eventpoll.h (2911B) - Raw
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 _LINUX_EVENTPOLL_H 16 #define _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 (__poll_t)0x00000001 32 #define EPOLLPRI (__poll_t)0x00000002 33 #define EPOLLOUT (__poll_t)0x00000004 34 #define EPOLLERR (__poll_t)0x00000008 35 #define EPOLLHUP (__poll_t)0x00000010 36 #define EPOLLNVAL (__poll_t)0x00000020 37 #define EPOLLRDNORM (__poll_t)0x00000040 38 #define EPOLLRDBAND (__poll_t)0x00000080 39 #define EPOLLWRNORM (__poll_t)0x00000100 40 #define EPOLLWRBAND (__poll_t)0x00000200 41 #define EPOLLMSG (__poll_t)0x00000400 42 #define EPOLLRDHUP (__poll_t)0x00002000 43 44 /* 45 * Internal flag - wakeup generated by io_uring, used to detect recursion back 46 * into the io_uring poll handler. 47 */ 48 #define EPOLL_URING_WAKE ((__poll_t)(1U << 27)) 49 50 /* Set exclusive wakeup mode for the target file descriptor */ 51 #define EPOLLEXCLUSIVE ((__poll_t)(1U << 28)) 52 53 /* 54 * Request the handling of system wakeup events so as to prevent system suspends 55 * from happening while those events are being processed. 56 * 57 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be 58 * re-allowed until epoll_wait is called again after consuming the wakeup 59 * event(s). 60 * 61 * Requires CAP_BLOCK_SUSPEND 62 */ 63 #define EPOLLWAKEUP ((__poll_t)(1U << 29)) 64 65 /* Set the One Shot behaviour for the target file descriptor */ 66 #define EPOLLONESHOT ((__poll_t)(1U << 30)) 67 68 /* Set the Edge Triggered behaviour for the target file descriptor */ 69 #define EPOLLET ((__poll_t)(1U << 31)) 70 71 /* 72 * On x86-64 make the 64bit structure have the same alignment as the 73 * 32bit structure. This makes 32bit emulation easier. 74 * 75 * UML/x86_64 needs the same packing as x86_64 76 */ 77 #ifdef __x86_64__ 78 #define EPOLL_PACKED __attribute__((packed)) 79 #else 80 #define EPOLL_PACKED 81 #endif 82 83 struct epoll_event { 84 __poll_t events; 85 __u64 data; 86 } EPOLL_PACKED; 87 88 struct epoll_params { 89 __u32 busy_poll_usecs; 90 __u16 busy_poll_budget; 91 __u8 prefer_busy_poll; 92 93 /* pad the struct to a multiple of 64bits */ 94 __u8 __pad; 95 }; 96 97 #define EPOLL_IOC_TYPE 0x8A 98 #define EPIOCSPARAMS _IOW(EPOLL_IOC_TYPE, 0x01, struct epoll_params) 99 #define EPIOCGPARAMS _IOR(EPOLL_IOC_TYPE, 0x02, struct epoll_params) 100 101 #endif /* _LINUX_EVENTPOLL_H */