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eventpoll.h
/* 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 _LINUX_EVENTPOLL_H #define _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 (__poll_t)0x00000001 #define EPOLLPRI (__poll_t)0x00000002 #define EPOLLOUT (__poll_t)0x00000004 #define EPOLLERR (__poll_t)0x00000008 #define EPOLLHUP (__poll_t)0x00000010 #define EPOLLNVAL (__poll_t)0x00000020 #define EPOLLRDNORM (__poll_t)0x00000040 #define EPOLLRDBAND (__poll_t)0x00000080 #define EPOLLWRNORM (__poll_t)0x00000100 #define EPOLLWRBAND (__poll_t)0x00000200 #define EPOLLMSG (__poll_t)0x00000400 #define EPOLLRDHUP (__poll_t)0x00002000 /* Set exclusive wakeup mode for the target file descriptor */ #define EPOLLEXCLUSIVE (__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 (__poll_t)(1U << 29) /* Set the One Shot behaviour for the target file descriptor */ #define EPOLLONESHOT (__poll_t)(1U << 30) /* Set the Edge Triggered behaviour for the target file descriptor */ #define EPOLLET (__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 /* _LINUX_EVENTPOLL_H */
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