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#!/bin/sh
# Ensure that "tail -f fifo" tails indefinitely.
# Copyright (C) 2009-2015 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
mkfifo_or_skip_ fifo
echo 1 > fifo &
echo 1 > exp || framework_failure_
# Terminate any background tail process
cleanup_() { kill $pid 2>/dev/null && wait $pid; }
# Speedup the non inotify case
fastpoll='-s.1 --max-unchanged-stats=1'
timeout 10 tail $fastpoll -f fifo > out & pid=$!
check_tail_output()
{
local n_sec="$1"
test -s out || { sleep $n_sec; return 1; }
}
# Wait 12.7s for tail to write something.
retry_delay_ check_tail_output .1 7 || fail=1
compare exp out || fail=1
# Ensure tail is still running
kill -0 $pid || fail=1
cleanup_
Exit $fail
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