From ac0ac2397bec859c50f869d38fb07718e2dbb360 Mon Sep 17 00:00:00 2001
From: TomiEckert <tomivoook23@gmail.com>
Date: Sat, 28 Feb 2026 14:47:17 +0100
Subject: [PATCH] feat: Add daemon single-instance lock and graceful shutdown
 to systemd service.

---
 Core/DaemonService.cs | 14 ++++++++++++++
 toak.service          |  1 +
 2 files changed, 15 insertions(+)

diff --git a/Core/DaemonService.cs b/Core/DaemonService.cs
index 2020675..1350b0d 100644
--- a/Core/DaemonService.cs
+++ b/Core/DaemonService.cs
@@ -25,8 +25,22 @@ public static class DaemonService
         return Path.Combine(runtimeDir, "toak.sock");
     }
 
+    private static FileStream? _lockFile;
+
     public static async Task StartAsync(bool verbose)
     {
+        var lockPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "toak", "daemon.lock");
+        try
+        {
+            Directory.CreateDirectory(Path.GetDirectoryName(lockPath)!);
+            _lockFile = new FileStream(lockPath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
+        }
+        catch (IOException)
+        {
+            Console.WriteLine("Toak daemon is already running.");
+            return;
+        }
+
         Logger.Verbose = verbose;
         var socketPath = GetSocketPath();
 
diff --git a/toak.service b/toak.service
index e062f34..00e3b7a 100644
--- a/toak.service
+++ b/toak.service
@@ -5,6 +5,7 @@ After=network.target
 [Service]
 Type=simple
 ExecStart=/usr/bin/toak daemon
+ExecStop=/bin/kill -INT $MAINPID
 Restart=always
 RestartSec=3