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linux_man_pages_library

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project.
a description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.
.so man3/slist.3
.so man3/lround.3
.so man3/nextup.3
.\" copyright (c) 2003 davide libenzi
.\" and copyright 2008, 2009, 2012 michael kerrisk <[email protected]>
.\" davide libenzi <[email protected]>
.\"
.\" %%%license_start(gplv2+_sw_3_para)
.\" 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.
.\"
.\" this program is distributed in the hope that it will be useful,
.\" but without any warranty; without even the implied warranty of
.\" merchantability or fitness for a particular purpose. see the
.\" gnu general public license for more details.
.\"
.\" you should have received a copy of the gnu general public
.\" license along with this manual; if not, see
.\" <http://www.gnu.org/licenses/>.
.\" %%%license_end
.\"
.\" modified 2004-06-17 by michael kerrisk <[email protected]>
.\" modified 2005-04-04 by marko kohtala <[email protected]>
.\" 2008-10-10, mtk: add description of epoll_create1()
.\"
.th epoll_create 2 2021-03-22 "linux" "linux programmer's manual"
.sh name
epoll_create, epoll_create1 \- open an epoll file descriptor
.sh synopsis
.nf
.b #include <sys/epoll.h>
.pp
.bi "int epoll_create(int " size );
.bi "int epoll_create1(int " flags );
.fi
.sh description
.br epoll_create ()
creates a new
.br epoll (7)
instance.
since linux 2.6.8, the
.i size
argument is ignored, but must be greater than zero; see notes.
.pp
.br epoll_create ()
returns a file descriptor referring to the new epoll instance.
this file descriptor is used for all the subsequent calls to the
.b epoll
interface.
when no longer required, the file descriptor returned by
.br epoll_create ()
should be closed by using
.br close (2).
when all file descriptors referring to an epoll instance have been closed,
the kernel destroys the instance
and releases the associated resources for reuse.
.ss epoll_create1()
if
.i flags
is 0, then, other than the fact that the obsolete
.i size
argument is dropped,
.br epoll_create1 ()
is the same as
.br epoll_create ().
the following value can be included in
.ir flags
to obtain different behavior:
.tp
.b epoll_cloexec
set the close-on-exec
.rb ( fd_cloexec )
flag on the new file descriptor.
see the description of the
.b o_cloexec
flag in
.br open (2)
for reasons why this may be useful.
.sh return value
on success,
these system calls
return a file descriptor (a nonnegative integer).
on error, \-1 is returned, and
.i errno
is set to indicate the error.
.sh errors
.tp
.b einval