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