Commit 3aff7839 authored by Jakub Janků's avatar Jakub Janků Committed by Victor Toso

x11: invalidate requests for targets on grab from client

If XSetSelectionOwner() is invoked during the time
we are waiting for the requested clipboard targets,
the targets we eventually receive are no longer valid.

To solve this, ignore the same count of target notifications
as we expected at the time we received grab from the client.

Otherwise we end up in a situation when vdagent holds
the clipboard grab in the guest but cannot provide data to the
apps that request it - this can be observed in the log:

    clipboard: received selection request event for target *, while not owning client clipboard
Signed-off-by: Jakub Janků's avatarJakub Janků <>
Acked-by: Victor Toso's avatarVictor Toso <>
parent 783ceece
Pipeline #21136 passed with stage
in 9 minutes and 28 seconds
......@@ -92,6 +92,7 @@ struct vdagent_x11 {
int xfixes_event_base;
int max_prop_size;
int expected_targets_notifies[256];
int ignore_targets_notifies[256];
int clipboard_owner[256];
int clipboard_type_count[256];
uint32_t clipboard_agent_types[256][256];
......@@ -945,6 +945,12 @@ static void vdagent_x11_handle_targets_notify(struct vdagent_x11 *x11,
if (x11->ignore_targets_notifies[selection] > 0) {
VSELPRINTF("ignoring selection notify TARGETS");
/* If we have more targets_notifies pending, ignore this one, we
are only interested in the targets list of the current owner
(which is the last one we've requested a targets list from) */
......@@ -1246,6 +1252,11 @@ void vdagent_x11_clipboard_grab(struct vdagent_x11 *x11, uint8_t selection,
x11->selection_window, CurrentTime);
vdagent_x11_set_clipboard_owner(x11, selection, owner_client);
/* If there're pending requests for targets, ignore the returned
* targets as the XSetSelectionOwner() call above made them invalid */
x11->ignore_targets_notifies[selection] =
/* Flush output buffers and consume any pending events */
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment