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