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OpenSolaris 2009.06 - man page for moe (opensolaris section 1)

moe(1)					  User Commands 				   moe(1)

       moe - manifest the optimal expansion of a pathname

       moe [-c] [-32 | -64] [-s | -v] path

       The  moe utility manifests the optimal expansion of a pathname containing reserved runtime
       linker tokens. These tokens can be used	to  define  dependencies,  filtees  and  runpaths
       within  dynamic	objects.  The  expansion  of these tokens at runtime, provides a flexible
       mechanism for selecting objects and search paths that perform best on  this  machine.  See

       For  example,  the token $HWCAP can be employed to represent filters and dependencies. The
       runtime interpretation of this token can result in a family of objects that  are  analyzed
       to  determine their applicability for loading with a process. The objects are sorted based
       on the hardware capabilities that each object requires to execute. moe returns the name of
       the object optimally suited for execution on the current platform.

       moe  analyzes  a  pathname  by passing the supplied path to dlmopen(3C), together with the
       RTLD_FIRST flag. Reserved token expansion is therefore  carried	out  by  ld.so.1  as  the
       expansion  would  occur in an executing process. Although multiple objects can be analyzed
       as a result of the dlmopen() call, the RTLD_FIRST flag insures only the optimal object  is

       By  default,  moe  analyzes  the specified path twice. The first analysis looks for 32-bit
       objects. The second analysis, if applicable, looks for 64-bit objects.  Typically,  32-bit
       objects	and  64-bit  objects are isolated to different directories. These directories are
       frequently named to reflect the class of  object  the  directory  contains.  The  multiple
       passes  of moe catch any instances where 32-bit objects and 64-bit objects occupy the same
       directory. Multiple passes also provide flexibility when the pathname  that  is	specified
       does not convey to the user the class of object the directory might contain.

       For  a  complete  description  of  the reserved token expansion carried out by the runtime
       linker, refer to the Linker and Libraries Guide.

       The following options are supported:

       -32    Only analyze 32-bit objects.

       -64    Only analyze 64-bit objects.

       -c     Prefix each pathname with the class of the object.

       -s     Silent. No optimal name, or error diagnostics are displayed. Only an  error  return
	      is made available. This option is only meaningful with the -32 and -64 options. The
	      -s option can not be used with the -v option.

       -v     Verbose. If no optimal expansion name can be determined,	an  error  diagnostic  is
	      written to standard error. The -v option can not be used with the -s option.

       The following operand is supported:

       path    The pathname to be expanded.

       The  following  example uses moe to display the optimal expansion of objects in the direc-
       tory /usr/lib/libc. This directory contains a family of Intel objects that  are	built  to
       use various hardware capabilities.

	 % moe '/usr/lib/libc/$HWCAP'

       The -c option can be used to clarify the class of the optimal object.

	 % moe -c '/usr/lib/libc/$HWCAP'
	 32-bit: /usr/lib/libc/libc_hwcap.so.1

       The  following  example	uses  moe  to  display the optimal expansion of objects under the
       /opt/ISV/cpu directory hierarchy. These directories contain a family of SPARC objects that
       are built for various platforms.

	 % moe -c -64 '/opt/ISV/$ISALIST/isa.so.1'
	 64-bit: /opt/ISV/sparcv9/isa.so.1

       The  -v	can  be  used  to diagnose the instance where an optimal name is not returned. An
       attempt to inspect the previous pathname as a 32-bit object, would result in the following
       diagnostic being produced.

	 % moe -c -v -32 '/opt/ISV/$ISALIST/isa.so.1'
	 32-bit: /opt/ISV/sparcv9/isa.so.1: wrong ELF class: ELFCLASS64

       When  the -32 or -64 options are in effect, a successful optimal expansion returns 0, oth-
       erwise non-zero. Without the -32 or -64 options in effect, the return value is always 0.

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Availability		     |SUNWcsu			   |
       |Interface Stability	     |Stable			   |

       ld.so.1(1), optisa(1), isalist(1), dlmopen(3C), attributes(5)

       Linker and Libraries Guide

SunOS 5.11				    2 Feb 2005					   moe(1)

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