React to more shutdown signals (#77)

* React to more shutdown signals on windows

.github/workflows/ci.yml

@@ -104,7 +104,7 @@ jobs:
         run: cargo minimal-versions test -- --test-threads 1
 
   min-versions-msrv:
-    name: Minimal Depencency Versions (MSRV)
+    name: Minimal Dependency Versions (MSRV)
     runs-on: ubuntu-latest
     needs: [lints, docs]
     env:

src/signal_handling.rs

@@ -3,6 +3,8 @@
 async fn wait_for_signal_impl() {
     use tokio::signal::unix::{signal, SignalKind};
 
+    // Infos here:
+    // https://www.gnu.org/software/libc/manual/html_node/Termination-Signals.html
     let mut signal_terminate = signal(SignalKind::terminate()).unwrap();
     let mut signal_interrupt = signal(SignalKind::interrupt()).unwrap();
 
@@ -15,15 +17,25 @@ async fn wait_for_signal_impl() {
 /// Waits for a signal that requests a graceful shutdown, Ctrl-C (SIGINT).
 #[cfg(windows)]
 async fn wait_for_signal_impl() {
-    use tokio::signal::ctrl_c;
+    use tokio::signal::windows;
 
-    ctrl_c().await.unwrap();
-    tracing::debug!("Received SIGINT.");
+    // Infos here:
+    // https://learn.microsoft.com/en-us/windows/console/handlerroutine
+    let mut signal_c = windows::ctrl_c().unwrap();
+    let mut signal_break = windows::ctrl_break().unwrap();
+    let mut signal_close = windows::ctrl_close().unwrap();
+    let mut signal_shutdown = windows::ctrl_shutdown().unwrap();
+
+    tokio::select! {
+        _ = signal_c.recv() => tracing::debug!("Received CTRL_C."),
+        _ = signal_break.recv() => tracing::debug!("Received CTRL_BREAK."),
+        _ = signal_close.recv() => tracing::debug!("Received CTRL_CLOSE."),
+        _ = signal_shutdown.recv() => tracing::debug!("Received CTRL_SHUTDOWN."),
+    };
 }
 
-/// Registers Ctrl+C and SIGTERM handlers to cause a program shutdown.
-/// Further, registers a custom panic handler to also initiate a shutdown.
-/// Otherwise, a multi-threaded system would deadlock on panik.
+/// Registers signal handlers and waits for a signal that
+/// indicates a shutdown request.
 pub(crate) async fn wait_for_signal() {
     wait_for_signal_impl().await
 }

src/toplevel.rs

@@ -102,10 +102,14 @@ impl<ErrType: ErrTypeTraits> Toplevel<ErrType> {
     /// The following signals will be handled:
     ///
     /// - On Windows:
-    ///     - Ctrl+C (SIGINT)
+    ///     - `CTRL_C`
+    ///     - `CTRL_BREAK`
+    ///     - `CTRL_CLOSE`
+    ///     - `CTRL_SHUTDOWN`
     ///
     /// - On Unix:
-    ///     - SIGINT and SIGTERM
+    ///     - `SIGINT`
+    ///     - `SIGTERM`
     ///
     /// # Caveats
     ///