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#!/bin/sh
# Ensure dd handles the 'nocache' flag
# Copyright (C) 2011 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/>.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
print_ver_ dd
# This should not call posix_fadvise
dd iflag=nocache oflag=nocache if=/dev/null of=/dev/null || fail=1
# We should get an error for trying to process a pipe
dd count=0 | dd iflag=nocache count=0 && fail=1
# O_DIRECT is orthogonal to drop cache so mutually exclusive
dd iflag=nocache,direct if=/dev/null && fail=1
# The rest ensure that the documented uses cases
# proceed without error
for f in ifile ofile; do
dd if=/dev/zero of=$f conv=fdatasync count=100 || framework_failure_
done
# Advise to drop cache for whole file
if ! dd if=ifile iflag=nocache count=0 2>err; then
# We could check for 'Operation not supported' in err here,
# but that was seen to be brittle. HPUX returns ENOTTY for example.
# So assume that if this basic operation fails, it's due to lack
# of support by the system.
warn_ 'skipping part; this file system lacks support for posix_fadvise()'
skip=1
fi
if test "$skip" != 1; then
# Ensure drop cache for whole file
dd of=ofile oflag=nocache conv=notrunc,fdatasync count=0 || fail=1
# Drop cache for part of file
dd if=ifile iflag=nocache skip=10 count=10 of=/dev/null || fail=1
# Stream data just using readahead cache
dd if=ifile of=ofile iflag=nocache oflag=nocache || fail=1
fi
Exit $fail
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