/* Copyright (C) 2002-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _SYS_EPOLL_H

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#define _SYS_EPOLL_H 1

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#include <stdint.h>

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#include <sys/types.h>

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#include <bits/types/sigset_t.h>

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/* Get the platform-dependent flags. */

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#include <bits/epoll.h>

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#ifndef __EPOLL_PACKED

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# define __EPOLL_PACKED

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#endif

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enum EPOLL_EVENTS

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{

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EPOLLIN = 0x001,

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#define EPOLLIN EPOLLIN

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EPOLLPRI = 0x002,

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#define EPOLLPRI EPOLLPRI

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EPOLLOUT = 0x004,

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#define EPOLLOUT EPOLLOUT

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EPOLLRDNORM = 0x040,

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#define EPOLLRDNORM EPOLLRDNORM

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EPOLLRDBAND = 0x080,

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#define EPOLLRDBAND EPOLLRDBAND

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EPOLLWRNORM = 0x100,

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#define EPOLLWRNORM EPOLLWRNORM

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EPOLLWRBAND = 0x200,

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#define EPOLLWRBAND EPOLLWRBAND

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EPOLLMSG = 0x400,

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#define EPOLLMSG EPOLLMSG

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EPOLLERR = 0x008,

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#define EPOLLERR EPOLLERR

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EPOLLHUP = 0x010,

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#define EPOLLHUP EPOLLHUP

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EPOLLRDHUP = 0x2000,

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#define EPOLLRDHUP EPOLLRDHUP

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EPOLLEXCLUSIVE = 1u << 28,

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#define EPOLLEXCLUSIVE EPOLLEXCLUSIVE

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EPOLLWAKEUP = 1u << 29,

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#define EPOLLWAKEUP EPOLLWAKEUP

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EPOLLONESHOT = 1u << 30,

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#define EPOLLONESHOT EPOLLONESHOT

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EPOLLET = 1u << 31

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#define EPOLLET EPOLLET

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};

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/* Valid opcodes ( "op" parameter ) to issue to epoll_ctl(). */

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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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typedef union epoll_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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uint64_t u64;

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} epoll_data_t;

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struct epoll_event

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{

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uint32_t events; /* Epoll events */

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epoll_data_t data; /* User data variable */

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} __EPOLL_PACKED;

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__BEGIN_DECLS

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/* Creates an epoll instance. Returns an fd for the new instance.

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The "size" parameter is a hint specifying the number of file

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descriptors to be associated with the new instance. The fd

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returned by epoll_create() should be closed with close(). */

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extern int epoll_create (int __size) __THROW;

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/* Same as epoll_create but with an FLAGS parameter. The unused SIZE

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parameter has been dropped. */

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extern int epoll_create1 (int __flags) __THROW;

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/* Manipulate an epoll instance "epfd". Returns 0 in case of success,

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-1 in case of error ( the "errno" variable will contain the

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specific error code ) The "op" parameter is one of the EPOLL_CTL_*

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constants defined above. The "fd" parameter is the target of the

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operation. The "event" parameter describes which events the caller

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is interested in and any associated user data. */

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extern int epoll_ctl (int __epfd, int __op, int __fd,

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struct epoll_event *__event) __THROW;

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/* Wait for events on an epoll instance "epfd". Returns the number of

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triggered events returned in "events" buffer. Or -1 in case of

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error with the "errno" variable set to the specific error code. The

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"events" parameter is a buffer that will contain triggered

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events. The "maxevents" is the maximum number of events to be

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returned ( usually size of "events" ). The "timeout" parameter

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specifies the maximum wait time in milliseconds (-1 == infinite).

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern int epoll_wait (int __epfd, struct epoll_event *__events,

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int __maxevents, int __timeout);

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/* Same as epoll_wait, but the thread's signal mask is temporarily

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and atomically replaced with the one provided as parameter.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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extern int epoll_pwait (int __epfd, struct epoll_event *__events,

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int __maxevents, int __timeout,

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const __sigset_t *__ss);

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__END_DECLS

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#endif /* sys/epoll.h */

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