1#!/bin/sh
2# This variant of 'assert' would get a Uninit Mem Read reliably in 2.0.9.
3# Due to a race condition in the test, the 'assert' script would get
4# the UMR on Solaris only some of the time, and not at all on Linux/GNU.
5
6# Copyright (C) 2000-2023 Free Software Foundation, Inc.
7
8# This program is free software: you can redistribute it and/or modify
9# it under the terms of the GNU General Public License as published by
10# the Free Software Foundation, either version 3 of the License, or
11# (at your option) any later version.
12
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16# GNU General Public License for more details.
17
18# You should have received a copy of the GNU General Public License
19# along with this program.  If not, see <https://www.gnu.org/licenses/>.
20
21. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
22print_ver_ tail
23
24check_tail_output()
25{
26  local delay="$1"
27  grep "$tail_re" out ||
28    { sleep $delay; return 1; }
29}
30
31# Terminate any background tail process
32cleanup_() { kill $pid 2>/dev/null && wait $pid; }
33
34# Speedup the non inotify case
35fastpoll='-s.1 --max-unchanged-stats=1'
36
37for mode in '' '---disable-inotify'; do
38  rm -f a foo out
39  touch a || framework_failure_
40
41  tail $mode $fastpoll -F a foo > out 2>&1 & pid=$!
42
43  # Wait up to 12.7s for tail to start.
44  echo x > a || framework_failure_
45  tail_re='^x$' retry_delay_ check_tail_output .1 7 ||
46    { cat out; fail=1; break; }
47
48  # Wait up to 12.7s for tail to notice new foo file
49  ok='ok ok ok'
50  echo "$ok" > foo || framework_failure_
51  tail_re="^$ok$" retry_delay_ check_tail_output .1 7 ||
52    { echo "$0: foo: unexpected delay?"; cat out; fail=1; break; }
53
54  cleanup_
55done
56
57Exit $fail
58