DragonFly On-Line Manual Pages
LIBMAP.CONF(5) DragonFly File Formats Manual LIBMAP.CONF(5)
libmap.conf -- configuration file for dynamic object dependency mapping
The libmap functionality of ld-elf.so.2(1) allows dynamic object
dependencies to be mapped to arbitrary names.
Each line in /etc/libmap.conf can have one of five forms:
Whenever a dependency on origin is encountered while loading a
dynamic object, use target instead of searching for origin in the
normal library search paths.
When iterating through a library search path, replace any element
that matches path1 exactly with path2.
Apply constraint to all subsequent mappings until the next
constraint line or the end of the file. See the Constraints
section for details.
Parse the contents of file before continuing with the current
file. Nesting depth is limited only by available memory, but
each file encountered is processed only once, and loops are
Recurse through dir and parse the contents of any file that ends
in .conf before continuing with the current file. Nesting depth
is limited only by available memory, but each directory or file
encountered is processed only once, and loops are silently
Constrained mappings only apply when processing binaries or libraries
that satisfy the constraint. There are three types of constraints:
Exact The constraint is matched literally so that only an executable
with an identical fully qualified pathname will satisfy the
constraint. This means that the executable /usr/bin/foo will not
satisfy the constraint [/usr/bin/./foo], and vice-versa. This is
the default constraint type.
A constraint with no path is matched against the basename of the
executable. For instance, the constraint [foo] will match
/bin/foo, /usr/local/sbin/foo, or any other executable named foo,
no matter what directory it is in.
A constraint with a trailing slash is satisfied if the full
pathname begins with the constraint string. For instance, the
constraint [/usr/bin/] will match any executable with a path
starting with /usr/bin/.
Note that the constraints are matched against the path that was passed as
the first argument to whichever exec(3) function was used to execute the
binary in question. Most programs executed from a shell are run without
a full path, via execvp(3) or similar, so the basename constraint type is
the most useful.
WARNING! Constraints apply to all mappings until the next constraint or
the end of the file. Hence, unconstrained mappings must be placed at the
top of the file.
/etc/libmap.conf The libmap configuration file.
# candidate target
libc_r.so.6 libpthread.so.2 # Everything that uses 'libc_r'
libc_r.so libpthread.so # now uses 'libpthread'
[/tmp/mplayer] # Test version of mplayer uses libc_r
[/usr/local/jdk1.4.1/] # All Java 1.4.1 programs use libthr
# This works because "javavms" executes
# programs with the full pathname
# Glue for Linux-only EPSON printer .so to be loaded into cups, etc.
The libmap mechanism first appeared in FreeBSD 5.1.
This manual page was written by Matthew N. Dodd <email@example.com> and
extensively rewritten by
Dag-Erling Smorgrav <des@FreeBSD.org>.
DragonFly 5.5 September 16, 2013 DragonFly 5.5