58 lines
2 KiB
Bash
Executable file
58 lines
2 KiB
Bash
Executable file
#!/bin/sh
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# Ensure dd handles the 'nocache' flag
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# Copyright (C) 2011-2025 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ dd
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# This should not call posix_fadvise
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dd iflag=nocache oflag=nocache if=/dev/null of=/dev/null || fail=1
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# We should get an error for trying to process a pipe
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dd count=0 | returns_ 1 dd iflag=nocache count=0 || fail=1
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# O_DIRECT is orthogonal to drop cache so mutually exclusive
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returns_ 1 dd iflag=nocache,direct if=/dev/null || fail=1
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# The rest ensure that the documented uses cases
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# proceed without error
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for f in ifile ofile; do
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dd if=/dev/zero of=$f conv=fdatasync count=100 || framework_failure_
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done
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# Advise to drop cache for whole file
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if ! dd if=ifile iflag=nocache count=0 2>err; then
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# We could check for 'Operation not supported' in err here,
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# but that was seen to be brittle. HPUX returns ENOTTY for example.
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# So assume that if this basic operation fails, it's due to lack
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# of support by the system.
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warn_ 'skipping part; this file system lacks support for posix_fadvise()'
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skip=1
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fi
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if test "$skip" != 1; then
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# Ensure drop cache for whole file
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dd of=ofile oflag=nocache conv=notrunc,fdatasync count=0 || fail=1
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# Drop cache for part of file
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dd if=ifile iflag=nocache skip=10 count=10 of=/dev/null || fail=1
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# Stream data just using readahead cache
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dd if=ifile of=ofile iflag=nocache oflag=nocache || fail=1
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fi
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Exit $fail
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