LibIPC: Move AutoCloseFileDescriptor to its own header

Author: https://github.com/stasoid
Commit: ccf303eefc
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5010
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibIPC/AutoCloseFileDescriptor.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025, the Ladybird developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/RefCounted.h>
+#include <LibCore/System.h>
+
+namespace IPC {
+
+class AutoCloseFileDescriptor : public RefCounted<AutoCloseFileDescriptor> {
+public:
+    AutoCloseFileDescriptor(int fd)
+        : m_fd(fd)
+    {
+    }
+
+    ~AutoCloseFileDescriptor()
+    {
+        if (m_fd != -1)
+            (void)Core::System::close(m_fd);
+    }
+
+    int value() const { return m_fd; }
+
+    int take_fd()
+    {
+        int fd = m_fd;
+        m_fd = -1;
+        return fd;
+    }
+
+private:
+    int m_fd;
+};
+
+}