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#!/bin/sh
# Make sure that 'tail -n0 -f' and 'tail -c0 -f' sleep
# rather than doing what amounted to a busy-wait.
# Copyright (C) 2003-2023 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/>.
# This bug was fixed for 5.0.91
# It skips the test if your system lacks a /proc/$pid/status
# file, or if its contents don't look right.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ tail
require_proc_pid_status_
touch empty || framework_failure_
echo anything > nonempty || framework_failure_
# First verify that -[nc]0 without -f, exit without reading
touch unreadable || framework_failure_
chmod 0 unreadable || framework_failure_
tail -c0 unreadable || fail=1
tail -n0 unreadable || fail=1
# Terminate any background tail process
cleanup_() { kill $pid 2>/dev/null && wait $pid; }
for mode in '' '---disable-inotify'; do
for file in empty nonempty; do
for c_or_n in c n; do
tail --sleep=4 -${c_or_n} 0 -f $mode $file & pid=$!
tail_sleeping()
{
local delay="$1"; sleep $delay
state=$(get_process_status_ $pid)
case $state in
S*) ;;
*) return 1;;
esac
}
# Wait up to 1.5s for tail to sleep
retry_delay_ tail_sleeping .1 4 ||
{ echo $0: process in unexpected state: $state >&2; fail=1; }
cleanup_
done
done
done
Exit $fail
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