| /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
| /* |
| * include/linux/eventpoll.h ( Efficient event polling implementation ) |
| * Copyright (C) 2001,...,2006 Davide Libenzi |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * Davide Libenzi <davidel@xmailserver.org> |
| * |
| */ |
| |
| #ifndef _UAPI_LINUX_EVENTPOLL_H |
| #define _UAPI_LINUX_EVENTPOLL_H |
| |
| /* For O_CLOEXEC */ |
| #include <linux/fcntl.h> |
| #include <linux/types.h> |
| |
| /* Flags for epoll_create1. */ |
| #define EPOLL_CLOEXEC O_CLOEXEC |
| |
| /* Valid opcodes to issue to sys_epoll_ctl() */ |
| #define EPOLL_CTL_ADD 1 |
| #define EPOLL_CTL_DEL 2 |
| #define EPOLL_CTL_MOD 3 |
| |
| /* Epoll event masks */ |
| #define EPOLLIN (__force __poll_t)0x00000001 |
| #define EPOLLPRI (__force __poll_t)0x00000002 |
| #define EPOLLOUT (__force __poll_t)0x00000004 |
| #define EPOLLERR (__force __poll_t)0x00000008 |
| #define EPOLLHUP (__force __poll_t)0x00000010 |
| #define EPOLLNVAL (__force __poll_t)0x00000020 |
| #define EPOLLRDNORM (__force __poll_t)0x00000040 |
| #define EPOLLRDBAND (__force __poll_t)0x00000080 |
| #define EPOLLWRNORM (__force __poll_t)0x00000100 |
| #define EPOLLWRBAND (__force __poll_t)0x00000200 |
| #define EPOLLMSG (__force __poll_t)0x00000400 |
| #define EPOLLRDHUP (__force __poll_t)0x00002000 |
| |
| /* |
| * Internal flag - wakeup generated by io_uring, used to detect recursion back |
| * into the io_uring poll handler. |
| */ |
| #define EPOLL_URING_WAKE ((__force __poll_t)(1U << 27)) |
| |
| /* Set exclusive wakeup mode for the target file descriptor */ |
| #define EPOLLEXCLUSIVE ((__force __poll_t)(1U << 28)) |
| |
| /* |
| * Request the handling of system wakeup events so as to prevent system suspends |
| * from happening while those events are being processed. |
| * |
| * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be |
| * re-allowed until epoll_wait is called again after consuming the wakeup |
| * event(s). |
| * |
| * Requires CAP_BLOCK_SUSPEND |
| */ |
| #define EPOLLWAKEUP ((__force __poll_t)(1U << 29)) |
| |
| /* Set the One Shot behaviour for the target file descriptor */ |
| #define EPOLLONESHOT ((__force __poll_t)(1U << 30)) |
| |
| /* Set the Edge Triggered behaviour for the target file descriptor */ |
| #define EPOLLET ((__force __poll_t)(1U << 31)) |
| |
| /* |
| * On x86-64 make the 64bit structure have the same alignment as the |
| * 32bit structure. This makes 32bit emulation easier. |
| * |
| * UML/x86_64 needs the same packing as x86_64 |
| */ |
| #ifdef __x86_64__ |
| #define EPOLL_PACKED __attribute__((packed)) |
| #else |
| #define EPOLL_PACKED |
| #endif |
| |
| struct epoll_event { |
| __poll_t events; |
| __u64 data; |
| } EPOLL_PACKED; |
| |
| #ifdef CONFIG_PM_SLEEP |
| static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) |
| { |
| if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND)) |
| epev->events &= ~EPOLLWAKEUP; |
| } |
| #else |
| static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) |
| { |
| epev->events &= ~EPOLLWAKEUP; |
| } |
| #endif |
| #endif /* _UAPI_LINUX_EVENTPOLL_H */ |