DBus 實現IPC的 配置 及流程 及 代碼實現

com.test.hello.service,安裝到dbus系統目錄下

[D-BUS Service]
Name=com.test.hello
Exec=/bin/false
SystemdService=hello.service

hello.service,安裝到systemd下

[Unit]
Description=hello
[Service]
Type=dbus
BusName=com.test.hello
ExecStart=/usr/bin/hello
Restart=on-failure
SuccessExitStatus=0 38
[Install]
WantedBy=multi-user.target

client調用代碼

bool request_to_server()
{

    GError *gerror = NULL;
	GDBusProxy *bproxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
						 G_DBUS_PROXY_FLAGS_NONE,
						 NULL,
						 "com.test.hello",
						 "/com/test/hello",
						 "com.test.hello",
						 NULL,
						 &gerror);


    if (NULL == bproxy) {
        printf ("g_bus_get_sync Failed [%s]", gerror ? gerror->message : NULL);
        return false;
    }

    GVariant *result = g_dbus_proxy_call_sync (bproxy,
                       "here is the message to send",
                       g_variant_new ("(i)", getpid()),
                       G_DBUS_CALL_FLAGS_NONE,
                       60000,  /* msec, 60s*/
                       NULL,
                       &gerror);
    if (!result) {
        printf ("g_bus_get_sync Failed [%s]", gerror ? gerror->message : NULL);
        return false;
    }

    return true;
}

server迴應代碼

static const gchar *dbus_interface_xml =
    "<node>"
    "	<interface name='com.test.hello'>"
    "		<method name='here is the message to send'>"
    "			<arg type='i' name='caller_pid' direction='in' />"
    "			<arg type='i' name='ret' direction='out' />"
    "		</method>"
    "	</interface>"
    "</node>";

static GDBusInterfaceInfo *dbus_interface_info;

static GDBusNodeInfo *introspection_data = NULL;

static guint owner_id;

static void
handle_method_call (GDBusConnection *connection,
                    const gchar *sender,
                    const gchar *object_path,
                    const gchar *interface_name,
                    const gchar *method_name,
                    GVariant *parameters,
                    GDBusMethodInvocation *invocation,
                    gpointer user_data)
{
    if (!g_strcmp0 (method_name, "here is the message to send")) {
        int caller_pid = 0;
        g_variant_get (parameters, "(i)", &caller_pid);
        g_dbus_method_invocation_return_value (invocation, g_variant_new ("(i)", 0));
        printf ("cloud launched by pid [%d]", caller_pid);
    }
}

static const GDBusInterfaceVTable interface_vtable = {
    handle_method_call,
    NULL,
    NULL
};


static void
on_bus_acquired (GDBusConnection *connection,
                 const gchar *name,
                 gpointer user_data)
{
    guint registration_id;
    GError *error = NULL;

    registration_id = g_dbus_connection_register_object (connection,
                      "/com/test/hello",
                      introspection_data->interfaces[0],
                      &interface_vtable,
                      NULL,  /* user_data */
                      NULL,  /* user_data_free_func */
                      &error); /* GError** */
    if (registration_id == 0) {
        printf ("g_dbus_connection_register_object error[%s]", error->message);
        g_error_free (error);
    }
    printf ("backup_on_bus_acquired end [%d]", registration_id);
    //g_bus_unown_name(owner_id);
    //g_dbus_node_info_unref(introspection_data);
}

static void
on_name_acquired (GDBusConnection *connection, const gchar *name, gpointer user_data)
{

}

static void
on_name_lost (GDBusConnection *connection, const gchar *name, gpointer user_data)
{

}

static void __reply_launch_request_to_client(void)
{

    introspection_data = g_dbus_node_info_new_for_xml (dbus_interface_xml, NULL);
    if (NULL == introspection_data) {
        printf ("g_dbus_node_info_new_for_xml Failed");
        return;
    }

    dbus_interface_info = introspection_data->interfaces[0];

    owner_id = g_bus_own_name (G_BUS_TYPE_SYSTEM,
                               "com.test.hello",
                               G_BUS_NAME_OWNER_FLAGS_NONE,
                               on_bus_acquired,
                               on_name_acquired,
                               on_name_lost,
                               NULL,
                               NULL);


}