cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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eventpoll.h (2878B)

      1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
      2/*
      3 *  include/linux/eventpoll.h ( Efficient event polling implementation )
      4 *  Copyright (C) 2001,...,2006	 Davide Libenzi
      5 *
      6 *  This program is free software; you can redistribute it and/or modify
      7 *  it under the terms of the GNU General Public License as published by
      8 *  the Free Software Foundation; either version 2 of the License, or
      9 *  (at your option) any later version.
     10 *
     11 *  Davide Libenzi <davidel@xmailserver.org>
     12 *
     13 */
     14
     15#ifndef _UAPI_LINUX_EVENTPOLL_H
     16#define _UAPI_LINUX_EVENTPOLL_H
     17
     18/* For O_CLOEXEC */
     19#include <linux/fcntl.h>
     20#include <linux/types.h>
     21
     22/* Flags for epoll_create1.  */
     23#define EPOLL_CLOEXEC O_CLOEXEC
     24
     25/* Valid opcodes to issue to sys_epoll_ctl() */
     26#define EPOLL_CTL_ADD 1
     27#define EPOLL_CTL_DEL 2
     28#define EPOLL_CTL_MOD 3
     29
     30/* Epoll event masks */
     31#define EPOLLIN		(__force __poll_t)0x00000001
     32#define EPOLLPRI	(__force __poll_t)0x00000002
     33#define EPOLLOUT	(__force __poll_t)0x00000004
     34#define EPOLLERR	(__force __poll_t)0x00000008
     35#define EPOLLHUP	(__force __poll_t)0x00000010
     36#define EPOLLNVAL	(__force __poll_t)0x00000020
     37#define EPOLLRDNORM	(__force __poll_t)0x00000040
     38#define EPOLLRDBAND	(__force __poll_t)0x00000080
     39#define EPOLLWRNORM	(__force __poll_t)0x00000100
     40#define EPOLLWRBAND	(__force __poll_t)0x00000200
     41#define EPOLLMSG	(__force __poll_t)0x00000400
     42#define EPOLLRDHUP	(__force __poll_t)0x00002000
     43
     44/* Set exclusive wakeup mode for the target file descriptor */
     45#define EPOLLEXCLUSIVE	((__force __poll_t)(1U << 28))
     46
     47/*
     48 * Request the handling of system wakeup events so as to prevent system suspends
     49 * from happening while those events are being processed.
     50 *
     51 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be
     52 * re-allowed until epoll_wait is called again after consuming the wakeup
     53 * event(s).
     54 *
     55 * Requires CAP_BLOCK_SUSPEND
     56 */
     57#define EPOLLWAKEUP	((__force __poll_t)(1U << 29))
     58
     59/* Set the One Shot behaviour for the target file descriptor */
     60#define EPOLLONESHOT	((__force __poll_t)(1U << 30))
     61
     62/* Set the Edge Triggered behaviour for the target file descriptor */
     63#define EPOLLET		((__force __poll_t)(1U << 31))
     64
     65/* 
     66 * On x86-64 make the 64bit structure have the same alignment as the
     67 * 32bit structure. This makes 32bit emulation easier.
     68 *
     69 * UML/x86_64 needs the same packing as x86_64
     70 */
     71#ifdef __x86_64__
     72#define EPOLL_PACKED __attribute__((packed))
     73#else
     74#define EPOLL_PACKED
     75#endif
     76
     77struct epoll_event {
     78	__poll_t events;
     79	__u64 data;
     80} EPOLL_PACKED;
     81
     82#ifdef CONFIG_PM_SLEEP
     83static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
     84{
     85	if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
     86		epev->events &= ~EPOLLWAKEUP;
     87}
     88#else
     89static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
     90{
     91	epev->events &= ~EPOLLWAKEUP;
     92}
     93#endif
     94#endif /* _UAPI_LINUX_EVENTPOLL_H */