b89737395b
Linux Programmer's Manual
NAME
epoll_create, epoll_create1 - open an epoll file descriptor
...
SYNOPSIS
#include <sys/epoll.h>
int epoll_create1(int flags);
...
epoll_create1()
If flags is 0, then, other than the fact that the obsolete
size argument is dropped, epoll_create1() is the same as
epoll_create(). The following value can be included in flags
to obtain different behavior:
EPOLL_CLOEXEC
Set the close-on-exec (FD_CLOEXEC) flag on the new file
descriptor. See the description of the O_CLOEXEC flag in
open(2) for reasons why this may be useful.
https://man7.org/linux/man-pages/man7/epoll.7.html
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/****************************************************************************
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* fs/vfs/fs_epoll.c
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*
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* Copyright (C) 2015 Anton D. Kachalov. All rights reserved.
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* Author: Anton D. Kachalov <mouse@mayc.ru>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_SYS_EPOLL_H
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#define __INCLUDE_SYS_EPOLL_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <poll.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define EPOLL_CTL_ADD 1 /* Add a file descriptor to the interface. */
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#define EPOLL_CTL_DEL 2 /* Remove a file descriptor from the interface. */
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#define EPOLL_CTL_MOD 3 /* Change file descriptor epoll_event structure. */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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enum EPOLL_EVENTS
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{
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EPOLLIN = POLLIN,
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#define EPOLLIN EPOLLIN
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EPOLLPRI = POLLPRI,
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#define EPOLLPRI EPOLLPRI
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EPOLLOUT = POLLOUT,
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#define EPOLLOUT EPOLLOUT
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EPOLLRDNORM = POLLRDNORM,
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#define EPOLLRDNORM EPOLLRDNORM
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EPOLLRDBAND = POLLRDBAND,
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#define EPOLLRDBAND EPOLLRDBAND
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EPOLLWRNORM = POLLWRNORM,
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#define EPOLLWRNORM EPOLLWRNORM
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EPOLLWRBAND = POLLWRBAND,
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#define EPOLLWRBAND EPOLLWRBAND
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EPOLLERR = POLLERR,
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#define EPOLLERR EPOLLERR
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EPOLLHUP = POLLHUP,
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#define EPOLLHUP EPOLLHUP
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};
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/* Flags to be passed to epoll_create1. */
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enum
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{
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EPOLL_CLOEXEC = 02000000
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#define EPOLL_CLOEXEC EPOLL_CLOEXEC
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};
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typedef union poll_data
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{
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void *ptr;
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int fd;
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uint32_t u32;
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} epoll_data_t;
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struct epoll_event
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{
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epoll_data_t data;
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pollevent_t events; /* The input event flags */
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pollevent_t revents; /* The output event flags */
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/* Non-standard fields used internally by NuttX. */
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void *reserved; /* reserved feild sync with struct pollfd */
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FAR sem_t *sem; /* Pointer to semaphore used to post output event */
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FAR void *priv; /* For use by drivers */
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};
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struct epoll_head
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{
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int size;
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int occupied;
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FAR struct epoll_event *evs;
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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int epoll_create(int size);
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int epoll_create1(int flags);
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int epoll_ctl(int epfd, int op, int fd, struct epoll_event *ev);
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int epoll_wait(int epfd, struct epoll_event *evs,
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int maxevents, int timeout);
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void epoll_close(int epfd);
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#endif /* __INCLUDE_SYS_EPOLL_H */
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