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#!/bin/sh
# Make sure that `tail -n0 -f' and `tail -c0 -f' sleep
# rather than doing what amounted to a busy-wait.
# Copyright (C) 2003, 2006-2008 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/>.
# This bug was fixed for 5.0.91
# It skips the test if your system lacks a /proc/$pid/status
# file, or if its contents don't look right.
if test "$VERBOSE" = yes; then
set -x
tail --version
fi
. $srcdir/test-lib.sh
sleep 2 &
pid=$!
sleep .5
grep '^State:[ ]*[S]' /proc/$pid/status > /dev/null 2>&1 ||
skip_test_ "/proc/$pid/status: missing or 'different'"
kill $pid
touch empty || framework_failure
echo anything > nonempty || framework_failure
fail=0
for file in empty nonempty; do
for c_or_n in c n; do
tail --sleep=4 -${c_or_n} 0 -f $file &
pid=$!
sleep .5
set _ `sed -n '/^State:[ ]*\([^ ]\)/s//\1/p' /proc/$pid/status`
shift # Remove the leading `_'.
state=$1
case $state in
S*) ;;
*) echo $0: process in unexpected state: $state 1>&2; fail=1 ;;
esac
kill $pid
done
done
Exit $fail
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