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desktop/surface: Fix crash when timer is NULL

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When many surfaces are created, sway can run out of file descriptors,
making wl_event_loop_add_timer (which creates a timerfd) fail and
return NULL. This patch posts a "no memory" error when that is the case,
and only removes the timer if it was created.

(Why "no memory"? It is not easy to distinguish between failures due to
running out of memory and failures due to running out of file
descriptors. Also, using the newer `wl_client_post_implementation_error`
function would lead to an increased version requirement for the
libwayland-server dependency.)
This commit is contained in:
Manuel Stoeckl 2019-12-23 19:17:06 -05:00 committed by Simon Ser
parent aa8fe58421
commit 1d483c340d
1 changed files with 6 additions and 1 deletions
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5
sway/desktop/surface.c
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@ -11,7 +11,9 @@ void handle_destroy(struct wl_listener *listener, void *data) {
surface->wlr_surface->data = NULL;
wl_list_remove(&surface->destroy.link);
if (surface->frame_done_timer) {
wl_event_source_remove(surface->frame_done_timer);
}
free(surface);
}
@ -38,4 +40,7 @@ void handle_compositor_new_surface(struct wl_listener *listener, void *data) {
surface->frame_done_timer = wl_event_loop_add_timer(server.wl_event_loop,
surface_frame_done_timer_handler, surface);
if (!surface->frame_done_timer) {
wl_resource_post_no_memory(wlr_surface->resource);
}
}