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ldd5.3 KB · 193 lines
#!/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=libcTEXTDOMAINDIR=/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= while test $# -gt 0; do  case "$1" in  --vers | --versi | --versio | --version)    echo 'ldd (GNU libc) 2.34'    printf $"Copyright (C) %s Free Software Foundation, Inc.This is free software; see the source for copying conditions.  There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." "2021"    printf $"Written by %s and %s." "Roland McGrath" "Ulrich Drepper"    exit 0    ;;  --h | --he | --hel | --help)    echo $"Usage: 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  -u, --unused            print unused direct dependencies  -v, --verbose           print all information"    printf $"For bug reporting instructions, please see:\\n%s.\\n" \      "<https://www.gnu.org/software/libc/bugs.html>"    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    ;;  -u | --u | --un | --unu | --unus | --unuse | --unused)    unused=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'"    echo >&2 $"Try \`ldd --help' for more information."    exit 1    ;;  *)    break    ;;  esacdone nonelf (){  # Maybe extra code for non-ELF binaries.  return 1;} add_env="LD_TRACE_LOADED_OBJECTS=1 LD_WARN=$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 $# in0)  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=0for 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  fidone exit $result# Local Variables:#  mode:ksh# End: