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#!/bin/sh
# test dd reblocking vs. bs=
# Copyright (C) 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/>.
if test "$VERBOSE" = yes; then
set -x
dd --version
fi
. $srcdir/lang-default
. $srcdir/test-lib.sh
cat <<\EOF > exp-reblock || framework_failure
0+2 records in
1+1 records out
4 bytes (4 B) copied
EOF
cat <<\EOF > exp-no-reblock || framework_failure
0+2 records in
0+2 records out
4 bytes (4 B) copied
EOF
fail=0
# ensure that dd reblocks when bs= is not specified
(echo x; sleep .1; echo y) | dd ibs=3 obs=3 > out 2> err || fail=1
sed 's/,.*//' err > k && mv k err
compare err exp-reblock || fail=1
# Demonstrate that bs=N supersedes even following ibs= and obs= settings.
# Choosing a delay of 0.1 would result in an occasional lost race where
# the consumer's first read would consume 3 bytes rather than the expected 2.
# Not wanting to sleep a full second, I'll raise that to 0.3.
(printf ab; sleep .3; printf cd) | dd bs=3 ibs=1 obs=1 > out 2> err || fail=1
sed 's/,.*//' err > k && mv k err
compare err exp-no-reblock || fail=1
Exit $fail
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