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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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package org.apache.cassandra.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sun.jna.LastErrorException;
import com.sun.jna.Native;
import com.sun.jna.Pointer;

/**
 * A {@code NativeLibraryWrapper} implementation for Darwin/Mac.
 * 

* When JNA is initialized, all methods that have the 'native' keyword * will be attmpted to be linked against. As Java doesn't have the equivalent * of a #ifdef, this means if a native method like posix_fadvise is defined in the * class but not available on the target operating system (e.g. * posix_fadvise is not availble on Darwin/Mac) this will cause the entire * initial linking and initialization of JNA to fail. This means other * native calls that are supported on that target operating system will be * unavailable simply because of one native defined method not supported * on the runtime operating system. * @see org.apache.cassandra.utils.NativeLibraryWrapper * @see NativeLibrary */ public class NativeLibraryDarwin implements NativeLibraryWrapper { private static final Logger logger = LoggerFactory.getLogger(NativeLibraryDarwin.class); private static boolean available; static { try { Native.register("c"); available = true; } catch (NoClassDefFoundError e) { logger.warn("JNA not found. Native methods will be disabled."); } catch (UnsatisfiedLinkError e) { logger.error("Failed to link the C library against JNA. Native methods will be unavailable.", e); } catch (NoSuchMethodError e) { logger.warn("Obsolete version of JNA present; unable to register C library. Upgrade to JNA 3.2.7 or later"); } } private static native int mlockall(int flags) throws LastErrorException; private static native int munlockall() throws LastErrorException; private static native int fcntl(int fd, int command, long flags) throws LastErrorException; private static native int open(String path, int flags) throws LastErrorException; private static native int fsync(int fd) throws LastErrorException; private static native int close(int fd) throws LastErrorException; private static native Pointer strerror(int errnum) throws LastErrorException; private static native long getpid() throws LastErrorException; public int callMlockall(int flags) throws UnsatisfiedLinkError, RuntimeException { return mlockall(flags); } public int callMunlockall() throws UnsatisfiedLinkError, RuntimeException { return munlockall(); } public int callFcntl(int fd, int command, long flags) throws UnsatisfiedLinkError, RuntimeException { return fcntl(fd, command, flags); } public int callPosixFadvise(int fd, long offset, int len, int flag) throws UnsatisfiedLinkError, RuntimeException { // posix_fadvise is not available on Darwin/Mac throw new UnsatisfiedLinkError(); } public int callOpen(String path, int flags) throws UnsatisfiedLinkError, RuntimeException { return open(path, flags); } public int callFsync(int fd) throws UnsatisfiedLinkError, RuntimeException { return fsync(fd); } public int callClose(int fd) throws UnsatisfiedLinkError, RuntimeException { return close(fd); } public Pointer callStrerror(int errnum) throws UnsatisfiedLinkError, RuntimeException { return strerror(errnum); } public long callGetpid() throws UnsatisfiedLinkError, RuntimeException { return getpid(); } public boolean isAvailable() { return available; } }





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