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diff --git a/src/VBox/Main/testcase/tstUSBLinux.h b/src/VBox/Main/testcase/tstUSBLinux.h
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+++ b/src/VBox/Main/testcase/tstUSBLinux.h
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+/* $Id: tstUSBLinux.h $ */
+/** @file
+ * VirtualBox USB Proxy Service class, test version for Linux hosts.
+ */
+
+/*
+ * Copyright (C) 2008-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef MAIN_INCLUDED_SRC_testcase_tstUSBLinux_h
+#define MAIN_INCLUDED_SRC_testcase_tstUSBLinux_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+typedef int HRESULT;
+enum { S_OK = 0, E_NOTIMPL = 1 };
+
+#include <VBox/usb.h>
+#include <VBox/usbfilter.h>
+
+#include <VBox/err.h>
+
+#ifdef VBOX_USB_WITH_SYSFS
+# include <libhal.h>
+#endif
+
+#include <stdio.h>
+/**
+ * The Linux hosted USB Proxy Service.
+ */
+class USBProxyServiceLinux
+{
+public:
+    USBProxyServiceLinux()
+        : mLastError(VINF_SUCCESS)
+    {}
+
+    HRESULT initSysfs(void);
+    PUSBDEVICE getDevicesFromSysfs(void);
+    int getLastError(void)
+    {
+        return mLastError;
+    }
+
+private:
+    int start(void) { return VINF_SUCCESS; }
+    static void freeDevice(PUSBDEVICE) {}  /* We don't care about leaks in a test. */
+    int usbProbeInterfacesFromLibhal(const char *pszHalUuid, PUSBDEVICE pDev);
+    int mLastError;
+#  ifdef VBOX_USB_WITH_SYSFS
+    /** Our connection to DBus for getting information from hal.  This will be
+     * NULL if the initialisation failed. */
+    DBusConnection *mDBusConnection;
+    /** Handle to libhal. */
+    LibHalContext *mLibHalContext;
+#  endif
+};
+
+#endif /* !MAIN_INCLUDED_SRC_testcase_tstUSBLinux_h */
+