elf/ldd.bash.in

   1 #! @BASH@
   2 # Copyright (C) 1996-2011, 2012 Free Software Foundation, Inc.
   3 # This file is part of the GNU C Library.
   4
   5 # The GNU C Library is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU Lesser General Public
   7 # License as published by the Free Software Foundation; either
   8 # version 2.1 of the License, or (at your option) any later version.
   9
  10 # The GNU C Library is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # Lesser General Public License for more details.
  14
  15 # You should have received a copy of the GNU Lesser General Public
  16 # License along with the GNU C Library; if not, see
  17 # <http://www.gnu.org/licenses/>.
  18
  19
  20 # This is the `ldd' command, which lists what shared libraries are
  21 # used by given dynamically-linked executables.  It works by invoking the
  22 # run-time dynamic linker as a command and setting the environment
  23 # variable LD_TRACE_LOADED_OBJECTS to a non-empty value.
  24
  25 # We should be able to find the translation right at the beginning.
  26 TEXTDOMAIN=libc
  27 TEXTDOMAINDIR=@TEXTDOMAINDIR@
  28
  29 RTLDLIST=@RTLD@
  30 warn=
  31 bind_now=
  32 verbose=
  33
  34 while test $# -gt 0; do
  35   case "$1" in
  36   --vers | --versi | --versio | --version)
  37     echo 'ldd (GNU libc) @VERSION@'
  38     printf $"Copyright (C) %s Free Software Foundation, Inc.
  39 This is free software; see the source for copying conditions.  There is NO
  40 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  41 " "2012"
  42     printf $"Written by %s and %s.
  43 " "Roland McGrath" "Ulrich Drepper"
  44     exit 0
  45     ;;
  46   --h | --he | --hel | --help)
  47     echo $"Usage: ldd [OPTION]... FILE...
  48       --help              print this help and exit
  49       --version           print version information and exit
  50   -d, --data-relocs       process data relocations
  51   -r, --function-relocs   process data and function relocations
  52   -u, --unused            print unused direct dependencies
  53   -v, --verbose           print all information
  54 "
  55     echo $"For bug reporting instructions, please see:
  56 <http://www.gnu.org/software/libc/bugs.html>.
  57 "
  58     exit 0
  59     ;;
  60   -d | --d | --da | --dat | --data | --data- | --data-r | --data-re | \
  61   --data-rel | --data-relo | --data-reloc | --data-relocs)
  62     warn=yes
  63     shift
  64     ;;
  65   -r | --f | --fu | --fun | --func | --funct | --functi | --functio | \
  66   --function | --function- | --function-r | --function-re | --function-rel | \
  67   --function-relo | --function-reloc | --function-relocs)
  68     warn=yes
  69     bind_now=yes
  70     shift
  71     ;;
  72   -v | --verb | --verbo | --verbos | --verbose)
  73     verbose=yes
  74     shift
  75     ;;
  76   -u | --u | --un | --unu | --unus | --unuse | --unused)
  77     unused=yes
  78     shift
  79     ;;
  80   --v | --ve | --ver)
  81     echo >&2 $"ldd: option \`$1' is ambiguous"
  82     exit 1
  83     ;;
  84   --)           # Stop option processing.
  85     shift; break
  86     ;;
  87   -*)
  88     echo >&2 'ldd:' $"unrecognized option" "\`$1'"
  89     echo >&2 $"Try \`ldd --help' for more information."
  90     exit 1
  91     ;;
  92   *)
  93     break
  94     ;;
  95   esac
  96 done
  97
  98 nonelf ()
  99 {
 100   # Maybe extra code for non-ELF binaries.
 101   return 1;
 102 }
 103
 104 add_env="LD_TRACE_LOADED_OBJECTS=1 LD_WARN=$warn LD_BIND_NOW=$bind_now"
 105 add_env="$add_env LD_VERBOSE=$verbose"
 106 if test "$unused" = yes; then
 107   add_env="$add_env LD_DEBUG=\"$LD_DEBUG${LD_DEBUG:+,}unused\""
 108 fi
 109
 110 # The following use of cat is needed to make ldd work in SELinux
 111 # environments where the executed program might not have permissions
 112 # to write to the console/tty.  But only bash 3.x supports the pipefail
 113 # option, and we don't bother to handle the case for older bash versions.
 114 if set -o pipefail 2> /dev/null; then
 115   try_trace() {
 116     eval $add_env '"$@"' | cat
 117   }
 118 else
 119   try_trace() {
 120     eval $add_env '"$@"'
 121   }
 122 fi
 123
 124 case $# in
 125 0)
 126   echo >&2 'ldd:' $"missing file arguments"
 127   echo >&2 $"Try \`ldd --help' for more information."
 128   exit 1
 129   ;;
 130 1)
 131   single_file=t
 132   ;;
 133 *)
 134   single_file=f
 135   ;;
 136 esac
 137
 138 result=0
 139 for file do
 140   # We don't list the file name when there is only one.
 141   test $single_file = t || echo "${file}:"
 142   case $file in
 143   */*) :
 144        ;;
 145   *) file=./$file
 146      ;;
 147   esac
 148   if test ! -e "$file"; then
 149     echo "ldd: ${file}:" $"No such file or directory" >&2
 150     result=1
 151   elif test ! -f "$file"; then
 152     echo "ldd: ${file}:" $"not regular file" >&2
 153     result=1
 154   elif test -r "$file"; then
 155     test -x "$file" || echo 'ldd:' $"\
 156 warning: you do not have execution permission for" "\`$file'" >&2
 157     RTLD=
 158     ret=1
 159     for rtld in ${RTLDLIST}; do
 160       if test -x $rtld; then
 161         verify_out=`${rtld} --verify "$file"`
 162         ret=$?
 163         case $ret in
 164         [02]) RTLD=${rtld}; break;;
 165         esac
 166       fi
 167     done
 168     case $ret in
 169     0)
 170       # If the program exits with exit code 5, it means the process has been
 171       # invoked with __libc_enable_secure.  Fall back to running it through
 172       # the dynamic linker.
 173       try_trace "$file"
 174       rc=$?
 175       if [ $rc = 5 ]; then
 176         try_trace "$RTLD" "$file"
 177         rc=$?
 178       fi
 179       [ $rc = 0 ] || result=1
 180       ;;
 181     1)
 182       # This can be a non-ELF binary or no binary at all.
 183       nonelf "$file" || {
 184         echo $" not a dynamic executable"
 185         result=1
 186       }
 187       ;;
 188     2)
 189       try_trace "$RTLD" "$file" || result=1
 190       ;;
 191     *)
 192       echo 'ldd:' ${RTLD} $"exited with unknown exit code" "($ret)" >&2
 193       exit 1
 194       ;;
 195     esac
 196   else
 197     echo 'ldd:' $"error: you do not have read permission for" "\`$file'" >&2
 198     result=1
 199   fi
 200 done
 201
 202 exit $result
 203 # Local Variables:
 204 #  mode:ksh
 205 # End: