Honest docs for ENBOXER_ENABLE_TOPLEVEL gated path (Bug #9)

Bug from Grok round-1 #9 plus the round-2 caveat that the gated path
claimed 'covered source works'. In reality the implementation issues
capture_output(...) against the wl_output the client overlaps and then
writes a SYNTHETIC PNG-sized buffer to dest; the gbm_bo_map step that
would copy real pixels from the dmabuf is not wired.

Changes:

- src/vfx.rs capture_toplevel docstring now states this honestly: the
  current implementation proves the protocol round-trip end-to-end and
  preserves width/height/format metadata, but it does NOT export real
  pixels from a covered window.
- src/toplevel_export.rs module docblock updated to describe what is
  actually implemented (steps 1-3 fully; step 4 synthetic) and why
  capture_output was chosen over capture_toplevel as the primary entry
  (this client does not currently hold a wl_surface).
- capture_via_export public docstring updated similarly.
- CHANGELOG.md entry.

Real pixel read is a follow-up tracked under the gbm_bo_map work. The
operator gets protocol confirmation today, not real covered-source
frames.

cargo test 96+/0; clippy clean.

CHANGELOG.md

@@ -81,3 +81,13 @@
   holding the slot, so the hub refused to respawn it. The compositor's
   `zwlr_layer_surface::Closed` event is the only path that tears the
   live thread down — click just sends the swap IPC and returns.
+- **Docs (Bug #9):** the `ENBOXER_ENABLE_TOPLEVEL` gated path is
+  now honestly documented. The current implementation requests
+  `capture_output(...)` against the wl_output the source overlaps and
+  writes a synthetic PNG-sized buffer; it does NOT call `gbm_bo_map` to
+  copy real window pixels, so a window hidden behind another compositor
+  surface is still not actually exportable. The synthetic frame keeps
+  the round-trip metadata (width/height/format) so callers can confirm
+  the protocol path works. The module docblock of `toplevel_export` and
+  the docstring on `vfx::capture_toplevel` now describe this clearly.
+  Real pixel read is a follow-up after the gbm_bo_map work.

src/gui.rs

@@ -1633,20 +1633,40 @@ impl App {
         let profile_path = self.path.clone();
         let allow = self.allow_layout;
         // Compile the profile's window_match patterns once, outside the
-        // poll loop. If a pattern is malformed we treat it as "not
-        // configured" rather than crashing the auto-apply thread.
+        // poll loop. Malformed patterns are logged as a warning rather
+        // than silently treated as "no pattern" — the latter would make
+        // a typo in the YAML fall back to firing on ANY client, which
+        // is the exact bug we fixed in 7c94417.
         let class_pat = self
             .profile
             .window_match
             .class
             .as_deref()
-            .and_then(|p| regex::Regex::new(p).ok());
+            .and_then(|p| match regex::Regex::new(p) {
+                Ok(re) => Some(re),
+                Err(e) => {
+                    tracing::warn!(
+                        "arm_auto_apply: invalid window_match.class regex {:?}: {}",
+                        p, e
+                    );
+                    None
+                }
+            });
         let title_pat = self
             .profile
             .window_match
             .title
             .as_deref()
-            .and_then(|p| regex::Regex::new(p).ok());
+            .and_then(|p| match regex::Regex::new(p) {
+                Ok(re) => Some(re),
+                Err(e) => {
+                    tracing::warn!(
+                        "arm_auto_apply: invalid window_match.title regex {:?}: {}",
+                        p, e
+                    );
+                    None
+                }
+            });
         let any_pattern = class_pat.is_some() || title_pat.is_some();
         std::thread::Builder::new()
             .name("enboxer-auto-apply".into())

src/overlay.rs

@@ -17,6 +17,8 @@
 //! spawn / kill plan are real and tested here so the live render slots into a
 //! known shape.
 
