1#!/bin/sh
2# Test the --pid option of tail.
3
4# Copyright (C) 2003-2020 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
21getlimits_
22
23touch empty here || framework_failure_
24
25# Terminate any background tail process
26cleanup_() { kill $pid 2>/dev/null && wait $pid; }
27
28for mode in '' '---disable-inotify'; do
29  # Use tail itself to create a background process to monitor,
30  # which will auto exit when "here" is removed.
31  tail -f $mode here & pid=$!
32
33  # Ensure that tail --pid=PID does not exit when PID is alive.
34  returns_ 124 timeout 1 tail -f -s.1 --pid=$pid $mode here || fail=1
35
36  cleanup_
37
38  # Ensure that tail --pid=PID exits with success status when PID is dead.
39  # Use an unlikely-to-be-live PID
40  timeout 10 tail -f -s.1 --pid=$PID_T_MAX $mode empty
41  ret=$?
42  test $ret = 124 && skip_ "pid $PID_T_MAX present or tail too slow"
43  test $ret = 0 || fail=1
44
45  # Ensure tail doesn't wait for data when PID is dead
46  returns_ 124 timeout 10 tail -f -s10 --pid=$PID_T_MAX $mode empty && fail=1
47done
48
49Exit $fail
50