1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ 2 /* 3 * include/linux/eventpoll.h ( Efficient event polling implementation ) 4 * Copyright (C) 2001,...,2006 Davide Libenzi 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * Davide Libenzi <davidel@xmailserver.org> 12 * 13 */ 14 15 #ifndef _UAPI_LINUX_EVENTPOLL_H 16 #define _UAPI_LINUX_EVENTPOLL_H 17 18 /* For O_CLOEXEC */ 19 #include <linux/fcntl.h> 20 #include <linux/types.h> 21 22 /* Flags for epoll_create1. */ 23 #define EPOLL_CLOEXEC O_CLOEXEC 24 25 /* Valid opcodes to issue to sys_epoll_ctl() */ 26 #define EPOLL_CTL_ADD 1 27 #define EPOLL_CTL_DEL 2 28 #define EPOLL_CTL_MOD 3 29 30 /* Epoll event masks */ 31 #define EPOLLIN 0x00000001 32 #define EPOLLPRI 0x00000002 33 #define EPOLLOUT 0x00000004 34 #define EPOLLERR 0x00000008 35 #define EPOLLHUP 0x00000010 36 #define EPOLLRDNORM 0x00000040 37 #define EPOLLRDBAND 0x00000080 38 #define EPOLLWRNORM 0x00000100 39 #define EPOLLWRBAND 0x00000200 40 #define EPOLLMSG 0x00000400 41 #define EPOLLRDHUP 0x00002000 42 43 /* Set exclusive wakeup mode for the target file descriptor */ 44 #define EPOLLEXCLUSIVE (1U << 28) 45 46 /* 47 * Request the handling of system wakeup events so as to prevent system suspends 48 * from happening while those events are being processed. 49 * 50 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be 51 * re-allowed until epoll_wait is called again after consuming the wakeup 52 * event(s). 53 * 54 * Requires CAP_BLOCK_SUSPEND 55 */ 56 #define EPOLLWAKEUP (1U << 29) 57 58 /* Set the One Shot behaviour for the target file descriptor */ 59 #define EPOLLONESHOT (1U << 30) 60 61 /* Set the Edge Triggered behaviour for the target file descriptor */ 62 #define EPOLLET (1U << 31) 63 64 /* 65 * On x86-64 make the 64bit structure have the same alignment as the 66 * 32bit structure. This makes 32bit emulation easier. 67 * 68 * UML/x86_64 needs the same packing as x86_64 69 */ 70 #ifdef __x86_64__ 71 #define EPOLL_PACKED __attribute__((packed)) 72 #else 73 #define EPOLL_PACKED 74 #endif 75 76 struct epoll_event { 77 __u32 events; 78 __u64 data; 79 } EPOLL_PACKED; 80 81 #ifdef CONFIG_PM_SLEEP ep_take_care_of_epollwakeup(struct epoll_event * epev)82static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) 83 { 84 if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND)) 85 epev->events &= ~EPOLLWAKEUP; 86 } 87 #else ep_take_care_of_epollwakeup(struct epoll_event * epev)88static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) 89 { 90 epev->events &= ~EPOLLWAKEUP; 91 } 92 #endif 93 #endif /* _UAPI_LINUX_EVENTPOLL_H */ 94