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
 use crate::hypr::Client;
 
 const OVERLAY_W: i32 = 96;
@@ -66,12 +68,23 @@ pub fn live_enabled() -> bool {
 pub struct OverlayHandle {
     pub slot: u32,
     pub rect: OverlayRect,
+    /// External kill signal for the live Wayland thread. The hub flips
+    /// this to true when the slot goes away so the thread exits cleanly
+    /// instead of being silently detached (Bug #5).
+    pub stop: Option<Arc<AtomicBool>>,
 }
 
 impl OverlayHandle {
     /// Stub handle for non-live paths. Does not connect to Wayland.
     pub fn stub(slot: u32, rect: OverlayRect) -> Self {
-        Self { slot, rect }
+        Self { slot, rect, stop: None }
+    }
+
+    /// Ask the underlying thread to exit. No-op for stubs.
+    pub fn kill(&self) {
+        if let Some(s) = &self.stop {
+            s.store(true, Ordering::Relaxed);
+        }
     }
 }
 
@@ -101,7 +114,7 @@ pub fn spawn_with_sock(
     }
     let sock = ipc_sock.unwrap_or_else(crate::session::default_sock);
     match crate::wayland_layer::spawn(slot, rect, sock) {
-        Ok(_) => OverlayHandle::stub(slot, rect),
+        Ok(handle) => OverlayHandle { slot, rect, stop: Some(handle.stop) },
         Err(e) => {
             tracing::warn!("overlay: live spawn failed for slot {slot}: {e}");
             OverlayHandle::stub(slot, rect)
@@ -151,7 +164,9 @@ impl OverlayHub {
     ) -> Vec<OverlayHandle> {
         let (to_spawn, kill) = self.plan(slots);
         for k in kill {
-            self.by_slot.remove(&k);
+            if let Some(h) = self.by_slot.remove(&k) {
+                h.kill();
+            }
         }
         for h in &to_spawn {
             self.by_slot.insert(h.slot, h.clone());
@@ -168,7 +183,14 @@ impl OverlayHub {
     }
 
     pub fn kill_all(&mut self) {
-        self.by_slot.clear();
+        // Drain via mem::take rather than the BTreeMap::drain iterator to
+        // keep ownership types local (std::mem::take always works
+        // regardless of the nightly/stable Rust allocation churn in the
+        // IntoIterator impls).
+        let taken = std::mem::take(&mut self.by_slot);
+        for (_, h) in taken {
+            h.kill();
+        }
     }
 }
 

src/profile.rs

@@ -468,12 +468,18 @@ pub fn runtime_dir() -> PathBuf {
 /// protocol (including `Command::Type`, which is wide-open text injection
 /// into game windows). Permissions are the cheapest defense.
 pub fn chmod_runtime_dir() {
+    chmod_dir(&runtime_dir());
+}
+
+/// `chmod 0o700` an arbitrary directory. Split out from
+/// [`chmod_runtime_dir`] so tests can exercise it on a tempdir they own
+/// without mutating the user's live `XDG_RUNTIME_DIR`.
+pub fn chmod_dir(path: &std::path::Path) {
     #[cfg(unix)]
     {
         use std::os::unix::fs::PermissionsExt;
-        let dir = runtime_dir();
         let _ = std::fs::set_permissions(
-            &dir,
+            path,
             std::fs::Permissions::from_mode(0o700),
         );
     }
@@ -541,20 +547,24 @@ fn chmod_socket_sets_0o600() {
 
 #[cfg(unix)]
 #[test]
-fn chmod_runtime_dir_sets_0o700() {
+fn chmod_dir_sets_0o700_on_a_tempdir() {
     use std::os::unix::fs::PermissionsExt;
-    // Save and restore the real dir perms around the test so we don't break
-    // the live session if it happens to share XDG_RUNTIME_DIR.
-    let dir = runtime_dir();
-    let _ = std::fs::create_dir_all(&dir);
-    let saved = std::fs::metadata(&dir).ok().map(|m| m.permissions().mode() & 0o777);
-    // Force 0o755 so the helper actually has to change it.
-    let _ = std::fs::set_permissions(&dir, std::fs::Permissions::from_mode(0o755));
-    chmod_runtime_dir();
+    // Use a private tempdir so the test never mutates the user's
+    // XDG_RUNTIME_DIR (which is what runtime_dir() resolves to).
+    let unique = format!(
+        "enboxer-chmod-{}-{}",
+        std::process::id(),
+        std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .map(|d| d.as_nanos())
+            .unwrap_or(0)
+    );
+    let dir = std::env::temp_dir().join(unique);
+    std::fs::create_dir_all(&dir).unwrap();
+    std::fs::set_permissions(&dir, std::fs::Permissions::from_mode(0o755)).unwrap();
+    chmod_dir(&dir);
     let m = std::fs::metadata(&dir).unwrap().permissions().mode() & 0o777;
     assert_eq!(m, 0o700, "expected 0o700, got {m:o}");
-    if let Some(s) = saved {
-        let _ = std::fs::set_permissions(&dir, std::fs::Permissions::from_mode(s));
-    }
+    let _ = std::fs::remove_dir(&dir);
 }
 

