glibc/elf/ldd.sh.in

#! /bin/sh

# Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
# This file is part of the GNU C Library.

# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.

# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Library General Public License for more details.

# You should have received a copy of the GNU Library General Public
# License along with the GNU C Library; see the file COPYING.LIB.  If not,
# write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.


# This is the `ldd' command, which lists what shared libraries are
# used by given dynamically-linked executables.  It works by invoking the
# run-time dynamic linker as a command and setting the environment
# variable LD_TRACE_LOADED_OBJECTS to a non-empty value.

RTLD=@RTLD@
warn=
bind_now=

while test $# -gt 0; do
  case "$1" in
  --vers | --versi | --versio | --version)
    echo 'ldd (GNU libc) @VERSION@
Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.'
    exit 0
    ;;
  --h | --he | --hel | --help)
    echo "ldd [OPTION]... FILE...
      --help              print this help and exit
      --version           print version information and exit
  -d, --data-relocs       process data relocations
  -r, --function-relocs   process data and function relocations
  -v, --verbose           print all information
Report bugs using the \`glibcbug' script to <bugs@gnu.org>."
    exit 0
    ;;
  -d | --d | --da | --dat | --data | --data- | --data-r | --data-re | \
  --data-rel | --data-relo | --data-reloc | --data-relocs)
    warn=yes
    shift
    ;;
  -r | --f | --fu | --fun | --func | --funct | --functi | --functio | \
  --function | --function- | --function-r | --function-re | --function-rel | \
  --function-relo | --function-reloc | --function-relocs)
    warn=yes
    bind_now=yes
    shift
    ;;
  -v | --verb | --verbo | --verbos | --verbose)
    verbose=yes
    shift
    ;;
  --v | --ve | --ver)
    echo >&2 "ldd: option \`$1' is ambiguous"
    exit 1
    ;;
  --)		# Stop option processing.
    shift; break
    ;;
  -*)
    echo >&2 "\
ldd: unrecognized option \`$1'
Try \`ldd --help' for more information."
    exit 1
    ;;
  *)
    break
    ;;
  esac
done

nonelf ()
{
  # Maybe extra code for non-ELF binaries.
  return 1;
}

add_env="LD_TRACE_LOADED_OBJECTS=1 LD_WARN=$warn LD_BIND_NOW=$bind_now"
add_env="$add_env LD_VERBOSE=$verbose"
case $# in
0)
  echo >&2 "\
ldd: missing file arguments
Try \`ldd --help' for more information."
  exit 1
  ;;
1)
  # We don't list the file name when there is only one.
  case "$1" in
  */*) file="$1"
       ;;
  *) file="./$1"
     ;;
  esac
  if test ! -f "$file"; then
    echo "ldd: ${file}: no such file"
    exit 1
  else
    if test -r "$file"; then
      test -x "$file" ||
	echo "ldd: warning: you do not have execution permission for \`$file'"
      verify_out=`${RTLD} --verify "$file"`
      case $? in
      0)
	eval $add_env exec '"$file"' || exit 1
	;;
      1)
        nonelf $file ||
	echo '	not a dynamic executable'
	exit 1
	;;
      2)
	eval $add_env exec \${RTLD} '"$file"' || exit 1
	;;
      *)
	echo "ldd: ${RTLD} exited with unknown exit code ($?)" >&2
	exit 1
	;;
      esac
    else
      echo "ldd: error: you do not have read permission for \`$file'"
      exit 1
    fi
  fi
  exit
  ;;
*)
  set -e	# Bail out immediately if ${RTLD} loses on any argument.
  result=0
  for file; do
    echo "${file}:"
    case "$file" in
    */*) :
         ;;
    *) file="./$file"
       ;;
    esac
    if test ! -f "$file"; then
      echo "ldd: ${file}: no such file"
      result=1
    else
      if test -r "$file"; then
	test -x "$file" || echo "\
ldd: warning: you do not have execution permission for \`$file'"
	verify_out=`${RTLD} --verify "$file"`
	case $? in
	0)
	  eval $add_env '"$file"' || result=1
	  ;;
	1)
          nonelf $file ||
	  echo '	not a dynamic executable'
	  result=1
	  ;;
	2)
	  eval $add_env ${RTLD} '"$file"' || result=1
	  ;;
	*)
	  echo "ldd: ${RTLD} exited with unknown exit code ($?)" >&2
	  exit 1
	  ;;
	esac
      else
	echo "ldd: error: you do not have read permission for \`$file'"
	result=1
      fi
    fi
  done
esac

exit $result