dangle

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# Make sure ls properly handles dangling symlinks vs. ls's -L, -H, options.

if test "$VERBOSE" = yes; then
  set -x
  ls --version
fi

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
trap 'status=$?; cd $pwd; chmod -R u+rwx $t0; rm -rf $t0 && exit $status' 0
trap '(exit $?); exit $?' 1 2 13 15

framework_failure=0
mkdir -p $tmp || framework_failure=1
cd $tmp || framework_failure=1
ln -s no-such-file dangle || framework_failure=1
mkdir -p dir/sub || framework_failure=1
ln -s dir slink-to-dir || framework_failure=1

if test $framework_failure = 1; then
  echo "$0: failure in testing framework" 1>&2
  (exit 1); exit 1
fi

fail=0

# This must exit nonzero.
ls -L dangle > /dev/null 2>&1 && fail=1
# So must this.
ls -H dangle > /dev/null 2>&1 && fail=1

# This must exit successfully.
ls dangle >> out || fail=1

ls slink-to-dir >> out 2>&1 || fail=1
ls -H slink-to-dir >> out 2>&1 || fail=1
ls -L slink-to-dir >> out 2>&1 || fail=1

cat <<\EOF > exp
dangle
sub
sub
sub
EOF

cmp out exp || fail=1
test $fail = 1 && diff out exp 2> /dev/null

(exit $fail); exit $fail