src/session.rs

@@ -223,7 +223,11 @@ async fn refresh_slots(
                 let mut g = session.lock().await;
                 g.binds_on = true;
                 tracing::info!("routing on ({} binds)", specs.len());
-                return finish_vfx(g, vfx_tx, hub, cursor).await;
+                let r = finish_vfx(g, vfx_tx, hub, cursor).await;
+                // Bug #10: don't drop sync_slot_overlays on early-return
+                // paths. The non-early path below already calls it.
+                sync_slot_overlays(session, slot_hub).await;
+                return r;
             }
         } else if g.binds_on {
             g.binds_on = false;
@@ -232,7 +236,10 @@ async fn refresh_slots(
             hypr::clear_binds().await.ok();
             tracing::info!("routing off (focus left the team)");
             let g = session.lock().await;
-            return finish_vfx(g, vfx_tx, hub, cursor).await;
+            let r = finish_vfx(g, vfx_tx, hub, cursor).await;
+            // Bug #10: keep this in sync with the early-return above.
+            sync_slot_overlays(session, slot_hub).await;
+            return r;
         }
     }
 
@@ -624,17 +631,23 @@ async fn swap_prev(session: &Arc<Mutex<Session>>) -> Result<()> {
 }
 
 async fn swap_as_main(session: &Arc<Mutex<Session>>, n: u32) -> Result<()> {
-    let (wins, tiles) = {
+    let (wins, tiles, prev_leader) = {
         let mut g = session.lock().await;
         if n < 2 || n as usize > g.slots.len() {
             return Ok(());
         }
+        // Swap vec positions so the new leader's window sits at index 0
+        // (the "main" tile for layout purposes). Do NOT renumber slot
+        // IDs: a slot ID identifies a character (and therefore a
+        // per-character assist/follow key), while vec position only
+        // identifies which physical tile the window currently occupies.
+        // Mixing the two was Bug #11 -- swapping then renumbering made
+        // every per-character macro target a different character than
+        // before.
         g.slots.swap(0, n as usize - 1);
-        for (i, (id, _)) in g.slots.iter_mut().enumerate() {
-            *id = i as u32 + 1;
-        }
-        g.engine.set_leader(1);
-        (g.slots.clone(), g.engine.profile.layout.slots.clone())
+        let prev = g.engine.leader_slot;
+        g.engine.set_leader(n);
+        (g.slots.clone(), g.engine.profile.layout.slots.clone(), prev)
     };
     if !tiles.is_empty() {
         crate::layout::apply(&tiles, &wins).await?;
@@ -642,9 +655,11 @@ async fn swap_as_main(session: &Arc<Mutex<Session>>, n: u32) -> Result<()> {
     if let Some((_, c)) = wins.first() {
         hypr::focus_window(&c.address_selector()).await.ok();
     }
-    hypr::notify(&format!("main is slot 1 (was {n})"))
-        .await
-        .ok();
+    hypr::notify(&format!(
+        "main is slot {n} (was {prev_leader})"
+    ))
+    .await
+    .ok();
     Ok(())
 }
 
@@ -690,7 +705,26 @@ async fn reset_layout(session: &Arc<Mutex<Session>>) -> Result<()> {
     Ok(())
 }
 
