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LinuxSubstitutions.java
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LinuxSubstitutions.java
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/*
* Copyright (c) 2013, 2019, Oracle and/or its affiliates. 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
package com.oracle.svm.core.posix.linux;
import org.graalvm.nativeimage.StackValue;
import com.oracle.svm.core.Uninterruptible;
import com.oracle.svm.core.annotate.Substitute;
import com.oracle.svm.core.annotate.TargetClass;
import com.oracle.svm.core.posix.PosixUtils;
import com.oracle.svm.core.posix.headers.Time;
import com.oracle.svm.core.posix.headers.linux.LinuxTime;
import com.oracle.svm.core.util.TimeUtils;
@TargetClass(java.lang.System.class)
final class Target_java_lang_System_Linux {
@Substitute
@Uninterruptible(reason = "Does basic math after a simple system call")
private static long nanoTime() {
Time.timespec tp = StackValue.get(Time.timespec.class);
int status = LinuxTime.NoTransitions.clock_gettime(LinuxTime.CLOCK_MONOTONIC(), tp);
PosixUtils.checkStatusIs0(status, "System.nanoTime(): clock_gettime(CLOCK_MONOTONIC) failed.");
return tp.tv_sec() * TimeUtils.nanosPerSecond + tp.tv_nsec();
}
@Substitute
public static String mapLibraryName(String libname) {
return "lib" + libname + ".so";
}
}
/** Dummy class to have a class with the file's name. */
public final class LinuxSubstitutions {
}