diff options
Diffstat (limited to 'tests/tail-2/big-4gb')
| -rwxr-xr-x | tests/tail-2/big-4gb | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/tests/tail-2/big-4gb b/tests/tail-2/big-4gb new file mode 100755 index 0000000..b0ca79d --- /dev/null +++ b/tests/tail-2/big-4gb @@ -0,0 +1,71 @@ +#!/bin/sh +# Demonstrate a bug in `tail -cN' when operating on files of size 4G and larger +# Fixed in coreutils-4.5.2. + +# Copyright (C) 2002, 2003, 2006 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +# 02110-1301, USA. + +. $srcdir/../expensive + +if test "$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 $tmp || framework_failure=1 + +# Create a file of size exactly 4GB (2^32) with 8 bytes +# at the beginning and another set of 8 bytes at the end. +# The rest will be NUL bytes. On most modern systems, the following +# creates a file that takes up only a few KB. Here, du -sh says 16K. +echo abcdefgh | tr -d '\n' > big || framework_failure=1 +echo 87654321 | tr -d '\n' > tmp || framework_failure=1 +# Seek 4GB - 8 +dd bs=1 seek=4294967288 if=tmp of=big 2> err || dd_failed=1 +if test "$dd_failed" = 1; then + cat err 1>&2 + echo "$0: cannot create a file large enough for this test," 1>&2 + echo "$0: possibly because this system doesn't support large files;" 1>&2 + echo "$0: Consider rerunning this test on a different file system." 1>&2 + (exit 77); exit 77 +fi + +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 |