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 (at) 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 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 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 76 #endif /* _UAPI_LINUX_EVENTPOLL_H */ 77
