Trivial tidying up of networking code.

Removing cruft and renaming things.

Change-Id: I317726c40a1addf3a1ad9d905239438424082549
diff --git a/libcore/luni/src/main/java/java/net/InetAddress.java b/libcore/luni/src/main/java/java/net/InetAddress.java
index 31be34e..85b4d0b 100644
--- a/libcore/luni/src/main/java/java/net/InetAddress.java
+++ b/libcore/luni/src/main/java/java/net/InetAddress.java
@@ -524,22 +524,6 @@
     private static native String getnameinfo(byte[] addr);
     // END android-changed
 
-    // BEGIN android-removed
-    // static int inetAddr(String host) throws UnknownHostException
-    // END android-removed
-
-    // BEGIN android-removed
-    // static native int inetAddrImpl(String host) throws UnknownHostException;
-    // END android-removed
-
-    // BEGIN android-removed
-    // static native String inetNtoaImpl(int hipAddr);
-    // END android-removed
-
-    // BEGIN android-removed
-    // static native InetAddress getHostByNameImpl(String name) throws UnknownHostException;
-    // END android-removed
-
     static String getHostNameInternal(String host, boolean isCheck) throws UnknownHostException {
         if (host == null || 0 == host.length()) {
             return Inet4Address.LOOPBACK.getHostAddress();
diff --git a/libcore/luni/src/main/java/org/apache/harmony/luni/net/PlainSocketImpl.java b/libcore/luni/src/main/java/org/apache/harmony/luni/net/PlainSocketImpl.java
index e6268c2..e7c6c77 100644
--- a/libcore/luni/src/main/java/org/apache/harmony/luni/net/PlainSocketImpl.java
+++ b/libcore/luni/src/main/java/org/apache/harmony/luni/net/PlainSocketImpl.java
@@ -161,7 +161,7 @@
     protected synchronized int available() throws IOException {
         // we need to check if the input has been shutdown. If so
         // we should return that there is no data to be read
-        if (shutdownInput == true) {
+        if (shutdownInput) {
             return 0;
         }
         return Platform.getFileSystem().ioctlAvailable(fd);
@@ -191,9 +191,7 @@
 
     @Override
     protected void connect(String aHost, int aPort) throws IOException {
-        // BEGIN android-changed: remove useless IPv6 check.
-        connect(netImpl.getHostByName(aHost), aPort);
-        // END android-changed
+        connect(InetAddress.getByName(aHost), aPort);
     }
 
     @Override
@@ -290,7 +288,7 @@
             // server during the bind.
             return;
         }
-        netImpl.listenStreamSocket(fd, backlog);
+        netImpl.listen(fd, backlog);
     }
 
     @Override
@@ -348,9 +346,7 @@
         if (null == proxyName) {
             proxyName = addr.getAddress().getHostAddress();
         }
-        // BEGIN android-changed: remove useless IPv6 check.
-        return netImpl.getHostByName(proxyName);
-        // END android-changed
+        return InetAddress.getByName(proxyName);
     }
 
     /**
diff --git a/libcore/luni/src/main/java/org/apache/harmony/luni/platform/INetworkSystem.java b/libcore/luni/src/main/java/org/apache/harmony/luni/platform/INetworkSystem.java
index 7ffb30c..64da5f7 100644
--- a/libcore/luni/src/main/java/org/apache/harmony/luni/platform/INetworkSystem.java
+++ b/libcore/luni/src/main/java/org/apache/harmony/luni/platform/INetworkSystem.java
@@ -45,9 +45,6 @@
      */
     public final int SOCKET_CONNECT_STEP_CHECK = 1;
 
-    /*
-     * socket accept
-     */
     public void accept(FileDescriptor fdServer, SocketImpl newSocket,
             FileDescriptor fdnewSocket, int timeout) throws IOException;
 
@@ -63,30 +60,17 @@
     public int write(FileDescriptor fd, byte[] data, int offset, int count)
             throws IOException;
     
-    // BEGIN android-changed
-    //     added offset parameter
     public int writeDirect(FileDescriptor fd, int address, int offset, int count)
             throws IOException;
-    // END android-changed
 
