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Remove selection requests on the keyboard buffer when closing display

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* src/xterm.c (X_NEXT_KBD_EVENT): New macro.
(x_defer_selection_requests): Set input_pending if the kbd
buffer was modified.
(x_delete_selection_requests): New function.
(x_delete_display): Call that.  Bug found when a display died
while the clipboard manager was sending an unreasonably high
number of requests.
This commit is contained in:
Po Lu 2022-06-21 09:52:47 +08:00
parent 32a6d52d43
commit 01834ba0c9
1 changed files with 55 additions and 4 deletions
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59
src/xterm.c
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@ -802,6 +802,10 @@ static struct input_event *current_hold_quit;
than 0. */
static int x_use_pending_selection_requests;
/* Like `next_kbd_event', but for use in X code. */
#define X_NEXT_KBD_EVENT(ptr) \
((ptr) == kbd_buffer + KBD_BUFFER_SIZE - 1 ? kbd_buffer : (ptr) + 1)
static void x_push_selection_request (struct selection_input_event *);
/* Defer selection requests. Between this and
@ -838,14 +842,12 @@ x_defer_selection_requests (void)
avoids exhausting the keyboard buffer with some
over-enthusiastic clipboard managers. */
if (!between)
kbd_fetch_ptr = (event == kbd_buffer + KBD_BUFFER_SIZE - 1
? kbd_buffer : event + 1);
kbd_fetch_ptr = X_NEXT_KBD_EVENT (event);
}
else
between = true;
event = (event == kbd_buffer + KBD_BUFFER_SIZE - 1
? kbd_buffer : event + 1);
event = X_NEXT_KBD_EVENT (event);
}
}
@ -26969,7 +26971,54 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
return dpyinfo;
}
/* Remove all the selection input events on the keyboard buffer
intended for DPYINFO. */
static void
x_delete_selection_requests (struct x_display_info *dpyinfo)
{
union buffered_input_event *event;
int moved_events;
for (event = kbd_fetch_ptr; event != kbd_store_ptr;
event = X_NEXT_KBD_EVENT (event))
{
if (event->kind == SELECTION_REQUEST_EVENT
|| event->kind == SELECTION_CLEAR_EVENT)
{
if (SELECTION_EVENT_DPYINFO (&event->sie) != dpyinfo)
continue;
/* Remove the event from the fifo buffer before processing;
otherwise swallow_events called recursively could see it
and process it again. To do this, we move the events
between kbd_fetch_ptr and EVENT one slot to the right,
cyclically. */
if (event < kbd_fetch_ptr)
{
memmove (kbd_buffer + 1, kbd_buffer,
(event - kbd_buffer) * sizeof *kbd_buffer);
kbd_buffer[0] = kbd_buffer[KBD_BUFFER_SIZE - 1];
moved_events = kbd_buffer + KBD_BUFFER_SIZE - 1 - kbd_fetch_ptr;
}
else
moved_events = event - kbd_fetch_ptr;
memmove (kbd_fetch_ptr + 1, kbd_fetch_ptr,
moved_events * sizeof *kbd_fetch_ptr);
kbd_fetch_ptr = X_NEXT_KBD_EVENT (kbd_fetch_ptr);
/* `detect_input_pending' will then recompute whether or not
pending input events exist. */
input_pending = false;
}
}
}
/* Get rid of display DPYINFO, deleting all frames on it,
and without sending any more commands to the X server. */
@ -27019,6 +27068,8 @@ x_delete_display (struct x_display_info *dpyinfo)
last = ie;
}
x_delete_selection_requests (dpyinfo);
if (next_noop_dpyinfo == dpyinfo)
next_noop_dpyinfo = dpyinfo->next;