Scuffed code, not tested yet

src/os/mod.rs

@@ -39,3 +39,37 @@ pub fn kill_gracefully(pid: u32) -> bool {
         "gracefully killing Minecraft server process not implemented on non-Unix platforms"
     );
 }
+
+/// Freeze process.
+/// Results in undefined behavior if PID is invaild.
+///
+/// # Panics
+/// Panics on platforms other than Unix.
+#[allow(unreachable_code)]
+pub fn freeze(pid: u32) -> bool {
+    #[cfg(unix)]
+    unsafe {
+        return unix::freeze(pid);
+    }
+
+    unimplemented!(
+        "Freezing the Minecraft server process is not implemented on non-Unix platforms."
+    );
+}
+
+/// Unfreeze process.
+/// Results in undefined behavior if PID is invaild.
+///
+/// # Panics
+/// Panics on platforms other than Unix.
+#[allow(unreachable_code)]
+pub fn unfreeze(pid: u32) -> bool {
+    #[cfg(unix)]
+    unsafe {
+        return unix::unfreeze(pid);
+    }
+
+    unimplemented!(
+        "Unfreezing the Minecraft server process is not implemented on non-Unix platforms."
+    );
+}

src/server.rs

@@ -218,7 +218,10 @@ impl Server {
         }
 
         // Spawn server in new task
-        Self::spawn_server_task(config, server);
+        // TODO uncomment this and add config option
+        //Self::spawn_server_task(config, server);
+        // TODO actual error handling
+        os::unfreeze((*server.pid.lock().await).unwrap());
 
         true
     }
@@ -587,9 +590,13 @@ async fn stop_server_signal(config: &Config, server: &Server) -> bool {
     };
 
     // Send kill signal
-    if !crate::os::kill_gracefully(pid) {
+    // TODO uncomment this and add a config option
+    /*if !crate::os::kill_gracefully(pid) {
         error!(target: "lazymc", "Failed to send stop signal to server process");
         return false;
+    }*/
+    if !os::freeze(pid) {
+        error!(target: "lazymc", "Failed to send freeze signal to server process.");
     }
 
     // Update from starting/started to stopping