Add a close method to sockets

src/platform-win32.cc

Index: src/platform-win32.cc
===================================================================
--- src/platform-win32.cc	(revision 1531)
+++ src/platform-win32.cc	(working copy)
@@ -1572,12 +1572,7 @@
   explicit Win32Socket(SOCKET socket): socket_(socket) { }
 
 
-  virtual ~Win32Socket() {
-    if (IsValid()) {
-      // Close socket.
-      closesocket(socket_);
-    }
-  }
+  virtual ~Win32Socket() { Close(); }
 
   // Server initialization.
   bool Bind(const int port);
@@ -1587,6 +1582,9 @@
   // Client initialization.
   bool Connect(const char* host, const char* port);
 
+  // Close.
+  bool Close();
+
   // Data Transimission
   int Send(const char* data, int len) const;
   int Receive(char* data, int len) const;
@@ -1662,6 +1660,17 @@
 }
 
 
+bool Win32Socket::Close() {
+  if (IsValid()) {
+    // Close socket.
+    int rc = closesocket(socket_);
+    socket_ = INVALID_SOCKET;
+    return rc != SOCKET_ERROR;
+  }
+  return true;
+}
+
+
 int Win32Socket::Send(const char* data, int len) const {
   int status = send(socket_, data, len, 0);
   return status;