| David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 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 |
| David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 28 | |
| 29 | /* |
| 30 | * Request the handling of system wakeup events so as to prevent system suspends |
| 31 | * from happening while those events are being processed. |
| 32 | * |
| 33 | * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be |
| 34 | * re-allowed until epoll_wait is called again after consuming the wakeup |
| 35 | * event(s). |
| 36 | * |
| 37 | * Requires CAP_BLOCK_SUSPEND |
| 38 | */ |
| 39 | #define EPOLLWAKEUP (1 << 29) |
| 40 | |
| 41 | /* Set the One Shot behaviour for the target file descriptor */ |
| 42 | #define EPOLLONESHOT (1 << 30) |
| 43 | |
| 44 | /* Set the Edge Triggered behaviour for the target file descriptor */ |
| 45 | #define EPOLLET (1 << 31) |
| 46 | |
| 47 | /* |
| 48 | * On x86-64 make the 64bit structure have the same alignment as the |
| 49 | * 32bit structure. This makes 32bit emulation easier. |
| 50 | * |
| 51 | * UML/x86_64 needs the same packing as x86_64 |
| 52 | */ |
| 53 | #ifdef __x86_64__ |
| 54 | #define EPOLL_PACKED __attribute__((packed)) |
| 55 | #else |
| 56 | #define EPOLL_PACKED |
| 57 | #endif |
| 58 | |
| 59 | struct epoll_event { |
| 60 | __u32 events; |
| 61 | __u64 data; |
| 62 | } EPOLL_PACKED; |
| 63 | |
| Amit Pundir | 95f19f6 | 2013-11-15 12:56:31 +0530 | [diff] [blame] | 64 | #ifdef CONFIG_PM_SLEEP |
| 65 | static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) |
| 66 | { |
| 67 | if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND)) |
| 68 | epev->events &= ~EPOLLWAKEUP; |
| 69 | } |
| 70 | #else |
| 71 | static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) |
| 72 | { |
| 73 | epev->events &= ~EPOLLWAKEUP; |
| 74 | } |
| 75 | #endif |
| David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 76 | #endif /* _UAPI_LINUX_EVENTPOLL_H */ |