content: /*
   * 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
   * limitations under the License.
   */
  
  package org.apache.cassandra.utils;
  
  import com.sun.jna.Pointer;
  
  /**
   * An interface to implement for using OS specific native methods.
   * @see NativeLibrary
   */
  @Shared
  public interface NativeLibraryWrapper
  {
      /**
       * Checks if the library has been successfully linked.
       * @return {@code true} if the library has been successfully linked, {@code false} otherwise.
       */
      boolean isAvailable();
  
      int callMlockall(int flags) throws UnsatisfiedLinkError, RuntimeException;
      int callMunlockall() throws UnsatisfiedLinkError, RuntimeException;
      int callFcntl(int fd, int command, long flags) throws UnsatisfiedLinkError, RuntimeException;
      int callPosixFadvise(int fd, long offset, int len, int flag) throws UnsatisfiedLinkError, RuntimeException;
      int callOpen(String path, int flags) throws UnsatisfiedLinkError, RuntimeException;
      int callFsync(int fd) throws UnsatisfiedLinkError, RuntimeException;
      int callClose(int fd) throws UnsatisfiedLinkError, RuntimeException;
      Pointer callStrerror(int errnum) throws UnsatisfiedLinkError, RuntimeException;
      long callGetpid() throws UnsatisfiedLinkError, RuntimeException;
  }
  