1#!/bin/sh
2# Ensure that "tail -f fifo" tails indefinitely.
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
22mkfifo_or_skip_ fifo
23
24echo 1 > fifo &
25echo 1 > exp || framework_failure_
26
27# Terminate any background tail process
28cleanup_() { kill $pid 2>/dev/null && wait $pid; }
29
30# Speedup the non inotify case
31fastpoll='-s.1 --max-unchanged-stats=1'
32
33timeout 10 tail $fastpoll -f fifo > out & pid=$!
34
35check_tail_output() { sleep $1; test -s out; }
36
37# Wait 12.7s for tail to write something.
38retry_delay_ check_tail_output .1 7 || fail=1
39
40compare exp out || fail=1
41
42# Ensure tail is still running
43kill -0 $pid || fail=1
44
45cleanup_
46
47Exit $fail
48