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diff --git a/wsutil/wmem/wmem_user_cb.h b/wsutil/wmem/wmem_user_cb.h
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+++ b/wsutil/wmem/wmem_user_cb.h
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+/* wmem_user_cb.h
+ * Definitions for the Wireshark Memory Manager User Callbacks
+ * Copyright 2012, Evan Huus <eapache@gmail.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef __WMEM_USER_CB_H__
+#define __WMEM_USER_CB_H__
+
+#include <glib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/** @addtogroup wmem
+ *  @{
+ *    @defgroup wmem-user-cb User Callbacks
+ *
+ *    User callbacks.
+ *
+ *    @{
+ */
+
+/** The events that can trigger a callback. */
+typedef enum _wmem_cb_event_t {
+    WMEM_CB_FREE_EVENT,    /**< wmem_free_all() */
+    WMEM_CB_DESTROY_EVENT  /**< wmem_destroy_allocator() */
+} wmem_cb_event_t;
+
+/** Function signature for registered user callbacks.
+ *
+ * allocator The allocator that triggered this callback.
+ * event     The event type that triggered this callback.
+ * user_data Whatever user_data was originally passed to the call to
+ *                  wmem_register_callback().
+ * @return          FALSE to unregister the callback, TRUE otherwise.
+ */
+typedef gboolean (*wmem_user_cb_t) (wmem_allocator_t*, wmem_cb_event_t, void*);
+
+/** Register a callback function with the given allocator pool.
+ *
+ * @param allocator The allocator with which to register the callback.
+ * @param callback  The function to be called as the callback.
+ * @param user_data An arbitrary data pointer that is passed to the callback as
+ *                  a way to specify extra parameters or store extra data. Note
+ *                  that this pointer is not freed when a callback is finished,
+ *                  you have to do that yourself in the callback, or just
+ *                  allocate it in the appropriate wmem pool.
+ * @return          ID of this callback that can be passed back to
+ *                  wmem_unregister_callback().
+ */
+WS_DLL_PUBLIC
+guint
+wmem_register_callback(wmem_allocator_t *allocator, wmem_user_cb_t callback,
+        void *user_data);
+
+/** Unregister the callback function with the given ID.
+ *
+ * @param allocator The allocator from which to unregister the callback.
+ * @param id        The callback id as returned from wmem_register_callback().
+ */
+WS_DLL_PUBLIC
+void
+wmem_unregister_callback(wmem_allocator_t *allocator, guint id);
+
+/**   @}
+ *  @} */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __WMEM_USER_CB_H__ */
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */