elf/ldd.bash.in

   1 #! @BASH@
   2 # Copyright (C) 1996-2001, 2002, 2003, 2004 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 " "2004"
  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 case $# in
 109 0)
 110   echo >&2 'ldd:' $"missing file arguments"
 111   echo >&2 $"Try \`ldd --help' for more information."
 112   exit 1
 113   ;;
 114 1)
 115   single_file=t
 116   ;;
 117 *)
 118   single_file=f
 119   ;;
 120 esac
 121
 122 result=0
 123 for file do
 124   # We don't list the file name when there is only one.
 125   test $single_file = t || echo "${file}:"
 126   case $file in
 127   */*) :
 128        ;;
 129   *) file=./$file
 130      ;;
 131   esac
 132   if test ! -f "$file"; then
 133     echo "ldd: ${file}:" $"No such file or directory" >&2
 134     result=1
 135   elif test -r "$file"; then
 136     test -x "$file" || echo 'ldd:' $"\
 137 warning: you do not have execution permission for" "\`$file'" >&2
 138     RTLD=
 139     for rtld in ${RTLDLIST}; do
 140       if test -x $rtld; then
 141         verify_out=`${rtld} --verify "$file"`
 142         ret=$?
 143         case $ret in
 144         [02]) RTLD=${rtld}; break;;
 145         esac
 146       fi
 147     done
 148     if test -z "${RTLD}"; then
 149       set ${RTLDLIST}
 150       RTLD=$1
 151       verify_out=`${RTLD} --verify "$file"`
 152       ret=$?
 153     fi
 154     case $ret in
 155     0)
 156       eval $add_env '"$file"' || result=1
 157       ;;
 158     1)
 159       # This can be a non-ELF binary or no binary at all.
 160       nonelf "$file" || {
 161         echo $" not a dynamic executable"
 162         result=1
 163       }
 164       ;;
 165     2)
 166       # The following use of cat is needed to make ldd work in SELinux
 167       # environments where the executed program might not have permissions
 168       # to write to the console/tty.
 169       eval $add_env \${RTLD} '"$file"' | cat || result=1
 170       ;;
 171     *)
 172       echo 'ldd:' ${RTLD} $"exited with unknown exit code" "($ret)" >&2
 173       exit 1
 174       ;;
 175     esac
 176   else
 177     echo 'ldd:' $"error: you do not have read permission for" "\`$file'" >&2
 178     result=1
 179   fi
 180 done
 181
 182 exit $result
 183 # Local Variables:
 184 #  mode:ksh
 185 # End: