1#!/bin/sh
2# inotify-based tail -f didn't flush its initial output before blocking
3
4# Copyright (C) 2009-2023 Free Software Foundation, Inc.
5
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <https://www.gnu.org/licenses/>.
18
19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
20print_ver_ tail
21
22# Speedup the non inotify case
23fastpoll='-s.1 --max-unchanged-stats=1'
24
25# Terminate any background tail process
26cleanup_() { kill $pid 2>/dev/null && wait $pid; }
27
28echo line > in || framework_failure_
29# Output should be buffered since we're writing to file
30# so we're depending on the flush to write out
31tail $fastpoll -f in > out & pid=$!
32
33# Wait for 3.1s for the file to be flushed.
34tail_flush()
35{
36  local delay="$1"
37  sleep $delay
38  test -s out
39}
40retry_delay_ tail_flush .1 5 || fail=1
41
42cleanup_
43
44Exit $fail
45