Introduce SharedMemory

lib/base/CMakeLists.txt

@@ -65,6 +65,7 @@ set(base_SOURCES
   scriptutils.cpp scriptutils.hpp
   serializer.cpp serializer.hpp
   shared.hpp
+  shared-memory.hpp
   shared-object.hpp
   singleton.hpp
   socket.cpp socket.hpp

lib/base/shared-memory.hpp

@@ -0,0 +1,45 @@
+/* Icinga 2 | (c) 2023 Icinga GmbH | GPLv2+ */
+
+#pragma once
+
+#include <boost/interprocess/anonymous_shared_memory.hpp>
+#include <utility>
+
+namespace icinga
+{
+
+/**
+ * Type-safe memory shared across fork(2).
+ *
+ * @ingroup base
+ */
+template<class T>
+class SharedMemory
+{
+public:
+	template<class... Args>
+	SharedMemory(Args&&... args) : m_Memory(boost::interprocess::anonymous_shared_memory(sizeof(T)))
+	{
+		new(GetAddress()) T(std::forward<Args>(args)...);
+	}
+
+	SharedMemory(const SharedMemory&) = delete;
+	SharedMemory(SharedMemory&&) = delete;
+	SharedMemory& operator=(const SharedMemory&) = delete;
+	SharedMemory& operator=(SharedMemory&&) = delete;
+
+	inline T& Get() const
+	{
+		return *GetAddress();
+	}
+
+private:
+	inline T* GetAddress() const
+	{
+		return (T*)m_Memory.get_address();
+	}
+
+	boost::interprocess::mapped_region m_Memory;
+};
+
+}