f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
71 lines
2.5 KiB
Groff
71 lines
2.5 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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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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.\" 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 the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be 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 REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)getdtablesize.2 8.1 (Berkeley) 6/4/93
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.\" $NetBSD: getdtablesize.3,v 1.14 2012/01/05 07:05:59 yamt Exp $
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.\"
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.Dd January 5, 2012
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.Dt GETDTABLESIZE 3
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.Os
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.Sh NAME
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.Nm getdtablesize
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.Nd get descriptor table size
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn getdtablesize void
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.Sh DESCRIPTION
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The
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.Nm
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function is an equivalent of
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.Fn sysconf
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with
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.Dv _SC_OPEN_MAX .
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.Sh SEE ALSO
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.Xr close 2 ,
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.Xr dup 2 ,
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.Xr getrlimit 2 ,
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.Xr open 2 ,
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.Xr select 2 ,
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.Xr sysconf 3
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.Sh HISTORY
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The
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.Fn getdtablesize
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function call appeared in
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.Bx 4.2 .
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.Pp
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Historically, each process had a fixed size descriptor table,
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which is guaranteed to have at least 20 slots.
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The entries in
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the descriptor table are numbered with small integers starting at 0.
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The call
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.Fn getdtablesize
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used to return the size of this table.
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It doesn't make much sense these days because the size of the table is dynamic.
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