glibc/elf/ldd.sh.in

#! /bin/sh

# This is the `ldd' command, which lists what shared libraries are
# used by given dynamically-linked executables.  It works by invoking the
# run-time dynamic linker as a command and setting the environment
# variable LD_TRACE_LOADED_OBJECTS to a non-empty value.

RTLD=@RTLD@
usage="\
ldd [OPTION]... FILE...
  --help           print this help and exit
  --version        print version information and exit
Report bugs to <bug-glibc@prep.ai.mit.edu>."

while test $# -gt 0; do
  case "$1" in
  --v*)
    echo 'ldd (GNU libc) @VERSION@'; exit 0 ;;
  --h*)
    echo "$usage"; exit 0 ;;
  --)		# Stop option prcessing
    shift; break ;;
  *)
    break ;;
  esac
done

case $# in
0)
  echo >&2 "\
ldd: missing file arguments
Try \`ldd --help' for more information."
  exit 1 ;;
1)
  # We don't list the file name when there is only one.
  case "$1" in
  /*) file="$1" ;;
  *) file="./$1" ;;
  esac
  if test ! -f "$file"; then
    echo "${file}: no such file"
  elif ${RTLD} --verify "$file"; then
    LD_TRACE_LOADED_OBJECTS=1 exec ${RTLD} "$file" && exit 1
  else
    echo '	not a dynamic executable'
  fi
  exit ;;
*)
  set -e	# Bail out immediately if ${RTLD} loses on any argument.
  for file; do
    echo "${file}:"
    case "$file" in
    /*) : ;;
    *) file="./$file" ;;
    esac
    if test ! -f "$file"; then
      echo "$file: no such file"
    elif ${RTLD} --verify "$file"; then
      LD_TRACE_LOADED_OBJECTS=1 ${RTLD} "$file"
    else
      echo '	not a dynamic executable'
    fi
  done
esac

exit 0