125 lines
3.5 KiB
Groff
125 lines
3.5 KiB
Groff
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.\" $NetBSD: ldd.1,v 1.18 2009/09/07 20:06:21 wiz Exp $
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.\"
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.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Paul Kranenburg.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 7, 2009
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.Dt LDD 1
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.Os
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.Sh NAME
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.Nm ldd
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.Nd list dynamic object dependencies
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.Sh SYNOPSIS
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.Nm
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.Op Fl o
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.Op Fl f Ar format
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.Ar program ...
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.Sh DESCRIPTION
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.Nm
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displays all shared objects that are needed to run the given program.
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Contrary to
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.Xr nm 1 ,
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the list includes
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.Dq indirect
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dependencies that are the result of needed shared objects which themselves
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depend on yet other shared objects.
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Zero, one or two
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.Fl f
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options may be given.
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The argument is a format string passed to
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.Xr rtld 1
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and allows customization of
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.Nm ldd Ns 's
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output.
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The first format argument is used for library objects and defaults to
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.Qq "\et-l%o.%m =\*[Gt] %p\en" .
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The second format argument is used for non-library objects and defaults to
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.Qq "\et%o =\*[Gt] %p\en" .
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.Pp
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These arguments are interpreted as format strings a la
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.Xr printf 3
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to customize the trace output and allow
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.Nm
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to be operated as a filter more conveniently.
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The following conversions can be used:
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.Bl -tag -width xxxx
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.It \&%a
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The main program's name
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.Po also known as
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.Dq __progname
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.Pc .
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.It \&%A
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The value of the environment variable
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.Ev LD_TRACE_LOADED_OBJECTS_PROGNAME
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in a.out and the program name from the argument vector from elf.
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.It \&%o
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The library name.
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.It \&%m
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The library's major version number.
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.It \&%n
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The library's minor version number (a.out only, ignored in elf).
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.It \&%p
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The full pathname as determined by
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.Nm rtld Ns 's
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library search rules.
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.It \&%x
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The library's load address
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.El
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.Pp
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Additionally,
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.Sy \en
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and
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.Sy \et
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are recognized and have their usual meaning.
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.Pp
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The
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.Fl o
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option is an alias for
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.Fl f
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.Ar \&%a:-l\&%o.\&%m =\*[Gt] \&%p\en ,
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which makes
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.Nm
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behave analogously to
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.Ic nm Fl o .
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.Sh SEE ALSO
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.Xr ld 1 ,
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.Xr ld.elf_so 1 ,
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.Xr nm 1 ,
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.Xr rtld 1
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.Sh HISTORY
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A
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.Nm
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utility first appeared in SunOS 4.0, it appeared in its current form
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in
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.Nx 0.9a .
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.Sh BUGS
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The
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a.out
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.Nm
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actually runs the program it has been requested to analyze which in specially
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constructed environments can have security implications.
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