From 1481cd95c941e87fff8713a514ddc26700ce0b7d Mon Sep 17 00:00:00 2001
From: Michael Stapelberg <michael@stapelberg.de>
Date: Thu, 22 Sep 2011 22:08:42 +0100
Subject: [PATCH] Implement the I3_SYNC client protocol

This is mainly useful for the testsuite. The tests can wait until i3 processed
all X11 events and then continue. This eliminates sleep() calls which leads to
a more robust and faster testsuite.
---
 include/atoms.xmacro |  1 +
 src/handlers.c       | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/include/atoms.xmacro b/include/atoms.xmacro
index 7f83a7ee..309a3325 100644
--- a/include/atoms.xmacro
+++ b/include/atoms.xmacro
@@ -24,3 +24,4 @@ xmacro(WM_TAKE_FOCUS)
 xmacro(WM_WINDOW_ROLE)
 xmacro(I3_SOCKET_PATH)
 xmacro(I3_CONFIG_PATH)
+xmacro(I3_SYNC)
diff --git a/src/handlers.c b/src/handlers.c
index 267159ec..b3cb1df7 100644
--- a/src/handlers.c
+++ b/src/handlers.c
@@ -648,6 +648,25 @@ static int handle_client_message(xcb_client_message_event_t *event) {
 
         tree_render();
         x_push_changes(croot);
+    } else if (event->type == A_I3_SYNC) {
+        DLOG("i3 sync, yay\n");
+        xcb_window_t window = event->data.data32[0];
+        uint32_t rnd = event->data.data32[1];
+        DLOG("Sending random value %d back to X11 window 0x%08x\n", rnd, window);
+
+        void *reply = scalloc(32);
+        xcb_client_message_event_t *ev = reply;
+
+        ev->response_type = XCB_CLIENT_MESSAGE;
+        ev->window = window;
+        ev->type = A_I3_SYNC;
+        ev->format = 32;
+        ev->data.data32[0] = window;
+        ev->data.data32[1] = rnd;
+
+        xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
+        xcb_flush(conn);
+        free(reply);
     } else {
         ELOG("unhandled clientmessage\n");
         return 0;