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LIBMAP.CONF(5)            FreeBSD File Formats Manual           LIBMAP.CONF(5)

     libmap.conf - configuration file for dynamic object dependency mapping

     The libmap functionality of allows dynamic object
     dependencies to be mapped to arbitrary names.

     The configuration file consists of two whitespace separated columns; the
     left hand side containing the mapping candidate and the right hand side
     containing the mapping.  Dependencies are matched against candidates and
     replaced with the mappings.

     Constrained mappings may be specified by enclosing the name of the
     executable or library in brackets.  All mappings following a constraint
     will only be evaluated for that constraint.  Constraints can be one of
     three types:

     Exact   The constraint is matched literally so that only an executable
             with an identical fully qualified pathname will match the
             constraint.  This means that the executable /usr/bin/foo will not
             match a constraint for /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.  foo will match /bin/foo, /usr/local/sbin/foo, or any
             other executable named foo, no matter what its path is.

             A constraint with a trailing slash is prefix-matched against the
             full pathname of the executable.  /usr/bin/ will match any
             executable with a path starting with /usr/bin.

     Note that the executable path matched against is the path parameter in an
     exec*() function call.  The Directory or Exact constraints can only match
     when the executable is called with a full pathname.  Most programs
     executed from a shell are run without a full path, via exec*p(), so the
     Basename constraint type is the most useful.

     WARNING!  Constrained mappings must never appear first in the
     configuration file.  While there is a way to specify the ``default''
     constraint, its use is not recommended.

     The most common use at the date of writing is for allowing multiple POSIX
     threading libraries to be used on a system without relinking or changing

     # /etc/libmap.conf
     # candidate             mapping
     # # Everything uses 'libpthread'     # Everything that uses 'libc_r'        # now uses 'libpthread'

     [/tmp/mplayer]          # Test version of mplayer uses libc_r 

     [mplayer]               # All other mplayers use libpthread 

     [/usr/local/jdk1.4.1/]  # All Java 1.4.1 programs use libthr
                             # This works because "javavms" executes
                             # programs with the full pathname 

     /etc/libmap.conf      The libmap configuration file.

     ldd(1), rtld(1)

     The libmap.conf manual page and libmap functionality first appeared in
     FreeBSD 5.1.

     This manual page was written by Matthew N. Dodd <>.

FreeBSD 11.0-PRERELEASE        January 31, 2004        FreeBSD 11.0-PRERELEASE


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