| /* |
| * 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. |
| */ |
| |
| // BEGIN android-note |
| // address length was changed from long to int for performance reasons. |
| // END android-note |
| |
| package org.apache.harmony.luni.platform; |
| |
| import java.io.FileDescriptor; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| |
| class OSFileSystem implements IFileSystem { |
| |
| private static final OSFileSystem singleton = new OSFileSystem(); |
| |
| public static OSFileSystem getOSFileSystem() { |
| return singleton; |
| } |
| |
| private OSFileSystem() { |
| } |
| |
| private final void validateLockArgs(int type, long start, long length) { |
| if ((type != IFileSystem.SHARED_LOCK_TYPE) |
| && (type != IFileSystem.EXCLUSIVE_LOCK_TYPE)) { |
| throw new IllegalArgumentException("Illegal lock type requested."); |
| } |
| |
| // Start position |
| if (start < 0) { |
| throw new IllegalArgumentException("start < 0"); |
| } |
| |
| // Length of lock stretch |
| if (length < 0) { |
| throw new IllegalArgumentException("length < 0"); |
| } |
| } |
| |
| private native int lockImpl(int fd, long start, long length, int type, boolean wait); |
| |
| /** |
| * Returns the granularity for virtual memory allocation. |
| * Note that this value for Windows differs from the one for the |
| * page size (64K and 4K respectively). |
| */ |
| public native int getAllocGranularity(); |
| |
| public native long length(int fd); |
| |
| public boolean lock(int fd, long start, long length, int type, boolean waitFlag) |
| throws IOException { |
| // Validate arguments |
| validateLockArgs(type, start, length); |
| int result = lockImpl(fd, start, length, type, waitFlag); |
| return result != -1; |
| } |
| |
| private native void unlockImpl(int fd, long start, long length) throws IOException; |
| |
| public void unlock(int fd, long start, long length) throws IOException { |
| // Validate arguments |
| validateLockArgs(IFileSystem.SHARED_LOCK_TYPE, start, length); |
| unlockImpl(fd, start, length); |
| } |
| |
| public native void fsync(int fd, boolean metadata) throws IOException; |
| |
| /* |
| * File position seeking. |
| */ |
| public native long seek(int fd, long offset, int whence) throws IOException; |
| |
| /* |
| * Direct read/write APIs work on addresses. |
| */ |
| public native long readDirect(int fd, int address, int offset, int length); |
| |
| public native long writeDirect(int fd, int address, int offset, int length); |
| |
| /* |
| * Indirect read/writes work on byte[]'s |
| */ |
| public native long read(int fd, byte[] bytes, int offset, int length) throws IOException; |
| |
| public native long write(int fd, byte[] bytes, int offset, int length) throws IOException; |
| |
| /* |
| * Scatter/gather calls. |
| */ |
| public native long readv(int fd, int[] addresses, int[] offsets, int[] lengths, int size) |
| throws IOException; |
| |
| public native long writev(int fd, int[] addresses, int[] offsets, int[] lengths, int size) |
| throws IOException; |
| |
| public native void truncate(int fd, long size) throws IOException; |
| |
| public native int open(String path, int mode) throws FileNotFoundException; |
| |
| public native long transfer(int fd, FileDescriptor sd, long offset, long count) |
| throws IOException; |
| |
| public native int ioctlAvailable(FileDescriptor fileDescriptor) throws IOException; |
| } |