |
| 36 | #define EPOLLRDBAND 0x00000080 | |
| 37 | #define EPOLLWRNORM 0x00000100 | |
| 38 | #define EPOLLWRBAND 0x00000200 | |
| 39 | #define EPOLLMSG 0x00000400 | |
| 40 | #define EPOLLRDHUP 0x00002000 | |
| 41 | ||
| df0108c5 | 42 | /* Set exclusive wakeup mode for the target file descriptor */ |
| 6f051e4a | 43 | #define EPOLLEXCLUSIVE (1U << 28) |
| df0108c5 | 44 | |
| 607ca46e DH |
45 | /* |
| 46 | * Request the handling of system wakeup events so as to prevent system suspends | |
| 47 | * from happening while those events are being processed. | |
| 48 | * | |
| 49 | * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be | |
| 50 | * re-allowed until epoll_wait is called again after consuming the wakeup | |
| 51 | * event(s). | |
| 52 | * | |
| 53 | * Requires CAP_BLOCK_SUSPEND | |
| 54 | */ | |
| 6f051e4a | 55 | #define EPOLLWAKEUP (1U << 29) |
| 607ca46e DH |
56 | |
| 57 | /* Set the One Shot behaviour for the target file descriptor */ | |
| 6f051e4a | 58 | #define EPOLLONESHOT (1U << 30) |
| 607ca46e DH |
59 | |
| 60 | /* Set the Edge Triggered behaviour for the target file descriptor */ | |
| 6f051e4a | 61 | #define EPOLLET (1U << 31) |
| 607ca46e DH |
62 | |
| 63 | /* | |
| 64 | * On x86-64 make the 64bit structure have the same alignment as the | |
| 65 | * 32bit structure. This makes 32bit emulation easier. | |
| 66 | * | |
| 67 | * UML/x86_64 needs the same packing as x86_64 | |
| 68 | */ | |
| 69 | #ifdef __x86_64__ | |
| 70 | #define EPOLL_PACKED __attribute__((packed)) | |
| 71 | #else | |
| 72 | #define EPOLL_PACKED | |
| 73 | #endif | |
| 74 | ||
| 75 | struct epoll_event { | |
| 76 | __u32 events; | |
| 77 | __u64 data; | |
| 78 | } EPOLL_PACKED; | |
| 79 | ||
| 95f19f65 AP |
80 | #ifdef CONFIG_PM_SLEEP |
| 81 | static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) | |
| 82 | { | |
| 83 | if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND)) | |
| 84 | epev->events &= ~EPOLLWAKEUP; | |
| 85 | } | |
| 86 | #else | |
| 87 | static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) | |
| 88 | { | |
| 89 | epev->events &= ~EPOLLWAKEUP; | |
| 90 | } | |
| 91 | #endif | |
| 607ca46e | 92 | #endif /* _UAPI_LINUX_EVENTPOLL_H */ |