From 36dabafe242e8dc290ff76885c43c773b6d20b28 Mon Sep 17 00:00:00 2001
From: Christian Krinitsin <mail@krinitsin.com>
Date: Sun, 23 Mar 2025 20:11:53 +0100
Subject: prevent multiple server instances

---
 src/server/shared_memory_server.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/server/shared_memory_server.h b/src/server/shared_memory_server.h
index e28fb6a..d4be69f 100644
--- a/src/server/shared_memory_server.h
+++ b/src/server/shared_memory_server.h
@@ -22,7 +22,11 @@ public:
      */
     Server()
     {
-        shm_fd = shm_open(SHM_NAME, O_CREAT | O_RDWR, 0666);
+        shm_fd = shm_open(SHM_NAME, O_EXCL | O_CREAT | O_RDWR, 0666);
+        if (-1 == shm_fd) {
+            std::cout << "Server is already running!" << '\n';
+            exit(-1);
+        }
 
         ftruncate(shm_fd, sizeof(SharedMemory));
 
-- 
cgit 1.4.1