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#!/bin/sh
# Ensure that cat outputs processed data immediately.
# Copyright (C) 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
cat --version
fi
. $srcdir/test-lib.sh
# Use a fifo rather than a pipe in the tests below
# so that the producer (cat) will wait until the
# consumer (dd) opens the fifo therefore increasing
# the chance that dd will read the data from each
# write separately.
mkfifo fifo || framework_failure
fail=0
echo 1 > exp
dd count=1 if=fifo > out &
(echo 1; sleep .5; echo 2) | cat -v > fifo
wait # for dd to complete
# Though unlikely, this test may fail because dd was starved
# between opening the fifo and reading from it until after the
# second echo. So ask to double check rather than failing.
compare out exp || skip_test_ "possible test failure. Please verify."
Exit $fail
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