Changed GSocket_Select to use unix code for wxBase, previous code wasn't

detecting loss of connection.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18063 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/gsocket.c

@@ -712,22 +712,51 @@ GSocketEventFlags GSocket_Select(GSocket *socket, GSocketEventFlags flags)
   FD_SET(socket->m_fd, &writefds);
   FD_SET(socket->m_fd, &exceptfds);
 
-  /* Check known state first */
-  result |= (GSOCK_CONNECTION_FLAG & socket->m_detected & flags);
-  result |= (GSOCK_LOST_FLAG       & socket->m_detected & flags);
+  /* Check 'sticky' CONNECTION flag first */
+  result |= (GSOCK_CONNECTION_FLAG & socket->m_detected);
+
+  /* If we have already detected a LOST event, then don't try
+   * to do any further processing.
+   */
+  if ((socket->m_detected & GSOCK_LOST_FLAG) != 0)
+  {
+    socket->m_establishing = FALSE;
+
+    return (GSOCK_LOST_FLAG & flags);
+  }
 
   /* Try select now */
   if (select(socket->m_fd + 1, &readfds, &writefds, &exceptfds, &tv) <= 0)
-    return result;
+  {
+    /* What to do here? */
+    return (result & flags);
+  }
 
   /* Check for readability */
   if (FD_ISSET(socket->m_fd, &readfds))
   {
-    /* Assume that closure of the socket is always reported via exceptfds */
-    if (socket->m_server && socket->m_stream)
-      result |= (GSOCK_CONNECTION_FLAG & flags);
+    char c;
+
+    if (recv(socket->m_fd, &c, 1, MSG_PEEK) > 0)
+    {
+      result |= GSOCK_INPUT_FLAG;
+    }
     else
-      result |= (GSOCK_INPUT_FLAG & flags);
+    {
+      if (socket->m_server && socket->m_stream)
+      {
+        result |= GSOCK_CONNECTION_FLAG;
+        socket->m_detected |= GSOCK_CONNECTION_FLAG;
+      }
+      else
+      {
+        socket->m_detected = GSOCK_LOST_FLAG;
+        socket->m_establishing = FALSE;
+    
+        /* LOST event: Abort any further processing */
+        return (GSOCK_LOST_FLAG & flags);
+      }
+    }
   }
 
   /* Check for writability */
@@ -735,23 +764,43 @@ GSocketEventFlags GSocket_Select(GSocket *socket, GSocketEventFlags flags)
   {
     if (socket->m_establishing && !socket->m_server)
     {
-      result |= (GSOCK_CONNECTION_FLAG & flags);
+      int error;
+      SOCKLEN_T len = sizeof(error);
+
       socket->m_establishing = FALSE;
-      socket->m_detected |= GSOCK_CONNECTION_FLAG;
+
+      getsockopt(socket->m_fd, SOL_SOCKET, SO_ERROR, (void*)&error, &len);
+
+      if (error)
+      {
+        socket->m_detected = GSOCK_LOST_FLAG;
+
+        /* LOST event: Abort any further processing */
+        return (GSOCK_LOST_FLAG & flags);
       }
       else
-      result |= (GSOCK_OUTPUT_FLAG & flags);
+      {
+        result |= GSOCK_CONNECTION_FLAG;
+        socket->m_detected |= GSOCK_CONNECTION_FLAG;
+      }
+    }
+    else
+    {
+      result |= GSOCK_OUTPUT_FLAG;
+    }
   }
 
-  /* Check for exceptions and errors */
+  /* Check for exceptions and errors (is this useful in Unices?) */
   if (FD_ISSET(socket->m_fd, &exceptfds))
   {
-    result |= (GSOCK_LOST_FLAG & flags);
     socket->m_establishing = FALSE;
     socket->m_detected = GSOCK_LOST_FLAG;
+
+    /* LOST event: Abort any further processing */
+    return (GSOCK_LOST_FLAG & flags);
   }
 
-  return result;
+  return (result & flags);
 
 #else