elf/ldd.bash.in

   1 #! @BASH@
   2 # Copyright (C) 1996-2008, 2009 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, write to the Free
  17 # Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18 # 02111-1307 USA.
  19
  20
  21 # This is the `ldd' command, which lists what shared libraries are
  22 # used by given dynamically-linked executables.  It works by invoking the
  23 # run-time dynamic linker as a command and setting the environment
  24 # variable LD_TRACE_LOADED_OBJECTS to a non-empty value.
  25
  26 # We should be able to find the translation right at the beginning.
  27 TEXTDOMAIN=libc
  28 TEXTDOMAINDIR=@TEXTDOMAINDIR@
  29
  30 RTLDLIST=@RTLD@
  31 warn=
  32 bind_now=
  33 verbose=
  34
  35 while test $# -gt 0; do
  36   case "$1" in
  37   --vers | --versi | --versio | --version)
  38     echo 'ldd (GNU libc) @VERSION@'
  39     printf $"Copyright (C) %s Free Software Foundation, Inc.
  40 This is free software; see the source for copying conditions.  There is NO
  41 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  42 " "2009"
  43     printf $"Written by %s and %s.
  44 " "Roland McGrath" "Ulrich Drepper"
  45     exit 0
  46     ;;
  47   --h | --he | --hel | --help)
  48     echo $"Usage: ldd [OPTION]... FILE...
  49       --help              print this help and exit
  50       --version           print version information and exit
  51   -d, --data-relocs       process data relocations
  52   -r, --function-relocs   process data and function relocations
  53   -u, --unused            print unused direct dependencies
  54   -v, --verbose           print all information
  55 For bug reporting instructions, please see:
  56 <http://www.gnu.org/software/libc/bugs.html>."
  57     exit 0
  58     ;;
  59   -d | --d | --da | --dat | --data | --data- | --data-r | --data-re | \
  60   --data-rel | --data-relo | --data-reloc | --data-relocs)
  61     warn=yes
  62     shift
  63     ;;
  64   -r | --f | --fu | --fun | --func | --funct | --functi | --functio | \
  65   --function | --function- | --function-r | --function-re | --function-rel | \
  66   --function-relo | --function-reloc | --function-relocs)
  67     warn=yes
  68     bind_now=yes
  69     shift
  70     ;;
  71   -v | --verb | --verbo | --verbos | --verbose)
  72     verbose=yes
  73     shift
  74     ;;
  75   -u | --u | --un | --unu | --unus | --unuse | --unused)
  76     unused=yes
  77     shift
  78     ;;
  79   --v | --ve | --ver)
  80     echo >&2 $"ldd: option \`$1' is ambiguous"
  81     exit 1
  82     ;;
  83   --)           # Stop option processing.
  84     shift; break
  85     ;;
  86   -*)
  87     echo >&2 'ldd:' $"unrecognized option" "\`$1'"
  88     echo >&2 $"Try \`ldd --help' for more information."
  89     exit 1
  90     ;;
  91   *)
  92     break
  93     ;;
  94   esac
  95 done
  96
  97 nonelf ()
  98 {
  99   # Maybe extra code for non-ELF binaries.
 100   return 1;
 101 }
 102
 103 add_env="LD_TRACE_LOADED_OBJECTS=1 LD_WARN=$warn LD_BIND_NOW=$bind_now"
 104 add_env="$add_env LD_VERBOSE=$verbose"
 105 if test "$unused" = yes; then
 106   add_env="$add_env LD_DEBUG=\"$LD_DEBUG${LD_DEBUG:+,}unused\""
 107 fi
 108
 109 # The following use of cat is needed to make ldd work in SELinux
 110 # environments where the executed program might not have permissions
 111 # to write to the console/tty.  But only bash 3.x supports the pipefail
 112 # option, and we don't bother to handle the case for older bash versions.
 113 if set -o pipefail 2> /dev/null; then
 114   try_trace() {
 115     eval $add_env '"$@"' | cat
 116   }
 117 else
 118   try_trace() {
 119     eval $add_env '"$@"'
 120   }
 121 fi
 122
 123 case $# in
 124 0)
 125   echo >&2 'ldd:' $"missing file arguments"
 126   echo >&2 $"Try \`ldd --help' for more information."
 127   exit 1
 128   ;;
 129 1)
 130   single_file=t
 131   ;;
 132 *)
 133   single_file=f
 134   ;;
 135 esac
 136
 137 result=0
 138 for file do
 139   # We don't list the file name when there is only one.
 140   test $single_file = t || echo "${file}:"
 141   case $file in
 142   */*) :
 143        ;;
 144   *) file=./$file
 145      ;;
 146   esac
 147   if test ! -e "$file"; then
 148     echo "ldd: ${file}:" $"No such file or directory" >&2
 149     result=1
 150   elif test ! -f "$file"; then
 151     echo "ldd: ${file}:" $"not regular file" >&2
 152     result=1
 153   elif test -r "$file"; then
 154     test -x "$file" || echo 'ldd:' $"\
 155 warning: you do not have execution permission for" "\`$file'" >&2
 156     RTLD=
 157     ret=1
 158     for rtld in ${RTLDLIST}; do
 159       if test -x $rtld; then
 160         verify_out=`${rtld} --verify "$file"`
 161         ret=$?
 162         case $ret in
 163         [02]) RTLD=${rtld}; break;;
 164         esac
 165       fi
 166     done
 167     case $ret in
 168     0)
 169       # If the program exits with exit code 5, it means the process has been
 170       # invoked with __libc_enable_secure.  Fall back to running it through
 171       # the dynamic linker.
 172       try_trace "$file"
 173       rc=$?
 174       if [ $rc = 5 ]; then
 175         try_trace "$RTLD" "$file"
 176         rc=$?
 177       fi
 178       [ $rc = 0 ] || result=1
 179       ;;
 180     1)
 181       # This can be a non-ELF binary or no binary at all.
 182       nonelf "$file" || {
 183         echo $" not a dynamic executable"
 184         result=1
 185       }
 186       ;;
 187     2)
 188       try_trace "$RTLD" "$file" || result=1
 189       ;;
 190     *)
 191       echo 'ldd:' ${RTLD} $"exited with unknown exit code" "($ret)" >&2
 192       exit 1
 193       ;;
 194     esac
 195   else
 196     echo 'ldd:' $"error: you do not have read permission for" "\`$file'" >&2
 197     result=1
 198   fi
 199 done
 200
 201 exit $result
 202 # Local Variables:
 203 #  mode:ksh
 204 # End: