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Edit File : eventpoll.h \| Size : 2.67 KB
/* 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 */ Back

Edit File : eventpoll.h | Size : 2.67 KB

/* 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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