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 <[email protected]> 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 /* 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 42 /* Set exclusive wakeup mode for the target file descriptor */ 43 #define EPOLLEXCLUSIVE (1U << 28) 44 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 */ 55 #define EPOLLWAKEUP (1U << 29) 56 57 /* Set the One Shot behaviour for the target file descriptor */ 58 #define EPOLLONESHOT (1U << 30) 59 60 /* Set the Edge Triggered behaviour for the target file descriptor */ 61 #define EPOLLET (1U << 31) 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 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 92 #endif /* _UAPI_LINUX_EVENTPOLL_H */ 93