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Editing: ldd

#!/usr/bin/bash
# Copyright (C) 1996-2021 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 Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 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
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <https://www.gnu.org/licenses/>.

# 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.

# We should be able to find the translation right at the beginning.
TEXTDOMAIN=libc
TEXTDOMAINDIR=/usr/share/locale

RTLDLIST="/lib/ld-linux.so.2 /lib64/ld-linux-x86-64.so.2 /libx32/ld-linux-x32.so.2"
warn=
bind_now=
verbose=

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="$add_env LD_LIBRARY_VERSION=\$verify_out"
add_env="$add_env LD_VERBOSE=$verbose"
if test "$unused" = yes; then
  add_env="$add_env LD_DEBUG=\"$LD_DEBUG${LD_DEBUG:+,}unused\""
fi

# The following command substitution is needed to make ldd work in SELinux
# environments where the RTLD might not have permission to write to the
# terminal.  The extra "x" character prevents the shell from trimming trailing
# newlines from command substitution results.  This function is defined as a
# subshell compound list (using "(...)") to prevent parameter assignments from
# affecting the calling shell execution environment.
try_trace() (
  output=$(eval $add_env '"$@"' 2>&1; rc=$?; printf 'x'; exit $rc)
  rc=$?
  printf '%s' "${output%x}"
  return $rc
)

case $# in
0)
  echo >&2 'ldd:' $"missing file arguments"
  echo >&2 $"Try \`ldd --help' for more information."
  exit 1
  ;;
1)
  single_file=t
  ;;
*)
  single_file=f
  ;;
esac

result=0
for file do
  # We don't list the file name when there is only one.
  test $single_file = t || echo "${file}:"
  case $file in
  */*) :
       ;;
  *) file=./$file
     ;;
  esac
  if test ! -e "$file"; then
    echo "ldd: ${file}:" $"No such file or directory" >&2
    result=1
  elif test ! -f "$file"; then
    echo "ldd: ${file}:" $"not regular file" >&2
    result=1
  elif test -r "$file"; then
    test -x "$file" || echo 'ldd:' $"\
warning: you do not have execution permission for" "\`$file'" >&2
    RTLD=
    ret=1
    for rtld in ${RTLDLIST}; do
      if test -x $rtld; then
	verify_out=`${rtld} --verify "$file"`
	ret=$?
	case $ret in
	[02]) RTLD=${rtld}; break;;
	esac
      fi
    done
    case $ret in
    1)
      # This can be a non-ELF binary or no binary at all.
      nonelf "$file" || {
	echo $"	not a dynamic executable" >&2
	result=1
      }
      ;;
    0|2)
      try_trace "$RTLD" "$file" || result=1
      ;;
    *)
      echo 'ldd:' ${RTLD} $"exited with unknown exit code" "($ret)" >&2
      exit 1
      ;;
    esac
  else
    echo 'ldd:' $"error: you do not have read permission for" "\`$file'" >&2
    result=1
  fi
done

exit $result
# Local Variables:
#  mode:ksh
# End:

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