2011-02-14 20:36:03 +01:00
|
|
|
.\" Copyright (c) 1983, 1991, 1993
|
|
|
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
|
|
|
.\" may be used to endorse or promote products derived from this software
|
|
|
|
|
.\" without specific prior written permission.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
|
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
|
.\" SUCH DAMAGE.
|
|
|
|
|
.\"
|
|
|
|
|
.\" from: @(#)getdtablesize.2 8.1 (Berkeley) 6/4/93
|
2012-11-15 12:06:41 +01:00
|
|
|
.\" $NetBSD: getdtablesize.3,v 1.14 2012/01/05 07:05:59 yamt Exp $
|
2011-02-14 20:36:03 +01:00
|
|
|
.\"
|
2012-11-15 12:06:41 +01:00
|
|
|
.Dd January 5, 2012
|
2011-02-14 20:36:03 +01:00
|
|
|
.Dt GETDTABLESIZE 3
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm getdtablesize
|
|
|
|
|
.Nd get descriptor table size
|
|
|
|
|
.Sh LIBRARY
|
|
|
|
|
.Lb libc
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In unistd.h
|
|
|
|
|
.Ft int
|
|
|
|
|
.Fn getdtablesize void
|
|
|
|
|
.Sh DESCRIPTION
|
2012-11-15 12:06:41 +01:00
|
|
|
The
|
|
|
|
|
.Nm
|
|
|
|
|
function is an equivalent of
|
|
|
|
|
.Fn sysconf
|
|
|
|
|
with
|
|
|
|
|
.Dv _SC_OPEN_MAX .
|
2011-02-14 20:36:03 +01:00
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr close 2 ,
|
|
|
|
|
.Xr dup 2 ,
|
|
|
|
|
.Xr getrlimit 2 ,
|
|
|
|
|
.Xr open 2 ,
|
|
|
|
|
.Xr select 2 ,
|
|
|
|
|
.Xr sysconf 3
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
The
|
|
|
|
|
.Fn getdtablesize
|
|
|
|
|
function call appeared in
|
|
|
|
|
.Bx 4.2 .
|
2012-11-15 12:06:41 +01:00
|
|
|
.Pp
|
|
|
|
|
Historically, each process had a fixed size descriptor table,
|
|
|
|
|
which is guaranteed to have at least 20 slots.
|
|
|
|
|
The entries in
|
|
|
|
|
the descriptor table are numbered with small integers starting at 0.
|
|
|
|
|
The call
|
|
|
|
|
.Fn getdtablesize
|
|
|
|
|
used to return the size of this table.
|
|
|
|
|
It doesn't make much sense these days because the size of the table is dynamic.
|
