62 lines
1.9 KiB
Bash
Executable file
62 lines
1.9 KiB
Bash
Executable file
#!/bin/sh
|
|
# Make sure that 'tail -n0 -f' and 'tail -c0 -f' sleep
|
|
# rather than doing what amounted to a busy-wait.
|
|
|
|
# Copyright (C) 2003-2025 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
|