Calling maybe_send_keepalive() for protocol_version < 29 is

now supported, though we can only try to flush the output
buffer if we're in a lull.

diff --git a/io.c b/io.c
index 7d44962..035362e 100644 (file)
--- a/io.c
+++ b/io.c
@@ -639,6 +639,8 @@ void maybe_send_keepalive(int allowed_lull, int ndx)
 {
        if (time(NULL) - last_io >= allowed_lull) {
                if (!iobuf_out || !iobuf_out_cnt) {
+                       if (protocol_version < 29)
+                               return; /* there's nothing we can do */
                        write_int(sock_f_out, ndx);
                        write_shortint(sock_f_out, ITEM_IS_NEW);
                }