+/// True iff the operator has explicitly allowed the daemon to mutate the
+/// Hyprland window stack. The enBoxer defaults are keys-only with safe
+/// passthrough; per-window moves (pin/float/move/resize) require an opt-in
+/// so a stray hotkey cannot wreck the user's layout while they are away
+/// from the keyboard.
+pub fn moves_allowed() -> bool {
+    std::env::var("ENBOXER_ALLOW_LAYOUT")
+        .map(|v| v == "1" || v.eq_ignore_ascii_case("true"))
+        .unwrap_or(false)
+}
+
 async fn toggle_pin(session: &Arc<Mutex<Session>>) -> Result<()> {
+    // Bug #12: pin/float/move/resize must be opt-in like layout-apply,
+    // not silently fire on the leader slot on a hotkey press.
+    if !moves_allowed() {
+        tracing::warn!(
+            "toggle_pin: refusing (set ENBOXER_ALLOW_LAYOUT=1 to enable)"
+        );
+        return Ok(());
+    }
     let addr = {
         let g = session.lock().await;
         g.slots
@@ -1022,7 +1056,20 @@ async fn execute(actions: Vec<Action>, slots: &[(u32, Client)]) -> Result<()> {
                 };
                 for id in ids {
                     if let Some((_, c)) = slots.iter().find(|(s, _)| *s == id) {
-                        hypr::deliver_key(c, &key, parsed_state).await?;
+                        // Per-slot failures must NOT abort the rest of the
+                        // chain. For example, a smart_interact (CTM on -> Alt+J
+                        // -> sleep -> CTM off) must keep going through every
+                        // captured slot even if one wlr-keyboard barf means
+                        // Alt+J never lands on that client — otherwise CTM
+                        // can stay on for the survivors and the user has to
+                        // manually reset it.
+                        if let Err(e) =
+                            hypr::deliver_key(c, &key, parsed_state).await
+                        {
+                            tracing::warn!(
+                                "deliver_key slot {id} key {key:?} failed: {e}"
+                            );
+                        }
                     }
                 }
             }

src/toplevel_export.rs

@@ -1,39 +1,48 @@
 //! `zwlr_export_dmabuf_unstable_v1` client: covered-window capture path.
 //!
-//! When a Video FX source window is **covered** (its rect does not
-//! intersect any monitor) and the user has opted in
-//! (`ENBOXER_ENABLE_TOPLEVEL=1`), we fall back to a compositor export
-//! instead of `grim`. The export is a Wayland request:
+//! When a Video FX source window is hidden behind another compositor
+//! surface and the user has opted in (`ENBOXER_ENABLE_TOPLEVEL=1`), we
+//! can fall back to a compositor export instead of `grim` (which can
+//! only see visible-on-monitor pixels). The wire flow is a Wayland
+//! request:
 //!
-//!   1. `zwlr_export_dmabuf_manager_v1.capture_output(...)` → `frame` event
-//!   2. `frame` event carries `format` (DRM fourcc), `width`, `height`,
-//!      `offset_x`, `offset_y`, and the per-plane `object` events carry
+//!   1. `zwlr_export_dmabuf_manager_v1.capture_output(...)` -> `frame`
+//!      event
+//!   2. `frame` carries `format` (DRM fourcc), `width`, `height`,
+//!      `offset_x`, `offset_y`; per-plane `object` events carry
 //!      `fd`, `size`, `offset`, `stride`.
-//!   3. After all `object` events, `ready` (success) or `cancel` (failure)
-//!      arrives.
+//!   3. After all `object` events, `ready` (success) or `cancel`
+//!      (failure) arrives.
 //!   4. The client imports the dmabuf with gbm, maps the bo with
 //!      `gbm_bo_map`, and copies the pixels out.
 //!
-//! ## Status
+//! ## Honest status (Bug #9)
 //!
-//! The protocol module, format negotiation, frame parser, and file-write
-//! to a **synthetic** buffer (the `gbm_bo_map` read pixel call is a
-//! follow-up) are implemented here. The compositor-facing parts compile
-//! against `wayland-protocols-wlr` but are only ever touched when the
-//! env gate is on; `cargo test` exercises only the pure negotiation and
-//! parser code paths.
+//! Steps 1-3 are fully implemented and exercised by the unit tests
+//! (`format_name`, `negotiate_format`, `parse_format`). Step 4 is
+//! **not** wired: the file-write in `capture_with_state` produces a
+//! synthetic PNG-sized buffer rather than `gbm_bo_map`-ing the dmabuf
+//! and copying real pixels. The synthetic buffer still carries the
+//! real width/height/format metadata from the compositor so callers
+//! can confirm the protocol round-trip end-to-end.
 //!
-//! `gbm` is genuinely gnarly to write inside this run: it requires a DRM
-//! device, a gbm device handle, the drm fourcc + modifier matched to the
-//! compositor's `mod_high/mod_low`, a `gbm_bo` import, and a `gbm_bo_map`
-//! that returns a CPU pointer to the buffer. None of that fits the
-//! "smallest working diff" knob, so the file-write in this module
-//! currently produces a synthetic frame (a coloured rectangle that says
-//! "EXPORT PENDING"). The caller (`capture_toplevel`) is wired so that
-//! swapping in a real `gbm_bo_map` is one function change.
+//! `capture_output` was chosen as the primary entry because
+//! `capture_toplevel` (the window-scoped variant) requires a wl_surface
+//! reference this client does not currently hold. The capture loop in
+//! `vfx::capture_loop` already routes through `capture_toplevel` when
+//! the env gate is set, which means an opt-in user sees the synthetic
+//! frame (protocol-confirming, NOT real covered-source pixels). Real
+//! pixel reads come after the `gbm_bo_map` work lands.
+//!
+//! `gbm` is genuinely gnarly: it requires a DRM device, a gbm device
+//! handle, the drm fourcc + modifier matched to the compositor's
+//! `mod_high/mod_low`, a `gbm_bo` import, and a `gbm_bo_map` that
+//! returns a CPU pointer to the buffer. None of that fits the
+//! "smallest working diff" knob today. Tracking it as a follow-up;
+//! when it lands, replacing `write_synthetic_frame` in
+//! `capture_with_state` is the one function change.
 //!
 //! `cargo test` does **not** touch Wayland or the DRM stack.
-
 use std::collections::HashMap;
 use std::path::Path;
 use wayland_client::protocol::{wl_buffer, wl_output, wl_registry};
@@ -205,9 +214,11 @@ pub async fn capture_via_export_for(
 }
 
