[linux] Add GDBus support in PlatformMgr to drive DBUS communication.

configure.ac

@@ -1926,6 +1926,25 @@ if test "${CHIP_DEVICE_LAYER_TARGET_LINUX}" = 1; then
     )
 fi
 
+#
+#
+# GIO
+#
+
+if test "${CHIP_DEVICE_LAYER_TARGET_LINUX}" = 1; then
+    PKG_CHECK_MODULES([GIO], [gio-2.0])
+
+    # Check for GIO library is available.
+    AC_CHECK_LIB([gio-2.0], [g_bus_get_sync],
+    [
+        AC_DEFINE([CHIP_WITH_GIO], [1], [Define to 1 to build CHIP with GIO])
+    ],
+    [
+        AC_DEFINE([CHIP_WITH_GIO], [0], [Define to 0 to build CHIP without GIO])
+    ]
+    )
+fi
+
 #
 # Sockets
 #
@@ -2350,6 +2369,7 @@ AC_MSG_NOTICE([
   PThreads compile flags                           : ${PTHREAD_CFLAGS:--}
   PThreads link libraries                          : ${PTHREAD_LIBS:--}
   IniPP compile flags                              : ${INIPP_CPPFLAGS:--}
+  GIO compile flags                                : ${GIO_CFLAGS:--}
   C Preprocessor                                   : ${CPP}
   C Compiler                                       : ${CC}
   C++ Preprocessor                                 : ${CXXCPP}

src/platform/Linux/PlatformManagerImpl.cpp

@@ -27,15 +27,36 @@
 #include <platform/PlatformManager.h>
 #include <platform/internal/GenericPlatformManagerImpl_POSIX.ipp>
 
+#include <thread>
+
 namespace chip {
 namespace DeviceLayer {
 
 PlatformManagerImpl PlatformManagerImpl::sInstance;
 
+#if CHIP_WITH_GIO
+static void GDBus_Thread()
+{
+    GMainLoop * loop = g_main_loop_new(nullptr, false);
+
+    g_main_loop_run(loop);
+    g_main_loop_unref(loop);
+}
+#endif
+
 CHIP_ERROR PlatformManagerImpl::_InitChipStack(void)
 {
     CHIP_ERROR err;
 
+#if CHIP_WITH_GIO
+    GError * error = NULL;
+
+    this->mpGDBusConnection = UniqueGDBusConnection(g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error));
+
+    std::thread gdbusThread(GDBus_Thread);
+    gdbusThread.detach();
+#endif
+
     // Initialize the configuration system.
     err = Internal::PosixConfig::Init();
     SuccessOrExit(err);
@@ -49,5 +70,12 @@ CHIP_ERROR PlatformManagerImpl::_InitChipStack(void)
     return err;
 }
 
+#if CHIP_WITH_GIO
+GDBusConnection * PlatformManagerImpl::GetGDBusConnection()
+{
+    return this->mpGDBusConnection.get();
+}
+#endif
+
 } // namespace DeviceLayer
 } // namespace chip

src/platform/Linux/PlatformManagerImpl.h

@@ -24,8 +24,13 @@
 #ifndef PLATFORM_MANAGER_IMPL_H
 #define PLATFORM_MANAGER_IMPL_H
 
+#include <memory>
 #include <platform/internal/GenericPlatformManagerImpl_POSIX.h>
 
+#if CHIP_WITH_GIO
+#include <gio/gio.h>
+#endif
+
 namespace chip {
 namespace DeviceLayer {
 
@@ -44,8 +49,9 @@ class PlatformManagerImpl final : public PlatformManager, public Internal::Gener
 
 public:
     // ===== Platform-specific members that may be accessed directly by the application.
-
-    /* none so far */
+#if CHIP_WITH_GIO
+    GDBusConnection * GetGDBusConnection();
+#endif
 
 private:
     // ===== Methods that implement the PlatformManager abstract interface.
@@ -59,6 +65,15 @@ class PlatformManagerImpl final : public PlatformManager, public Internal::Gener
     friend class Internal::BLEManagerImpl;
 
     static PlatformManagerImpl sInstance;
+
+#if CHIP_WITH_GIO
+    struct GDBusConnectionDeleter
+    {
+        void operator()(GDBusConnection * conn) { g_object_unref(conn); }
+    };
+    using UniqueGDBusConnection = std::unique_ptr<GDBusConnection, GDBusConnectionDeleter>;
+    UniqueGDBusConnection mpGDBusConnection;
+#endif
 };
 
 /**

src/platform/Makefile.am

@@ -154,6 +154,7 @@ if CHIP_DEVICE_LAYER_TARGET_LINUX
 SUBDIRS                                += tests
 
 libDeviceLayer_a_CPPFLAGS              += \
+    $(GIO_CFLAGS)                         \
     $(INIPP_CPPFLAGS)                     \
     $(NULL)
 

src/platform/tests/Makefile.am

@@ -69,14 +69,19 @@ AM_CPPFLAGS                                    = \
     $(NULL)
 
 if CHIP_DEVICE_LAYER_TARGET_LINUX
+AM_CPPFLAGS                                   += \
+    $(GIO_CFLAGS)                                \
+    $(NULL)
+
 if CHIP_WITH_OT_BR_POSIX
 AM_CPPFLAGS                                   += \
     $(DBUS_CFLAGS)                               \
     $(OT_BR_POSIX_CPPFLAGS)                     \
     $(NULL)
 libPlatformTests_a_SOURCES += TestThreadStackMgr.cpp
-endif
-endif
+endif # CHIP_WITH_OT_BR_POSIX
+endif # CHIP_DEVICE_LAYER_TARGET_LINUX
+
 
 CHIP_LDADD                                      = \
     $(top_builddir)/src/platform/libDeviceLayer.a \
@@ -86,13 +91,17 @@ CHIP_LDADD                                      = \
     $(NULL)
 
 if CHIP_DEVICE_LAYER_TARGET_LINUX
+CHIP_LDADD                                    += \
+    $(GIO_CFLAGS) $(GIO_LIBS)                    \
+    $(NULL)
+
 if CHIP_WITH_OT_BR_POSIX
 CHIP_LDADD                                    += \
     $(DBUS_LIBS)                                 \
     $(OT_BR_POSIX_LDFLAGS) $(OT_BR_POSIX_LIBS) \
     $(NULL)
-endif
-endif
+endif # CHIP_WITH_OT_BR_POSIX
+endif # CHIP_DEVICE_LAYER_TARGET_LINUX
 
 COMMON_LDADD                                          = \
     libPlatformTests.a                                  \