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diff --git a/vcl/inc/unx/sessioninhibitor.hxx b/vcl/inc/unx/sessioninhibitor.hxx
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+++ b/vcl/inc/unx/sessioninhibitor.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <X11/Xlib.h>
+#include <X11/Xmd.h>
+
+#include <vcl/dllapi.h>
+
+#include <optional>
+#include <string_view>
+
+enum ApplicationInhibitFlags
+{
+    APPLICATION_INHIBIT_LOGOUT = (1 << 0),
+    APPLICATION_INHIBIT_IDLE = (1 << 3) // Inhibit the session being marked as idle
+};
+
+class VCL_PLUGIN_PUBLIC SessionManagerInhibitor
+{
+public:
+    void inhibit(bool bInhibit, std::u16string_view sReason, ApplicationInhibitFlags eType,
+                 unsigned int window_system_id, std::optional<Display*> pDisplay,
+                 const char* application_id = nullptr);
+
+private:
+    // These are all used as guint, however this header may be included
+    // in kde/tde/etc backends, where we would ideally avoid having
+    // any glib dependencies, hence the direct use of unsigned int.
+    std::optional<unsigned int> mnFDOSSCookie; // FDO ScreenSaver Inhibit
+    std::optional<unsigned int> mnFDOPMCookie; // FDO PowerManagement Inhibit
+    std::optional<unsigned int> mnGSMCookie;
+    std::optional<unsigned int> mnMSMCookie;
+
+    std::optional<int> mnXScreenSaverTimeout;
+
+#if !defined(__sun)
+    BOOL mbDPMSWasEnabled;
+    CARD16 mnDPMSStandbyTimeout;
+    CARD16 mnDPMSSuspendTimeout;
+    CARD16 mnDPMSOffTimeout;
+#endif
+
+    // There are a bunch of different dbus based inhibition APIs. Some call
+    // themselves ScreenSaver inhibition, some are PowerManagement inhibition,
+    // but they appear to have the same effect. There doesn't appear to be one
+    // all encompassing standard, hence we should just try all of them.
+    //
+    // The current APIs we have: (note: the list of supported environments is incomplete)
+    // FDSSO: org.freedesktop.ScreenSaver::Inhibit - appears to be supported only by KDE?
+    // FDOPM: org.freedesktop.PowerManagement.Inhibit::Inhibit - XFCE, (KDE) ?
+    //        (KDE: doesn't inhibit screensaver, but does inhibit PowerManagement)
+    // GSM: org.gnome.SessionManager::Inhibit - gnome 3
+    // MSM: org.mate.Sessionmanager::Inhibit - Mate <= 1.10, is identical to GSM
+    //       (This is replaced by the GSM interface from Mate 1.12 onwards)
+    //
+    // Note: the Uninhibit call has different spelling in FDOSS (UnInhibit) vs GSM (Uninhibit)
+    void inhibitFDOSS(bool bInhibit, const char* appname, const char* reason);
+    void inhibitFDOPM(bool bInhibit, const char* appname, const char* reason);
+    void inhibitGSM(bool bInhibit, const char* appname, const char* reason,
+                    ApplicationInhibitFlags eType, unsigned int window_system_id);
+    void inhibitMSM(bool bInhibit, const char* appname, const char* reason,
+                    ApplicationInhibitFlags eType, unsigned int window_system_id);
+
+    void inhibitXScreenSaver(bool bInhibit, Display* pDisplay);
+    static void inhibitXAutoLock(bool bInhibit, Display* pDisplay);
+    void inhibitDPMS(bool bInhibit, Display* pDisplay);
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */