page-xfer: wait when a connection will be closed from a client side

In this case a time wait bucket will be created on a client side,
where a port is allocated dinamically.

Reported-by: Mr Jenkins
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

page-xfer.c

@@ -257,6 +257,20 @@ static int page_server_serve(int sk)
 		ret = -1;
 	}
 
+	if (ret == 0) {
+		char c;
+
+		/*
+		 * Wait when a remote side closes the connection
+		 * to avoid TIME_WAIT bucket
+		 */
+
+		if (read(sk, &c, sizeof(c)) != 0) {
+			pr_perror("Unexpected data");
+			ret = -1;
+		}
+	}
+
 	page_server_close();
 	pr_info("Session over\n");