1 files changed, 67 insertions, 0 deletions
diff --git a/widget/gtk/DBusMenu.cpp b/widget/gtk/DBusMenu.cpp
new file mode 100644
index 0000000000..8672de40ef
--- /dev/null
+++ b/widget/gtk/DBusMenu.cpp
@@ -0,0 +1,67 @@
+/* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
+/* 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/. */
+
+#include "DBusMenu.h"
+#include "prlink.h"
+#include "nsThreadUtils.h"
+#include "mozilla/ArrayUtils.h"
+
+namespace mozilla::widget {
+
+#define FUNC(name, type, params) \
+  DBusMenuFunctions::_##name##_fn DBusMenuFunctions::s_##name;
+DBUSMENU_GLIB_FUNCTIONS
+DBUSMENU_GTK_FUNCTIONS
+#undef FUNC
+
+static PRLibrary* gDbusmenuGlib = nullptr;
+static PRLibrary* gDbusmenuGtk = nullptr;
+
+using DBusMenuFunc = void (*)();
+struct DBusMenuDynamicFunction {
+  const char* functionName;
+  DBusMenuFunc* function;
+};
+
+static bool sInitialized;
+static bool sLibPresent;
+
+/* static */ bool DBusMenuFunctions::Init() {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (sInitialized) {
+    return sLibPresent;
+  }
+  sInitialized = true;
+#define FUNC(name, type, params) \
+  {#name, (DBusMenuFunc*)&DBusMenuFunctions::s_##name},
+  static const DBusMenuDynamicFunction kDbusmenuGlibSymbols[] = {
+      DBUSMENU_GLIB_FUNCTIONS};
+  static const DBusMenuDynamicFunction kDbusmenuGtkSymbols[] = {
+      DBUSMENU_GTK_FUNCTIONS};
+
+#define LOAD_LIBRARY(symbol, name)                                            \
+  if (!g##symbol) {                                                           \
+    g##symbol = PR_LoadLibrary(name);                                         \
+    if (!g##symbol) {                                                         \
+      return false;                                                           \
+    }                                                                         \
+  }                                                                           \
+  for (uint32_t i = 0; i < mozilla::ArrayLength(k##symbol##Symbols); ++i) {   \
+    *k##symbol##Symbols[i].function =                                         \
+        PR_FindFunctionSymbol(g##symbol, k##symbol##Symbols[i].functionName); \
+    if (!*k##symbol##Symbols[i].function) {                                   \
+      return false;                                                           \
+    }                                                                         \
+  }
+
+  LOAD_LIBRARY(DbusmenuGlib, "libdbusmenu-glib.so.4")
+  LOAD_LIBRARY(DbusmenuGtk, "libdbusmenu-gtk3.so.4")
+#undef LOAD_LIBRARY
+
+  sLibPresent = true;
+  return true;
+}
+
+}  // namespace mozilla::widget