62 lines
2.6 KiB
Java
62 lines
2.6 KiB
Java
/*
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* Copyright (c) 2024 Alibaba Group Holding Limited. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.lang.foreign.Arena;
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import java.lang.foreign.FunctionDescriptor;
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import java.lang.foreign.Linker;
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import java.lang.foreign.MemorySegment;
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import java.lang.foreign.SymbolLookup;
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import java.lang.foreign.ValueLayout;
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import java.lang.invoke.MethodHandle;
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public class CreationTimeHelper extends NativeTestHelper {
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static {
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System.loadLibrary("CreationTimeHelper");
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}
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final static Linker abi = Linker.nativeLinker();
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static final SymbolLookup lookup = SymbolLookup.loaderLookup();
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final static MethodHandle methodHandle = abi.
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downcallHandle(lookup.findOrThrow("linuxIsCreationTimeSupported"),
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FunctionDescriptor.of(C_BOOL, C_POINTER));
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// Helper so as to determine birth time support or not on Linux.
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// Support is determined in a two-step process:
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// 1. Determine if `statx` system call is available. If available proceed,
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// otherwise return false.
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// 2. Perform an actual `statx` call on the given file and check for birth
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// time support in the mask returned from the call. This is needed,
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// since some file systems, like nfs/tmpfs etc., don't support birth
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// time even though the `statx` system call is available.
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static boolean linuxIsCreationTimeSupported(String file) throws Throwable {
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if (!abi.defaultLookup().find("statx").isPresent()) {
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return false;
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}
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try (var arena = Arena.ofConfined()) {
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MemorySegment s = arena.allocateFrom(file);
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return (boolean)methodHandle.invokeExact(s);
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}
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}
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}
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