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#!/bin/sh
# Test the --pid option of tail.
# Copyright (C) 2003-2022 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/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ tail
getlimits_
touch empty here || framework_failure_
# Terminate any background tail process
cleanup_() { kill $pid 2>/dev/null && wait $pid; }
for mode in '' '---disable-inotify'; do
# Use tail itself to create a background process to monitor,
# which will auto exit when "here" is removed.
tail -f $mode here & pid=$!
# Ensure that tail --pid=PID does not exit when PID is alive.
returns_ 124 timeout 1 tail -f -s.1 --pid=$pid $mode here || fail=1
cleanup_
# Ensure that tail --pid=PID exits with success status when PID is dead.
# Use an unlikely-to-be-live PID
timeout 10 tail -f -s.1 --pid=$PID_T_MAX $mode empty
ret=$?
test $ret = 124 && skip_ "pid $PID_T_MAX present or tail too slow"
test $ret = 0 || fail=1
# Ensure tail doesn't wait for data when PID is dead
returns_ 124 timeout 10 tail -f -s10 --pid=$PID_T_MAX $mode empty && fail=1
done
Exit $fail
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