1#!/bin/sh
2# Ensure dd handles the 'nocache' flag
3
4# Copyright (C) 2011-2023 Free Software Foundation, Inc.
5
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.
10
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.
15
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <https://www.gnu.org/licenses/>.
18
19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
20print_ver_ dd
21
22# This should not call posix_fadvise
23dd iflag=nocache oflag=nocache if=/dev/null of=/dev/null || fail=1
24
25# We should get an error for trying to process a pipe
26dd count=0 | returns_ 1 dd iflag=nocache count=0 || fail=1
27
28# O_DIRECT is orthogonal to drop cache so mutually exclusive
29returns_ 1 dd iflag=nocache,direct if=/dev/null || fail=1
30
31# The rest ensure that the documented uses cases
32# proceed without error
33for f in ifile ofile; do
34  dd if=/dev/zero of=$f conv=fdatasync count=100 || framework_failure_
35done
36
37# Advise to drop cache for whole file
38if ! dd if=ifile iflag=nocache count=0 2>err; then
39  # We could check for 'Operation not supported' in err here,
40  # but that was seen to be brittle. HPUX returns ENOTTY for example.
41  # So assume that if this basic operation fails, it's due to lack
42  # of support by the system.
43  warn_ 'skipping part; this file system lacks support for posix_fadvise()'
44  skip=1
45fi
46
47if test "$skip" != 1; then
48  # Ensure drop cache for whole file
49  dd of=ofile oflag=nocache conv=notrunc,fdatasync count=0 || fail=1
50
51  # Drop cache for part of file
52  dd if=ifile iflag=nocache skip=10 count=10 of=/dev/null || fail=1
53
54  # Stream data just using readahead cache
55  dd if=ifile of=ofile iflag=nocache oflag=nocache || fail=1
56fi
57
58Exit $fail
59