#!/bin/sh
# Test the --pid option of tail.

# Copyright (C) 2003, 2006-2009 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 <http://www.gnu.org/licenses/>.

if test "$VERBOSE" = yes; then
  set -x
  tail --version
fi

. $srcdir/test-lib.sh
getlimits_

touch here || framework_failure

fail=0

for inotify in ---disable-inotify ''; do
  # Use tail itself to create a background process to monitor,
  # which will auto exit when "here" is removed.
  tail -f $inotify here &
  bg_pid=$!

  # Ensure that tail --pid=PID does not exit when PID is alive.
  timeout 1 tail -f -s.1 --pid=$bg_pid $inotify here
  test $? = 124 || fail=1

  # Cleanup background process
  kill $bg_pid

  # Ensure that tail --pid=PID exits with success status when PID is dead.
  # Use an unlikely-to-be-live PID
  timeout 3 tail -f -s.1 --pid=$PID_T_MAX $inotify /dev/null
  ret=$?
  test $ret = 124 && skip_test_ "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
  timeout 3 tail -f -s10 --pid=$PID_T_MAX $inotify /dev/null
  test $? = 124 && fail=1
done

Exit $fail
