diff options
Diffstat (limited to 'tests/tail-2')
-rwxr-xr-x | tests/tail-2/big-4gb | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/tests/tail-2/big-4gb b/tests/tail-2/big-4gb new file mode 100755 index 000000000..4cb9d7dbc --- /dev/null +++ b/tests/tail-2/big-4gb @@ -0,0 +1,45 @@ +#!/bin/sh +# Demonstrate a bug in `tail -cN' when operating on files of size 4G and larger +# Fixed in coreutils-4.5.2. + +if test "$VERBOSE" = yes; then + set -x + tail --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 + +# Create a file of size exactly 4GB (2^32) with 8 bytes +# at the beginning and another set of 8 bytes at the end. +# The rest will be NUL bytes. On most modern systems, the following +# creates a file that takes up only a few KB. Here, du -sh says 16KB. +echo abcdefgh | tr -d '\n' > big +echo 87654321 | tr -d '\n' > tmp +# Seek 4GB - 8 +dd bs=1 seek=4294967288 if=tmp of=big + +if test $framework_failure = 1; then + echo '$0: failure in testing framework' 1>&2 + (exit 1); exit 1 +fi + +fail=0 + +tail -c1 big > out || fail=1 +# Append a newline. +echo >> out +cat <<\EOF > exp +1 +EOF + +cmp out exp || fail=1 +test $fail = 1 && diff out exp 2> /dev/null + +(exit $fail); exit $fail |