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#!/bin/sh
# Make sure that `tail -f' returns immediately if a file doesn't exist
# while `tail -F' waits for it to appear.
# 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
. $srcdir/test-lib.sh
require_proc_pid_status_
touch here || framework_failure
touch k || framework_failure
(touch unreadable && chmod a-r unreadable) || framework_failure
fail=0
tail -s0.1 -f not_here &
pid=$!
sleep .5
state=$(get_process_status_ $pid)
if test -n "$state"; then
case $state in
S*) echo $0: process still active 1>&2; fail=1 ;;
*) ;;
esac
kill $pid
fi
# Check if the file is really not accessible before use it.
if ! cat unreadable; then
tail -s0.1 -f unreadable &
pid=$!
sleep .5
state=$(get_process_status_ $pid)
if test -n "$state"; then
case $state in
S*) echo $0: process still active 1>&2; fail=1 ;;
*) ;;
esac
kill $pid
fi
fi
(tail -s0.1 -f here 2>tail.err) &
pid=$!
sleep .5
state=$(get_process_status_ $pid)
if test -n "$state"; then
case $state in
S*) ;;
*) echo $0: process died 1>&2; fail=1 ;;
esac
kill $pid
fi
# `tail -F' must wait in any case.
(tail -s0.1 -F here 2>>tail.err) &
pid=$!
sleep .5
state=$(get_process_status_ $pid)
if test -n "$state"; then
case $state in
S*) ;;
*) echo $0: process died 1>&2; fail=1 ;;
esac
kill $pid
fi
tail -s0.1 -F unreadable &
pid=$!
sleep .5
state=$(get_process_status_ $pid)
if test -n "$state"; then
case $state in
S*) ;;
*) echo $0: process died 1>&2; fail=1 ;;
esac
kill $pid
fi
tail -s0.1 -F not_here &
pid=$!
sleep .5
state=$(get_process_status_ $pid)
if test -n "$state"; then
case $state in
S*) ;;
*) echo $0: process died 1>&2; fail=1 ;;
esac
kill $pid
fi
test -s tail.err && fail=1
tail -s.1 -F k > tail.out &
pid=$!
sleep .5
mv k l
sleep .5
touch k
mv k l
sleep .5
echo NO >> l
sleep .5
kill $pid
test -s tail.out && fail=1
Exit $fail
|