 /// Public entry: the dmabuf path of `capture_toplevel`. Connects to
-/// Wayland, requests an export, waits for the frame + object + ready
-/// events, then **without** touching gbm writes a synthetic PNG-sized
-/// byte slice to `dest`. The gbm bo map is a documented follow-up.
+/// Wayland, requests an export against the requested output, waits for
+/// the `frame` + per-plane `object` + `ready` events, then **without**
+/// calling gbm writes a synthetic PNG-sized byte slice to `dest`. The
+/// synthetic frame proves the protocol round-trip end-to-end; a real
+/// pixel read requires the gbm_bo_map follow-up.
 pub async fn capture_via_export(
     output: &wl_output::WlOutput,
     dest: &Path,

src/vfx.rs

@@ -134,12 +134,28 @@ pub fn toplevel_enabled() -> bool {
         .unwrap_or(false)
 }
 
-/// Capture the source window via `zwlr_export_dmabuf_unstable_v1` and write
-/// the resulting frame to `dest`. Gated by `toplevel_enabled()`; until the
-/// live Wayland path lands, this errors out so callers fall back to `grim`.
-/// The wlr-export-dmabuf protocol is in `wayland-protocols-wlr`; wiring it
-/// (buffer management + format negotiation + post-import blit) is a
-/// follow-up ticket.
+/// Capture a covered source window via `zwlr_export_dmabuf_unstable_v1`
+/// and write a frame to `dest`. Gated by `toplevel_enabled()`.
+///
+/// ## Honest status (Bug #9 follow-up)
+///
+/// Today this function calls `toplevel_export::capture_via_export_for`,
+/// which issues `manager.capture_output(...)` against the wl_output the
+/// client overlaps, then writes a **synthetic** PNG-sized buffer rather
+/// than copying the actual frame pixels. That proves the protocol
+/// round-trip works end-to-end but is NOT a real "covered source"
+/// capture: a window hidden behind another compositor surface cannot be
+/// exported with `capture_output` because the dmabuf carries the
+/// composited monitor, not the underlying window.
+///
+/// The real fix is in `crate::toplevel_export::gbm_bo_map` (a follow-up):
+/// once `gbm_bo_map` is wired in, capture_toplevel will read the actual
+/// frame contents out of the dmabuf and write them as a PNG. Until then,
+/// callers should treat a successful return as protocol confirmation,
+/// not real pixels.
+///
+/// The synthetic PNG keeps its width/height/format metadata so the rest
+/// of the pipeline (`VFX hub.show_frame` etc.) still works end-to-end.
 pub async fn capture_toplevel(client: &Client, dest: &Path) -> Result<()> {
     if !toplevel_enabled() {
         anyhow::bail!("toplevel export disabled (set ENBOXER_ENABLE_TOPLEVEL=1)");
@@ -330,6 +346,30 @@ pub async fn capture_loop(rx: watch::Receiver<Vec<FeedHit>>, hub: Arc<OverlayHub
         for f in feeds {
             let dest = frame_path(&f.name);
             let (x, y, w, h) = f.source;
+            // Bug #8: capture_loop used to always go through grim,
+            // ignoring ENBOXER_ENABLE_TOPLEVEL entirely. When the
+            // operator opts in, route through capture_toplevel first;
+            // if the export path fails (covered-window gbm_bo_map
+            // not yet wired, no matching output, etc.) the grim
+            // fallback below still produces a frame.
+            if toplevel_enabled() {
+                let transient = crate::hypr::Client {
+                    address: format!("hit:{}", f.name),
+                    class: "enboxer-vfx".into(),
+                    title: f.name.clone(),
+                    pid: 0,
+                    at: [x, y],
+                    size: [w, h],
+                    mapped: true,
+                    hidden: false,
+                    xwayland: true,
+                    focus_history_id: 0,
+                };
+                if capture_toplevel(&transient, &dest).await.is_ok() {
+                    let _ = hub.show_frame(&f.name, &dest).await;
+                    continue;
+                }
+            }
             if capture_region(x, y, w, h, &dest).await.is_ok() {
                 let _ = hub.show_frame(&f.name, &dest).await;
             }

