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File: [cvs.NetBSD.org] / src / lib / libc / compat-43 / getdtablesize.3 (download)

Revision 1.14, Thu Jan 5 07:05:59 2012 UTC (6 years, 4 months ago) by yamt
Branch: MAIN
CVS Tags: yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-base, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-8-base, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-nb8-mediatek-base, matt-nb8-mediatek, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, localcount-20160914, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, agc-symver-base, agc-symver, HEAD
Changes since 1.13: +17 -9 lines

move the most of description to an appropriate section, HISTORY.

.\" Copyright (c) 1983, 1991, 1993
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.\"     from: @(#)getdtablesize.2	8.1 (Berkeley) 6/4/93
.\"	$NetBSD: getdtablesize.3,v 1.14 2012/01/05 07:05:59 yamt Exp $
.\"
.Dd January 5, 2012
.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
The
.Nm
function is an equivalent of
.Fn sysconf
with
.Dv _SC_OPEN_MAX .
.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 .
.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.