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#!/bin/sh
# Ensure we diagnose failure to drop caches
# We didn't check the return from posix_fadvise() correctly before v9.7
# Copyright (C) 2025 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/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ dd
require_gcc_shared_
# Replace each getxattr and lgetxattr call with a call to these stubs.
# Count those and write the total number of calls to the file "x"
# via a global destructor.
cat > k.c <<'EOF' || framework_failure_
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/types.h>
int posix_fadvise (int fd, off_t offset, off_t len, int advice)
{
fopen ("called", "w");
return ENOTSUP; /* Simulate non standard error indication. */
}
EOF
# Then compile/link it:
gcc_shared_ k.c k.so \
|| framework_failure_ 'failed to build shared library'
touch ifile || framework_failure_
LD_PRELOAD=$LD_PRELOAD:./k.so dd if=ifile iflag=nocache count=0 2>err
ret=$?
test -f called || skip_ "internal test failure: maybe LD_PRELOAD doesn't work?"
grep 'dd: failed to discard cache for: ifile' err || fail=1
# Ensure that the dd command failed
test "$ret" = 1 || fail=1
Exit $fail
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