-    // BEGIN android-removed
-    // public int writev(FileDescriptor fd, Object[] buffers, int[] offsets,
-    //         int[] counts, int length) throws IOException;
-    // END android-removed
+    public void setNonBlocking(FileDescriptor aFD, boolean block) throws IOException;
 
-    public void setNonBlocking(FileDescriptor aFD, boolean block)
-            throws IOException;
-
-    // BEGIN android-changed (we always throw on error, the value returned was always 0)
     public void connect(FileDescriptor aFD, int trafficClass,
             InetAddress inetAddress, int port) throws IOException;
-    // END android-changed
 
-    // BEGIN android-changed
     public int connectWithTimeout(FileDescriptor aFD, int timeout,
             int trafficClass, InetAddress hostname, int port, int step,
             byte[] context) throws IOException;
-    // END android-changed
 
     public int sendDatagram(FileDescriptor fd, byte[] data, int offset,
             int length, int port, boolean bindToDevice, int trafficClass,
@@ -129,11 +113,6 @@
     public void connectDatagram(FileDescriptor aFD, int port, int trafficClass,
             InetAddress inetAddress) throws SocketException;
 
-    // BEGIN android-removed
-    // public int receiveStream(FileDescriptor aFD, byte[] data, int offset,
-    //         int count, int timeout) throws IOException;
-    // END android-removed
-
     public void shutdownInput(FileDescriptor descriptor) throws IOException;
 
     public void shutdownOutput(FileDescriptor descriptor) throws IOException;
@@ -142,20 +121,13 @@
 
     public void sendUrgentData(FileDescriptor fd, byte value);
 
-    // BEGIN android-removed
-    // public void acceptStreamSocket(FileDescriptor fdServer,
-    //         SocketImpl newSocket, FileDescriptor fdnewSocket, int timeout)
-    //         throws IOException;
-    // END android-removed
-
     public void createServerStreamSocket(FileDescriptor aFD, boolean preferIPv4Stack)
             throws SocketException;
 
     public void createStreamSocket(FileDescriptor aFD, boolean preferIPv4Stack)
             throws SocketException;
     
-    public void listenStreamSocket(FileDescriptor aFD, int backlog)
-            throws SocketException;
+    public void listen(FileDescriptor aFD, int backlog) throws SocketException;
 
     public void connectStreamWithTimeoutSocket(FileDescriptor aFD, int aport,
             int timeout, int trafficClass, InetAddress inetAddress)
@@ -164,9 +136,7 @@
     public int sendDatagram2(FileDescriptor fd, byte[] data, int offset,
             int length, int port, InetAddress inetAddress) throws IOException;
 
-    // BEGIN android-changed: remove useless IPv6 check.
     public InetAddress getSocketLocalAddress(FileDescriptor aFD);
-    // END android-changed
 
     /**
      * Select the given file descriptors for read and write operations.
@@ -202,7 +172,6 @@
             int numReadable, int numWritable, long timeout, int[] flags)
             throws SocketException;
 
-    // BEGIN android-changed: remove useless IPv6 check.
     /*
      * Query the IP stack for the local port to which this socket is bound.
      * 
@@ -210,7 +179,6 @@
      * @return int the local port to which the socket is bound
      */
     public int getSocketLocalPort(FileDescriptor aFD);
-    // END android-changed
 
     /*
      * Query the IP stack for the nominated socket option.
@@ -234,36 +202,16 @@
     public void setSocketOption(FileDescriptor aFD, int opt, Object optVal)
             throws SocketException;
 
-    /*
-     * Close the socket in the IP stack.
-     * 
-     * @param aFD the socket descriptor
-     */
+    // TODO: change OSFileSystem.close to take a FileDescriptor, and lose this duplicate.
     public void socketClose(FileDescriptor aFD) throws IOException;
 
-    public InetAddress getHostByAddr(byte[] addr) throws UnknownHostException;
-
-    // BEGIN android-changed: remove useless IPv6 check.
-    public InetAddress getHostByName(String addr) throws UnknownHostException;
-    // END android-changed
-
+    // TODO: change the single caller so that recvConnectedDatagram
+    // can mutate the InetAddress as a side-effect.
     public void setInetAddress(InetAddress sender, byte[] address);
 
