Call WSAGetLastError() everywhere errno is read after a Winsock call.

Winsock does NOT update errno for us, we have fetch the last error
manually using WSAGetLastError().

libvncclient/sockets.c

@@ -262,6 +262,9 @@ WriteToRFBServer(rfbClient* client, char *buf, int n)
     j = write(client->sock, buf + i, (n - i));
     if (j <= 0) {
       if (j < 0) {
+#ifdef WIN32
+	 errno=WSAGetLastError();
+#endif
 	if (errno == EWOULDBLOCK ||
 #ifdef LIBVNCSERVER_ENOENT_WORKAROUND
 		errno == ENOENT ||
@@ -735,8 +738,12 @@ int WaitForMessage(rfbClient* client,unsigned int usecs)
   FD_SET(client->sock,&fds);
 
   num=select(client->sock+1, &fds, NULL, NULL, &timeout);
-  if(num<0)
+  if(num<0) {
+#ifdef WIN32
+    errno=WSAGetLastError();
+#endif
     rfbClientLog("Waiting for message failed: %d (%s)\n",errno,strerror(errno));
+  }
 
   return num;
 }

libvncclient/tls.c

@@ -62,6 +62,9 @@ PushTLS(gnutls_transport_ptr_t transport, const void *data, size_t len)
     ret = write(client->sock, data, len);
     if (ret < 0)
     {
+#ifdef WIN32
+      errno=WSAGetLastError();
+#endif
       if (errno == EINTR) continue;
       return -1;
     }
@@ -81,6 +84,9 @@ PullTLS(gnutls_transport_ptr_t transport, void *data, size_t len)
     ret = read(client->sock, data, len);
     if (ret < 0)
     {
+#ifdef WIN32
+      errno=WSAGetLastError();
+#endif
       if (errno == EINTR) continue;
       return -1;
     }

libvncserver/httpd.c

@@ -269,6 +269,9 @@ httpProcessInput(rfbScreenInfoPtr rfbScreen)
 	    if (got == 0) {
 		rfbErr("httpd: premature connection close\n");
 	    } else {
+#ifdef WIN32
+	        errno=WSAGetLastError();
+#endif
 		if (errno == EAGAIN) {
 		    return;
 		}

libvncserver/rfbserver.c

@@ -1350,6 +1350,9 @@ rfbBool rfbSendFileTransferChunk(rfbClientPtr cl)
 	n = select(cl->sock + 1, NULL, &wfds, NULL, &tv);
 
 	if (n<0) {
+#ifdef WIN32
+	    errno=WSAGetLastError();
+#endif
             rfbLog("rfbSendFileTransferChunk() select failed: %s\n", strerror(errno));
 	}
         /* We have space on the transmit queue */
@@ -1369,6 +1372,9 @@ rfbBool rfbSendFileTransferChunk(rfbClientPtr cl)
                 return retval;
             case -1:
                 /* TODO : send an error msg to the client... */
+#ifdef WIN32
+	        errno=WSAGetLastError();
+#endif
                 rfbLog("rfbSendFileTransferChunk(): %s\n",strerror(errno));
                 retval = rfbSendFileTransferMessage(cl, rfbAbortFileTransfer, 0, 0, 0, NULL);
                 close(cl->fileTransfer.fd);

libvncserver/sockets.c

@@ -567,6 +567,9 @@ rfbWriteExact(rfbClientPtr cl,
             tv.tv_usec = 0;
             n = select(sock+1, NULL, &fds, NULL /* &fds */, &tv);
 	    if (n < 0) {
+#ifdef WIN32
+                errno=WSAGetLastError();
+#endif
        	        if(errno==EINTR)
 		    continue;
                 rfbLogPerror("WriteExact: select");