mirror of https://github.com/mkerrisk/man-pages
78 lines
2.3 KiB
Groff
78 lines
2.3 KiB
Groff
.\"
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.\" epoll by Davide Libenzi ( efficient event notification retrieval )
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.\" Copyright (C) 2003 Davide Libenzi
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.\"
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.\" This program is free software; you can redistribute it and/or modify
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.\" it under the terms of the GNU General Public License as published by
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.\" the Free Software Foundation; either version 2 of the License, or
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.\" (at your option) any later version.
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.\"
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.\" This program 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
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public License
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.\" along with this program; if not, write to the Free Software
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.\" Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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.\"
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.\" Davide Libenzi <davidel@xmailserver.org>
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.\"
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.\" Modified 2004-06-17 by Michael Kerrisk <mtk-manpages@gmx.net>
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.\" Modified 2005-04-04 by Marko Kohtala <marko.kohtala@gmail.com>
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.\"
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.TH EPOLL_CREATE 2 "2004-06-17" "Linux 2.6.7" "Linux Programmer's Manual"
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.SH NAME
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epoll_create \- open an epoll file descriptor
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.SH SYNOPSIS
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.B #include <sys/epoll.h>
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.sp
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.BI "int epoll_create(int " size )
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.SH DESCRIPTION
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Open an
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.B epoll
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file descriptor by requesting the kernel allocate
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an event backing store dimensioned for
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.I size
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descriptors.
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The
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.I size
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is not the maximum size of the backing store but
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just a hint to the kernel about how to dimension internal structures.
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The returned file descriptor will be used for all the subsequent calls to the
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.B epoll
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interface.
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The file descriptor returned by
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.BR epoll_create (2)
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must be closed by using
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.BR close (2).
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.SH "RETURN VALUE"
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When successful,
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.BR epoll_create (2)
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returns a non-negative integer identifying the descriptor.
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When an error occurs,
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.BR epoll_create (2)
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returns \-1 and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EINVAL
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.I size
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is not positive.
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.TP
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.B ENFILE
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The system limit on the total number of open files has been reached.
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.TP
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.B ENOMEM
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There was insufficient memory to create the kernel object.
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.SH CONFORMING TO
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.BR epoll_create (2)
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is Linux specific, and was introduced in kernel 2.5.44.
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.\" The interface should be finalized by Linux kernel 2.5.66.
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.SH "SEE ALSO"
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.BR close (2),
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.BR epoll_ctl (2),
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.BR epoll_wait (2),
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.BR epoll (7)
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