-    // BEGIN android-added
-    public String byteArrayToIpString(byte[] address)
-            throws UnknownHostException;
+    public String byteArrayToIpString(byte[] address) throws UnknownHostException;
 
-    public byte[] ipStringToByteArray(String address)
-            throws UnknownHostException;
-    // END android-added
-
-    // BEGIN android-removed
-    // public boolean isReachableByICMP(InetAddress dest,InetAddress source,int ttl,int timeout);
-    // END android-removed
+    public byte[] ipStringToByteArray(String address) throws UnknownHostException;
 
     public Channel inheritedChannel();
-
-    // BEGIN android-removed: we do this statically, when we start the VM.
-    // public void oneTimeInitialization(boolean jcl_supports_ipv6);
-    // END android-removed
 }
diff --git a/libcore/luni/src/main/java/org/apache/harmony/luni/platform/OSNetworkSystem.java b/libcore/luni/src/main/java/org/apache/harmony/luni/platform/OSNetworkSystem.java
index 8d7ce58..4f2d47d 100644
--- a/libcore/luni/src/main/java/org/apache/harmony/luni/platform/OSNetworkSystem.java
+++ b/libcore/luni/src/main/java/org/apache/harmony/luni/platform/OSNetworkSystem.java
@@ -15,10 +15,6 @@
  *  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;
@@ -29,19 +25,13 @@
 import java.net.SocketImpl;
 import java.net.UnknownHostException;
 import java.nio.channels.Channel;
-// BEGIN android-removed
-// import java.nio.channels.SelectableChannel;
-// END android-removed
 
 /**
  * This wraps native code that implements the INetworkSystem interface.
+ * Address length was changed from long to int for performance reasons.
  */
 final class OSNetworkSystem implements INetworkSystem {
-
-    private static final int ERRORCODE_SOCKET_TIMEOUT = -209;
-    private static final int ERRORCODE_SOCKET_INTERRUPTED = -208;
-
-    private static OSNetworkSystem singleton = new OSNetworkSystem();
+    private static final OSNetworkSystem singleton = new OSNetworkSystem();
 
     public static OSNetworkSystem getOSNetworkSystem() {
         return singleton;
@@ -55,12 +45,10 @@
 
     public native void bind(FileDescriptor fd, InetAddress inetAddress, int port) throws SocketException;
 
-    // BEGIN android-changed (removed unused return value and useless native method)
     public void connect(FileDescriptor fd, int trafficClass,
             InetAddress inetAddress, int port) throws IOException{
         connectStreamWithTimeoutSocket(fd, port, 0, trafficClass, inetAddress);
     }
-    // END android-changed
 
     public native void connectDatagram(FileDescriptor fd, int port,
             int trafficClass, InetAddress inetAddress) throws SocketException;
@@ -69,11 +57,9 @@
             int port, int timeout, int trafficClass, InetAddress inetAddress)
             throws IOException;
 
-    // BEGIN android-changed: changed context from Long to byte[]
     public native int connectWithTimeout(FileDescriptor fd, int timeout,
             int trafficClass, InetAddress inetAddress, int port, int step,
             byte[] context) throws IOException;
-    // END android-changed
 
     // TODO: preferIPv4Stack is ignored.
     public native void createDatagramSocket(FileDescriptor fd, boolean preferIPv4Stack)
@@ -89,26 +75,9 @@
 
     public native void disconnectDatagram(FileDescriptor fd) throws SocketException;
 
-    // TODO: rewrite callers to skip the middleman.
-    public InetAddress getHostByAddr(byte[] ipAddress) throws UnknownHostException {
-        // BEGIN android-changed
-        // Wallpaper fix for http://b/1851257. This  is a layering violation,
-        // but at least the method has the right return type.
-        // TODO: Fix the socket code to remove this method altogether.
-        return InetAddress.getByAddress(ipAddress);
-        // END android-changed
-    }
+    public native String byteArrayToIpString(byte[] address) throws UnknownHostException;
 
