93 lines
3.1 KiB
Groff
93 lines
3.1 KiB
Groff
.\" A man page for gai.conf. -*- nroff -*-
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.\"
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.\" Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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.\"
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.\" This copyrighted material is made available to anyone wishing to use,
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.\" modify, copy, or redistribute it subject to the terms and conditions of the
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.\" GNU General Public License v.2.
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.\"
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.\" This program is distributed in the hope that it will be useful, but WITHOUT
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.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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.\" FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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.\" more details.
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.\"
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.\" You should have received a copy of the GNU General Public License along
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.\" with this program; if not, write to the Free Software Foundation, Inc.,
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.\" 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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.\"
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.\" Author: Ulrich Drepper <drepper@redhat.com>
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.TH gai.conf 5 "May 2006" gai.conf
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.SH NAME
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gai.conf \- getaddrinfo(3) configuration file
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.SH DESCRIPTION
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A call to
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.BR getaddrinfo (3)
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might return multiple answers. According to RFC 3484 these answers must
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be sorted so that the answer with the highest success rate is first in
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the list. The RFC provides and algorithm for the sorting. The static
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rules are not always adequate, though. For this reason the RFC also
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requires that system administrators get the chance to dynamically change
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the sorting. For the glibc implementation this can be achieved with
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the
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.BR /etc/gai.conf
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file.
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.PP
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Each line in the configuration file consists of a keyword and its
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parameters. White spaces in any place are ignored. Lines starting
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with `#' are comments and are ignored.
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.PP
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The keywords currently recognized are:
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.TP
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\fBlabel\fR \fInetmask\fR \fIprecedence\fR
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The value is added to the label table used in the RFC 3484 sorting.
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If any \fBlabel\fR definition is present in the configuration file
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is present the default table is not used. All the label definitions
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of the default table which are to be maintained have to be duplicated.
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Following the keyword the line has to contain a network mask and a label
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value.
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.TP
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\fBprecedence\fR \fInetmask\fR \fIprecedence\fR
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This keyword is similar to \fBlabel\fR but instead the value is added
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to the precendence table as specified in RFC 3484. Once again, the
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presence of a single \fBprecedence\fR line in the configuration file
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causes the default table to not be used.
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.TP
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\fBreload\fR <\fByes\fR|\fBno\fR>
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This keyword control whether a process checks whether the configuration
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file has been changes since the last time it was read. If the value is
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`\fByes\fR' the file is re-read. This might cause problems in multi-threaded
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applications and is generally a bad idea. The default is `\fBno\fR'.
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.SH EXAMPLE
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The default table according to RFC 3484 would be specified with the
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following configuration file:
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.nf
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label ::1/128 0
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label ::/0 1
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label 2002::/16 2
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label ::/96 3
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label ::ffff:0:0/96 4
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precendence ::1/128 50
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precendence ::/0 40
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precendence 2002::/16 30
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precendence ::/96 20
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precendence ::ffff:0:0/96 10
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.SH FILES
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\fI/etc/gai.conf\fR
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.SH AUTHOR
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Ulrich Drepper <drepper@redhat.com>
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.SH SEE ALSO
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.BR getaddrinfo(3),
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RFC 3484
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