29ade36225
This is an optional feature, disabled by default. This will be useful to people testing the various POSIX threading libraries under -CURRENT but can easily serve other needs.
112 lines
3.6 KiB
Groff
112 lines
3.6 KiB
Groff
.\" Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net>
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.\" Note: The date here should be updated whenever a non-trivial
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.\" change is made to the manual page.
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.Dd April 7, 2003
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.Dt LIBMAP.CONF 5
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.Os
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.Sh NAME
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.Nm libmap.conf
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.Nd "configuration file for dynamic object dependency mapping"
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.Sh DESCRIPTION
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The
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.Em libmap
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functionality of
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.Nm ld-elf.so.1
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allows dynamic object dependencies to be mapped to arbitrary
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names.
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.Pp
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The configuration file consists of two whitespace separated columns; the
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left hand side containing the mapping candidate and the right hand
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side containing the mapping. Dependencies are matched against candidates
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and replaced with the mappings.
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.Pp
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Constrained mappings may be specified by enclosing the name of the
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executable or library in brackets. All mappings following a constraint
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will only be evaluated for that constraint. Currently, constraints
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are matched literally so that an executable with a fully qualified pathname
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will only match the same constraint. This means that
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.Em /usr/bin/foo
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will not match a constraint for
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.Em foo
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and vise-versa.
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.Pp
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WARNING! Constrained mappings must never appear first in the configuration
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file. While there is a way to specify the
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.Dq default
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constraint, its use is not recommended.
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.Pp
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The most common use at the date of writing is for allowing multiple
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POSIX threading libraries to be used on a system without relinking or
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changing symlinks.
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.Pp
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In order to enable this feature please see
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.Pa src/libexec/rtld-elf/Makefile .
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.Sh EXAMPLE
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.Bd -literal
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# /etc/libmap.conf
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#
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# candidate mapping
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#
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libc_r.so.5 libthr.so.1 # Everything uses 'libthr'
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libc_r.so libthr.so
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[/usr/local/bin/mplayer] # 'mplayer' uses libc_r.
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libc_r.so.5 libc_r.so.5
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libc_r.so libc_r.so
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[mplayer]
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libc_r.so.5 libc_r.so.5
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libc_r.so libc_r.so
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[/usr/local/sbin/httpd] # Apache uses libkse
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libc_r.so.5 libkse.so.1
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libc_r.so libkse.so
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[httpd]
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libc_r.so.5 libkse.so.1
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libc_r.so libkse.so
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.Ed
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.Sh FILES
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.Bl -tag -width ".Pa /etc/libmap.conf" -compact
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.It Pa /etc/libmap.conf
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The libmap configuration file.
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.El
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.Sh SEE ALSO
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.Xr rtld 1
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.Xr ldd 1
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.Sh HISTORY
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The
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.Nm
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manual page and libmap.conf functionality first appeared in
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.Fx 5.1 .
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.Sh AUTHORS
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This
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manual page was written by
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.An Matthew N. Dodd <winter@jurai.net> .
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