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#!/bin/sh
# This test would fail with tail from pre-1.22i textutils.
# Copyright (C) 1999-2015 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 <http://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ tail
yes > t &
yes_pid=$!
while :; do
test -s t \
&& break
sleep .1
done
tail -n 1 t &
tail_pid=$!
kill $yes_pid
# This test is racy, and can fail under unusual circumstances.
# On a very busy system, tail will fail to notice that $yes_pid is gone.
# Then the following kill will succeed and cause this test to fail.
# Wait for up to 3 seconds for tail to detect the death of $yes_pid.
for i in $(seq 30); do
kill -0 $tail_pid || break
echo sleep 0.1s
sleep .1
done
kill $tail_pid && fail=1 || :
Exit $fail
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