-    // TODO: rewrite callers to skip the middleman.
-    public InetAddress getHostByName(String hostName) throws UnknownHostException {
-        return InetAddress.getByName(hostName);
-    }
-
-    public native String byteArrayToIpString(byte[] address)
-            throws UnknownHostException;
-
-    public native byte[] ipStringToByteArray(String address)
-            throws UnknownHostException;
+    public native byte[] ipStringToByteArray(String address) throws UnknownHostException;
 
     public native InetAddress getSocketLocalAddress(FileDescriptor fd);
 
@@ -121,19 +90,17 @@
         return null;
     }
 
-    public native void listenStreamSocket(FileDescriptor fd, int backlog) throws SocketException;
+    public native void listen(FileDescriptor fd, int backlog) throws SocketException;
 
     public native int peekDatagram(FileDescriptor fd, InetAddress sender, int receiveTimeout)
             throws IOException;
 
     public int read(FileDescriptor fd, byte[] data, int offset, int count,
             int timeout) throws IOException {
-        // BEGIN android-added safety!
         if (offset < 0 || count < 0 || offset > data.length - count) {
             throw new IllegalArgumentException("data.length=" + data.length + " offset=" + offset +
                     " count=" + count);
         }
-        // END android-added
         return readSocketImpl(fd, data, offset, count, timeout);
     }
 
@@ -194,16 +161,12 @@
             return true;
         }
 
-        // BEGIN android-changed: handle errors in native code
         return selectImpl(readFDs, writeFDs, numReadable, numWritable, flags, timeout);
-        // END android-changed
     }
 
-    // BEGIN android-changed: return type (we throw in native code, with descriptive errors)
     static native boolean selectImpl(FileDescriptor[] readfd,
             FileDescriptor[] writefd, int cread, int cwirte, int[] flags,
             long timeout);
-    // END android-changed
 
     // TODO: bindToDevice is unused.
     public native int sendConnectedDatagram(FileDescriptor fd, byte[] data,
diff --git a/libcore/luni/src/main/native/org_apache_harmony_luni_platform_OSNetworkSystem.cpp b/libcore/luni/src/main/native/org_apache_harmony_luni_platform_OSNetworkSystem.cpp
index f38f29c..2344d14 100644
--- a/libcore/luni/src/main/native/org_apache_harmony_luni_platform_OSNetworkSystem.cpp
+++ b/libcore/luni/src/main/native/org_apache_harmony_luni_platform_OSNetworkSystem.cpp
@@ -1794,17 +1794,15 @@
     }
 }
 
-static void osNetworkSystem_listenStreamSocket(JNIEnv* env, jobject,
-        jobject fileDescriptor, jint backlog) {
-    int handle;
-    if (!jniGetFd(env, fileDescriptor, handle)) {
+static void osNetworkSystem_listen(JNIEnv* env, jobject, jobject fileDescriptor, jint backlog) {
+    int fd;
+    if (!jniGetFd(env, fileDescriptor, fd)) {
         return;
     }
 
-    int rc = listen(handle, backlog);
+    int rc = listen(fd, backlog);
     if (rc == -1) {
         jniThrowSocketException(env, errno);
-        return;
     }
 }
 
@@ -2853,7 +2851,7 @@
     { "getSocketLocalPort",                "(Ljava/io/FileDescriptor;)I",                                              (void*) osNetworkSystem_getSocketLocalPort },
     { "getSocketOption",                   "(Ljava/io/FileDescriptor;I)Ljava/lang/Object;",                            (void*) osNetworkSystem_getSocketOption },
     { "ipStringToByteArray",               "(Ljava/lang/String;)[B",                                                   (void*) osNetworkSystem_ipStringToByteArray },
-    { "listenStreamSocket",                "(Ljava/io/FileDescriptor;I)V",                                             (void*) osNetworkSystem_listenStreamSocket },
+    { "listen",                            "(Ljava/io/FileDescriptor;I)V",                                             (void*) osNetworkSystem_listen },
     { "peekDatagram",                      "(Ljava/io/FileDescriptor;Ljava/net/InetAddress;I)I",                       (void*) osNetworkSystem_peekDatagram },
     { "readDirect",                        "(Ljava/io/FileDescriptor;III)I",                                           (void*) osNetworkSystem_readDirect },
     { "readSocketImpl",                    "(Ljava/io/FileDescriptor;[BIII)I",                                         (void*) osNetworkSystem_readSocketImpl },