The C and C++ Include Header Files

/usr/include/linux/eventpoll.h


$ cat -n /usr/include/linux/eventpoll.h

     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 _LINUX_EVENTPOLL_H
    16	#define _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		(__poll_t)0x00000001
    32	#define EPOLLPRI	(__poll_t)0x00000002
    33	#define EPOLLOUT	(__poll_t)0x00000004
    34	#define EPOLLERR	(__poll_t)0x00000008
    35	#define EPOLLHUP	(__poll_t)0x00000010
    36	#define EPOLLNVAL	(__poll_t)0x00000020
    37	#define EPOLLRDNORM	(__poll_t)0x00000040
    38	#define EPOLLRDBAND	(__poll_t)0x00000080
    39	#define EPOLLWRNORM	(__poll_t)0x00000100
    40	#define EPOLLWRBAND	(__poll_t)0x00000200
    41	#define EPOLLMSG	(__poll_t)0x00000400
    42	#define EPOLLRDHUP	(__poll_t)0x00002000
    43	
    44	/*
    45	 * Internal flag - wakeup generated by io_uring, used to detect recursion back
    46	 * into the io_uring poll handler.
    47	 */
    48	#define EPOLL_URING_WAKE	((__poll_t)(1U << 27))
    49	
    50	/* Set exclusive wakeup mode for the target file descriptor */
    51	#define EPOLLEXCLUSIVE	((__poll_t)(1U << 28))
    52	
    53	/*
    54	 * Request the handling of system wakeup events so as to prevent system suspends
    55	 * from happening while those events are being processed.
    56	 *
    57	 * Assuming neither EPOLLET nor EPOLLONESHOT is set, system suspends will not be
    58	 * re-allowed until epoll_wait is called again after consuming the wakeup
    59	 * event(s).
    60	 *
    61	 * Requires CAP_BLOCK_SUSPEND
    62	 */
    63	#define EPOLLWAKEUP	((__poll_t)(1U << 29))
    64	
    65	/* Set the One Shot behaviour for the target file descriptor */
    66	#define EPOLLONESHOT	((__poll_t)(1U << 30))
    67	
    68	/* Set the Edge Triggered behaviour for the target file descriptor */
    69	#define EPOLLET		((__poll_t)(1U << 31))
    70	
    71	/* 
    72	 * On x86-64 make the 64bit structure have the same alignment as the
    73	 * 32bit structure. This makes 32bit emulation easier.
    74	 *
    75	 * UML/x86_64 needs the same packing as x86_64
    76	 */
    77	#ifdef __x86_64__
    78	#define EPOLL_PACKED __attribute__((packed))
    79	#else
    80	#define EPOLL_PACKED
    81	#endif
    82	
    83	struct epoll_event {
    84		__poll_t events;
    85		__u64 data;
    86	} EPOLL_PACKED;
    87	
    88	#endif /* _LINUX_EVENTPOLL_H */