Add a close method to sockets

src/platform-macos.cc

Index: src/platform-macos.cc
===================================================================
--- src/platform-macos.cc	(revision 1531)
+++ src/platform-macos.cc	(working copy)
@@ -599,14 +599,8 @@
   }
   explicit MacOSSocket(int socket): socket_(socket) { }
 
+  virtual ~MacOSSocket() { Close(); }
 
-  virtual ~MacOSSocket() {
-    if (IsValid()) {
-      // Close socket.
-      close(socket_);
-    }
-  }
-
   // Server initialization.
   bool Bind(const int port);
   bool Listen(int backlog) const;
@@ -615,6 +609,9 @@
   // 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;
@@ -696,6 +693,17 @@
 }
 
 
+bool MacOSSocket::Close() {
+  if (IsValid()) {
+    // Close socket.
+    int status = close(socket_);
+    socket_ = -1;
+    return status == 0;
+  }
+  return true;
+}
+
+
 int MacOSSocket::Send(const char* data, int len) const {
   int status = send(socket_, data, len, 0);
   return status;