elf/ldd.bash.in

   1 #! @BASH@
   2 # Copyright (C) 1996-2008, 2009, 2010, 2011 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 " "2011"
  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 "
  56     echo $"For bug reporting instructions, please see:
  57 <http://www.gnu.org/software/libc/bugs.html>.
  58 "
  59     exit 0
  60     ;;
  61   -d | --d | --da | --dat | --data | --data- | --data-r | --data-re | \
  62   --data-rel | --data-relo | --data-reloc | --data-relocs)
  63     warn=yes
  64     shift
  65     ;;
  66   -r | --f | --fu | --fun | --func | --funct | --functi | --functio | \
  67   --function | --function- | --function-r | --function-re | --function-rel | \
  68   --function-relo | --function-reloc | --function-relocs)
  69     warn=yes
  70     bind_now=yes
  71     shift
  72     ;;
  73   -v | --verb | --verbo | --verbos | --verbose)
  74     verbose=yes
  75     shift
  76     ;;
  77   -u | --u | --un | --unu | --unus | --unuse | --unused)
  78     unused=yes
  79     shift
  80     ;;
  81   --v | --ve | --ver)
  82     echo >&2 $"ldd: option \`$1' is ambiguous"
  83     exit 1
  84     ;;
  85   --)           # Stop option processing.
  86     shift; break
  87     ;;
  88   -*)
  89     echo >&2 'ldd:' $"unrecognized option" "\`$1'"
  90     echo >&2 $"Try \`ldd --help' for more information."
  91     exit 1
  92     ;;
  93   *)
  94     break
  95     ;;
  96   esac
  97 done
  98
  99 nonelf ()
 100 {
 101   # Maybe extra code for non-ELF binaries.
 102   return 1;
 103 }
 104
 105 add_env="LD_TRACE_LOADED_OBJECTS=1 LD_WARN=$warn LD_BIND_NOW=$bind_now"
 106 add_env="$add_env LD_VERBOSE=$verbose"
 107 if test "$unused" = yes; then
 108   add_env="$add_env LD_DEBUG=\"$LD_DEBUG${LD_DEBUG:+,}unused\""
 109 fi
 110
 111 # The following use of cat is needed to make ldd work in SELinux
 112 # environments where the executed program might not have permissions
 113 # to write to the console/tty.  But only bash 3.x supports the pipefail
 114 # option, and we don't bother to handle the case for older bash versions.
 115 if set -o pipefail 2> /dev/null; then
 116   try_trace() {
 117     eval $add_env '"$@"' | cat
 118   }
 119 else
 120   try_trace() {
 121     eval $add_env '"$@"'
 122   }
 123 fi
 124
 125 case $# in
 126 0)
 127   echo >&2 'ldd:' $"missing file arguments"
 128   echo >&2 $"Try \`ldd --help' for more information."
 129   exit 1
 130   ;;
 131 1)
 132   single_file=t
 133   ;;
 134 *)
 135   single_file=f
 136   ;;
 137 esac
 138
 139 result=0
 140 for file do
 141   # We don't list the file name when there is only one.
 142   test $single_file = t || echo "${file}:"
 143   case $file in
 144   */*) :
 145        ;;
 146   *) file=./$file
 147      ;;
 148   esac
 149   if test ! -e "$file"; then
 150     echo "ldd: ${file}:" $"No such file or directory" >&2
 151     result=1
 152   elif test ! -f "$file"; then
 153     echo "ldd: ${file}:" $"not regular file" >&2
 154     result=1
 155   elif test -r "$file"; then
 156     test -x "$file" || echo 'ldd:' $"\
 157 warning: you do not have execution permission for" "\`$file'" >&2
 158     RTLD=
 159     ret=1
 160     for rtld in ${RTLDLIST}; do
 161       if test -x $rtld; then
 162         verify_out=`${rtld} --verify "$file"`
 163         ret=$?
 164         case $ret in
 165         [02]) RTLD=${rtld}; break;;
 166         esac
 167       fi
 168     done
 169     case $ret in
 170     0)
 171       # If the program exits with exit code 5, it means the process has been
 172       # invoked with __libc_enable_secure.  Fall back to running it through
 173       # the dynamic linker.
 174       try_trace "$file"
 175       rc=$?
 176       if [ $rc = 5 ]; then
 177         try_trace "$RTLD" "$file"
 178         rc=$?
 179       fi
 180       [ $rc = 0 ] || result=1
 181       ;;
 182     1)
 183       # This can be a non-ELF binary or no binary at all.
 184       nonelf "$file" || {
 185         echo $" not a dynamic executable"
 186         result=1
 187       }
 188       ;;
 189     2)
 190       try_trace "$RTLD" "$file" || result=1
 191       ;;
 192     *)
 193       echo 'ldd:' ${RTLD} $"exited with unknown exit code" "($ret)" >&2
 194       exit 1
 195       ;;
 196     esac
 197   else
 198     echo 'ldd:' $"error: you do not have read permission for" "\`$file'" >&2
 199     result=1
 200   fi
 201 done
 202
 203 exit $result
 204 # Local Variables:
 205 #  mode:ksh
 206 # End: