shutdown sockets gracefully instead of doing it with TCP reset (patch 1682438) [backport from HEAD]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@44864 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -91,6 +91,10 @@ Major new features in 2.8 release
 2.8.3
 -----
 
+All:
+
+- Shut down the sockets gracefully (Sergio Aguayo)
+
 wxMac
 
 - Corrected top border size for wxStaticBox with empty label (nusi).

src/msw/gsocket.cpp

@@ -222,7 +222,7 @@ void GSocket::Shutdown()
   /* If socket has been created, shutdown it */
   if (m_fd != INVALID_SOCKET)
   {
-    shutdown(m_fd, 2);
+    shutdown(m_fd, 1 /* SD_SEND */);
     Close();
   }
 

src/unix/gsocket.cpp

@@ -587,7 +587,7 @@ void GSocket::Shutdown()
   /* If socket has been created, shutdown it */
   if (m_fd != INVALID_SOCKET)
   {
-    shutdown(m_fd, 2);
+    shutdown(m_fd, 1);
     Close();
   }