76 lines
2.4 KiB
Bash
Executable file
76 lines
2.4 KiB
Bash
Executable file
#!/bin/sh
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# make sure that dd doesn't allocate memory unnecessarily
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# Copyright (C) 2013-2025 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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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ dd
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# Determine basic amount of memory needed.
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echo . > f || framework_failure_
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vm=$(get_min_ulimit_v_ timeout 10 dd if=f of=f2 status=none) \
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|| skip_ 'shell lacks ulimit, or ASAN enabled'
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rm f f2 || framework_failure_
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# count and skip are zero, we don't need to allocate memory
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(ulimit -v $vm && dd bs=30M count=0) || fail=1
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(ulimit -v $vm && dd ibs=30M count=0) || fail=1
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(ulimit -v $vm && dd obs=30M count=0) || fail=1
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check_dd_seek_alloc() {
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local file="$1"
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local buf="$2"
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test "$file" = 'in' && { dd_file=if; dd_op=skip; }
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test "$file" = 'out' && { dd_file=of; dd_op=seek; }
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test "$buf" = 'in' && { dd_buf=ibs; }
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test "$buf" = 'out' && { dd_buf=obs; }
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test "$buf" = 'both' && { dd_buf=bs; }
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# Provide input to the "tape"
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timeout 10 dd count=1 if=/dev/zero of=tape&
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# Allocate buffer and read from the "tape"
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(ulimit -v $vm \
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&& timeout 10 dd $dd_buf=30M $dd_op=1 count=0 $dd_file=tape)
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local ret=$?
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# Be defensive in case the tape reader is blocked for some reason
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test $ret = 124 && framework_failure_
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# This should happen without delay,
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# and is used to ensure we've not multiple writers to the "tape"
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wait
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# We want the "tape" reader to fail iff allocating
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# a large buffer corresponding to the file being read
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case "$file$buf" in
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inout|outin) test $ret = 0;;
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*) test $ret != 0;;
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esac
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}
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# Use a fifo for which seek fails, but read does not.
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# For non seekable output we need to allocate a buffer
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# when simulating seeking with a read.
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if mkfifo tape; then
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for file in 'in' 'out'; do
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for buf in 'both' 'in' 'out'; do
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check_dd_seek_alloc "$file" "$buf" || fail=1
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done
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done
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fi
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Exit $fail
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