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#!/bin/sh
# ensure that tac works with non-seekable or quasi-seekable inputs
# Copyright (C) 2011-2023 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 3 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, see <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ tac
echo x | tac - - > out 2> err || fail=1
echo x > exp || framework_failure_
compare exp out || fail=1
compare /dev/null err || fail=1
# Make sure it works on funny files in /proc and /sys.
for file in /proc/version /sys/kernel/profiling; do
if test -r $file; then
cp -f $file copy &&
tac copy > exp1 || framework_failure_
tac $file > out1 || fail=1
compare exp1 out1 || fail=1
fi
done
# Assume timeout is due to failure to close stdin with <&-
# which was seen on NetBSD 7.1 / x86_64
returns_ 124 timeout 10 tac - - <&- 2>err && skip_ 'error closing stdin'
# This failed due to heap corruption from v8.15-v8.25 inclusive.
returns_ 1 timeout 10 tac - - <&- 2>err || fail=1
Exit $fail
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