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Fix unexpected devdraw crashes on sway

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I found sway 1.10 and wlroots 0.18.2 will occasionally generate
wl_keyboard::keymap events with an empty keymap. I do not have
a reliable reproduction for this, but it seems to occur when
switching back and forth between workspaces with the keyboard.

This also fixes the issue where devdraw can go into a busy loop if
the compositor goes away and wl_display_dispatch() returns -1.
This commit is contained in:
David Arroyo 2025-02-01 21:52:41 +01:00
parent 5636471dff
commit 3fdc76f128
1 changed files with 8 additions and 2 deletions
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10
src/cmd/devdraw/wayland.c
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@ -616,8 +616,13 @@ static const struct wl_pointer_listener pointer_listener = {
void wl_keyboard_keymap(void *data, struct wl_keyboard *wl_keyboard,
uint32_t format, int32_t fd, uint32_t size) {
DEBUG("wl_keyboard_keymap\n");
DEBUG("wl_keyboard_keymap(format=%d, fd=%d, size=%d)\n", format, fd, size);
char *keymap = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
if (keymap == MAP_FAILED) {
DEBUG("wl_keyboard_keymap: %s", strerror(errno));
return;
}
Client* c = data;
WaylandClient *wl = (WaylandClient*) c->view;
qlock(&wayland_lock);
@ -852,8 +857,9 @@ void gfx_main(void) {
entered_gfx_loop = 1;
gfx_started();
DEBUG("gfx_main: entering loop\n");
while (wl_display_dispatch(wl_display))
while (wl_display_dispatch(wl_display) > 0 || errno == EAGAIN)
;
sysfatal("wl_display_dispatch: %r");
}
static void rpc_resizeimg(Client*) {