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/*
* Copyright (c) 2024 Alibaba Group Holding Limited. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.lang.foreign.Arena;
import java.lang.foreign.FunctionDescriptor;
import java.lang.foreign.Linker;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.SymbolLookup;
import java.lang.foreign.ValueLayout;
import java.lang.invoke.MethodHandle;
public class CreationTimeHelper extends NativeTestHelper {
static {
System.loadLibrary("CreationTimeHelper");
}
final static Linker abi = Linker.nativeLinker();
static final SymbolLookup lookup = SymbolLookup.loaderLookup();
final static MethodHandle methodHandle = abi.
downcallHandle(lookup.findOrThrow("linuxIsCreationTimeSupported"),
FunctionDescriptor.of(C_BOOL, C_POINTER));
// Helper so as to determine birth time support or not on Linux.
// Support is determined in a two-step process:
// 1. Determine if `statx` system call is available. If available proceed,
// otherwise return false.
// 2. Perform an actual `statx` call on the given file and check for birth
// time support in the mask returned from the call. This is needed,
// since some file systems, like nfs/tmpfs etc., don't support birth
// time even though the `statx` system call is available.
static boolean linuxIsCreationTimeSupported(String file) throws Throwable {
if (!abi.defaultLookup().find("statx").isPresent()) {
return false;
}
try (var arena = Arena.ofConfined()) {
MemorySegment s = arena.allocateFrom(file);
return (boolean)methodHandle.invokeExact(s);
}
}
}
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