cregit-Linux how code gets into the kernel

Release 4.7 include/uapi/linux/eventpoll.h

/*
 *  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

/* Set exclusive wakeup mode for the target file descriptor */

#define EPOLLEXCLUSIVE (1 << 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 (1 << 29)

/* Set the One Shot behaviour for the target file descriptor */

#define EPOLLONESHOT (1 << 30)

/* Set the Edge Triggered behaviour for the target file descriptor */

#define EPOLLET (1 << 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 {
	
__u32 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; }

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#else
static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev) { epev->events &= ~EPOLLWAKEUP; }

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#endif #endif /* _UAPI_LINUX_EVENTPOLL_H */

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david howellsdavid howells7753.85%133.33%
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jason baronjason baron53.50%133.33%
Total143100.00%3100.00%
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