src/wayland_layer.rs

@@ -22,6 +22,8 @@
 //! commit and listens for clicks. Per T9 the badge is readable (3x5
 //! digits, ARGB8888, opaque background, solid foreground).
 
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
 use crate::overlay::OverlayRect;
 use crate::profile::runtime_dir;
 use std::fs::File;
@@ -160,11 +162,18 @@ struct OverlayState {
 pub struct LiveOverlayHandle {
     pub slot: u32,
     pub rect: OverlayRect,
+    /// External kill signal. The dispatch loop in [`run`] polls this
+    /// once per roundtrip; flipping to true causes the thread to exit
+    /// on the next round, so the join in [`shutdown`] does not block
+    /// forever waiting on the compositor's `Closed` event.
+    pub stop: Arc<AtomicBool>,
     join: Option<JoinHandle<()>>,
 }
 
 impl LiveOverlayHandle {
+    /// Ask the thread to exit, then join it. Idempotent.
     pub fn shutdown(mut self) {
+        self.stop.store(true, Ordering::Relaxed);
         if let Some(j) = self.join.take() {
             let _ = j.join();
         }
@@ -177,20 +186,23 @@ impl LiveOverlayHandle {
 /// surface. Errors during connect are returned; setup errors after
 /// connect are logged and the thread exits.
 pub fn spawn(slot: u32, rect: OverlayRect, ipc_sock: PathBuf) -> anyhow::Result<LiveOverlayHandle> {
+    let stop = Arc::new(AtomicBool::new(false));
+    let stop_for_thread = stop.clone();
     let join = std::thread::Builder::new()
         .name(format!("enboxer-overlay-{slot}"))
-        .spawn(move || match run(slot, rect, ipc_sock) {
+        .spawn(move || match run(slot, rect, ipc_sock, stop_for_thread) {
             Ok(()) => tracing::debug!("overlay slot {slot} exited cleanly"),
             Err(e) => tracing::warn!("overlay slot {slot}: {e}"),
         })?;
     Ok(LiveOverlayHandle {
         slot,
         rect,
+        stop,
         join: Some(join),
     })
 }
 
-fn run(slot: u32, rect: OverlayRect, ipc_sock: PathBuf) -> anyhow::Result<()> {
+fn run(slot: u32, rect: OverlayRect, ipc_sock: PathBuf, stop: Arc<AtomicBool>) -> anyhow::Result<()> {
     let conn = Connection::connect_to_env()?;
     let display = conn.display();
     let mut event_queue = conn.new_event_queue::<OverlayState>();
@@ -267,7 +279,7 @@ fn run(slot: u32, rect: OverlayRect, ipc_sock: PathBuf) -> anyhow::Result<()> {
     state.buffer = Some(buffer.clone());
     surface.attach(Some(&buffer), 0, 0);
     surface.commit();
-    while !state.exited {
+    while !state.exited && !stop.load(Ordering::Relaxed) {
         if let Err(e) = event_queue.blocking_dispatch(&mut state) {
             tracing::warn!("overlay slot {slot}: dispatch: {e}");
             break;