elf/ldd.sh.in

   1 #! /bin/sh
   2
   3 # This is the `ldd' command, which lists what shared libraries are
   4 # used by given dynamically-linked executables.  It works by invoking the
   5 # run-time dynamic linker as a command and setting the environment
   6 # variable LD_TRACE_LOADED_OBJECTS to a non-empty value.
   7
   8 RTLD=@RTLD@
   9 usage="\
  10 ldd [OPTION]... FILE...
  11   --help           print this help and exit
  12   --version        print version information and exit
  13 Report bugs to <bug-glibc@prep.ai.mit.edu>."
  14
  15 while test $# -gt 0; do
  16   case "$1" in
  17   --v*)
  18     echo 'ldd (GNU libc) @VERSION@'; exit 0 ;;
  19   --h*)
  20     echo "$usage"; exit 0 ;;
  21   --)           # Stop option prcessing
  22     shift; break ;;
  23   *)
  24     break ;;
  25   esac
  26 done
  27
  28 case $# in
  29 0)
  30   echo >&2 "\
  31 ldd: missing file arguments
  32 Try \`ldd --help' for more information."
  33   exit 1 ;;
  34 1)
  35   # We don't list the file name when there is only one.
  36   case "$1" in
  37   /*) file="$1" ;;
  38   *) file="./$1" ;;
  39   esac
  40   if test ! -f "$file"; then
  41     echo "${file}: no such file"
  42   elif ${RTLD} --verify "$file"; then
  43     LD_TRACE_LOADED_OBJECTS=1 exec ${RTLD} "$file" && exit 1
  44   else
  45     echo '      not a dynamic executable'
  46   fi
  47   exit ;;
  48 *)
  49   set -e        # Bail out immediately if ${RTLD} loses on any argument.
  50   for file; do
  51     echo "${file}:"
  52     case "$file" in
  53     /*) : ;;
  54     *) file="./$file" ;;
  55     esac
  56     if test ! -f "$file"; then
  57       echo "$file: no such file"
  58     elif ${RTLD} --verify "$file"; then
  59       LD_TRACE_LOADED_OBJECTS=1 ${RTLD} "$file"
  60     else
  61       echo '    not a dynamic executable'
  62     fi
  63   done
  64 esac
  65
  66 exit 0