2 # Ensure that cat outputs processed data immediately.
4 # Copyright (C) 2009 Free Software Foundation, Inc.
6 # This program is free software: you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation, either version 3 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
19 if test "$VERBOSE" = yes; then
26 # Use a fifo rather than a pipe in the tests below
27 # so that the producer (cat) will wait until the
28 # consumer (dd) opens the fifo therefore increasing
29 # the chance that dd will read the data from each
31 mkfifo fifo || framework_failure
36 dd count=1 if=fifo > out &
37 (echo 1; sleep .5; echo 2) | cat -v > fifo
38 wait # for dd to complete
40 # Though unlikely, this test may fail because dd was starved
41 # between opening the fifo and reading from it until after the
42 # second echo. So ask to double check rather than failing.
43 compare out exp || skip_test_ "possible test failure. Please verify."