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#!/bin/sh
# make sure that dd doesn't allocate memory unnecessarily
# Copyright (C) 2013-2020 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 <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ dd
# Determine basic amount of memory needed.
echo . > f || framework_failure_
vm=$(get_min_ulimit_v_ timeout 10 dd if=f of=f2 status=none) \
|| skip_ "this shell lacks ulimit support"
rm f f2 || framework_failure_
# count and skip are zero, we don't need to allocate memory
(ulimit -v $vm && dd bs=30M count=0) || fail=1
(ulimit -v $vm && dd ibs=30M count=0) || fail=1
(ulimit -v $vm && dd obs=30M count=0) || fail=1
check_dd_seek_alloc() {
local file="$1"
local buf="$2"
test "$file" = 'in' && { dd_file=if; dd_op=skip; }
test "$file" = 'out' && { dd_file=of; dd_op=seek; }
test "$buf" = 'in' && { dd_buf=ibs; }
test "$buf" = 'out' && { dd_buf=obs; }
test "$buf" = 'both' && { dd_buf=bs; }
# Provide input to the "tape"
timeout 10 dd count=1 if=/dev/zero of=tape&
# Allocate buffer and read from the "tape"
(ulimit -v $vm \
&& timeout 10 dd $dd_buf=30M $dd_op=1 count=0 $dd_file=tape)
local ret=$?
# Be defensive in case the tape reader is blocked for some reason
test $ret = 124 && framework_failure_
# This should happen without delay,
# and is used to ensure we've not multiple writers to the "tape"
wait
# We want the "tape" reader to fail iff allocating
# a large buffer corresponding to the file being read
case "$file$buf" in
inout|outin) test $ret = 0;;
*) test $ret != 0;;
esac
}
# Use a fifo for which seek fails, but read does not.
# For non seekable output we need to allocate a buffer
# when simulating seeking with a read.
if mkfifo tape; then
for file in 'in' 'out'; do
for buf in 'both' 'in' 'out'; do
check_dd_seek_alloc "$file" "$buf" || fail=1
done
done
fi
Exit $fail
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