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 /* Set exclusive wakeup mode for the target file descriptor */ 30 #define EPOLLEXCLUSIVE (1 << 28) 31 32 /* 33 * Request the handling of system wakeup events so as to prevent system suspends 34 * from happening while those events are being processed. 35 * 36 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be 37 * re-allowed until epoll_wait is called again after consuming the wakeup 38 * event(s). 39 * 40 * Requires CAP_BLOCK_SUSPEND 41 */ 42 #define EPOLLWAKEUP (1 << 29) 43 44 /* Set the One Shot behaviour for the target file descriptor */ 45 #define EPOLLONESHOT (1 << 30) 46 47 /* Set the Edge Triggered behaviour for the target file descriptor */ 48 #define EPOLLET (1 << 31) 49 50 /* 51 * On x86-64 make the 64bit structure have the same alignment as the 52 * 32bit structure. This makes 32bit emulation easier. 53 * 54 * UML/x86_64 needs the same packing as x86_64 55 */ 56 #ifdef __x86_64__ 57 #define EPOLL_PACKED __attribute__((packed)) 58 #else 59 #define EPOLL_PACKED 60 #endif 61 62 struct epoll_event { 63 __u32 events; 64 __u64 data; 65 } EPOLL_PACKED; 66 67 #ifdef CONFIG_PM_SLEEP 68 static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) 69 { 70 if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND)) 71 epev->events &= ~EPOLLWAKEUP; 72 } 73 #else 74 static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) 75 { 76 epev->events &= ~EPOLLWAKEUP; 77 } 78 #endif 79 #endif /* _UAPI_LINUX_EVENTPOLL_H */ 80
