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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.bookkeeper.common.util.nativeio;
  
  /**
   * NativeIO API.
   */
  public interface NativeIO {
  
      // These constants are different per each OS, so the correct values are defined in JNI code
      int O_CREAT = 0x01;
      int O_RDONLY = 0x02;
      int O_WRONLY = 0x04;
      int O_TRUNC = 0x08;
      int O_DIRECT = 0x10;
      int O_DSYNC = 0x20;
  
      int SEEK_SET = 0;
      int SEEK_END = 2;
  
      int FALLOC_FL_ZERO_RANGE = 0x10;
  
      int open(String pathname, int flags, int mode) throws NativeIOException;
  
      int fsync(int fd) throws NativeIOException;
  
      /**
       * fallocate is a linux-only syscall, so callers must handle the possibility that it does
       * not exist.
       */
      int fallocate(int fd, int mode, long offset, long len) throws NativeIOException;
  
      /**
       * posix_fadvise is a linux-only syscall, so callers must handle the possibility that it does
       * not exist.
       */
      int posix_fadvise(int fd, long offset, long len, int flag) throws NativeIOException;
  
      int pwrite(int fd, long pointer, int count, long offset) throws NativeIOException;
  
      long posix_memalign(int alignment, int size) throws NativeIOException;
  
      void free(long pointer) throws NativeIOException;
  
      long lseek(int fd, long offset, int whence) throws NativeIOException;
  
      long pread(int fd, long pointer, long size, long offset) throws NativeIOException;
  
      int close(int fd) throws NativeIOException;
  }
  