blob: 50028f4425c2906826279053ad7b08d37bfb9078 [file] [log] [blame]
/* 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 java.nio;
import java.io.Closeable;
import java.io.FileDescriptor;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.nio.channels.Pipe;
import java.nio.channels.spi.SelectorProvider;
import libcore.io.ErrnoException;
import libcore.io.IoUtils;
import libcore.io.Libcore;
import static libcore.io.OsConstants.*;
/*
* Implements {@link java.nio.channels.Pipe}.
*/
final class PipeImpl extends Pipe {
private final PipeSinkChannel sink;
private final PipeSourceChannel source;
public PipeImpl() throws IOException {
try {
FileDescriptor[] fds = Libcore.os.pipe();
// Which fd is used for which channel is important. Unix pipes are only guaranteed to be
// unidirectional, and indeed are only unidirectional on Linux.
this.sink = new PipeSinkChannel(fds[1]);
this.source = new PipeSourceChannel(fds[0]);
} catch (ErrnoException errnoException) {
throw errnoException.rethrowAsIOException();
}
}
@Override public SinkChannel sink() {
return sink;
}
@Override public SourceChannel source() {
return source;
}
/**
* FileChannelImpl doesn't close its fd itself; it calls close on the object it's given.
*/
private static class FdCloser implements Closeable {
private final FileDescriptor fd;
private FdCloser(FileDescriptor fd) {
this.fd = fd;
}
public void close() throws IOException {
IoUtils.close(fd);
}
}
private class PipeSourceChannel extends Pipe.SourceChannel implements FileDescriptorChannel {
private final FileDescriptor fd;
private final FileChannel channel;
private PipeSourceChannel(FileDescriptor fd) throws IOException {
super(SelectorProvider.provider());
this.fd = fd;
this.channel = NioUtils.newFileChannel(new FdCloser(fd), fd, O_RDONLY);
}
@Override protected void implCloseSelectableChannel() throws IOException {
channel.close();
}
@Override protected void implConfigureBlocking(boolean blocking) throws IOException {
IoUtils.setBlocking(getFD(), blocking);
}
public int read(ByteBuffer buffer) throws IOException {
return channel.read(buffer);
}
public long read(ByteBuffer[] buffers) throws IOException {
return channel.read(buffers);
}
public long read(ByteBuffer[] buffers, int offset, int length) throws IOException {
return channel.read(buffers, offset, length);
}
public FileDescriptor getFD() {
return fd;
}
}
private class PipeSinkChannel extends Pipe.SinkChannel implements FileDescriptorChannel {
private final FileDescriptor fd;
private final FileChannel channel;
private PipeSinkChannel(FileDescriptor fd) throws IOException {
super(SelectorProvider.provider());
this.fd = fd;
this.channel = NioUtils.newFileChannel(new FdCloser(fd), fd, O_WRONLY);
}
@Override protected void implCloseSelectableChannel() throws IOException {
channel.close();
}
@Override protected void implConfigureBlocking(boolean blocking) throws IOException {
IoUtils.setBlocking(getFD(), blocking);
}
public int write(ByteBuffer buffer) throws IOException {
return channel.write(buffer);
}
public long write(ByteBuffer[] buffers) throws IOException {
return channel.write(buffers);
}
public long write(ByteBuffer[] buffers, int offset, int length) throws IOException {
return channel.write(buffers, offset, length);
}
public FileDescriptor getFD() {
return fd;
}
}
}