terminal: allow user-context to be retrieved/stored

Add "userdata" storage to a bunch of external objects, namely displays and
sessions. Furthermore, add some property retrieval helpers.

This is required if we want external API users to not duplicate our own
object hashtables, but retrieve context from the objects themselves.

src/libsystemd-terminal/grdev-internal.h

@@ -94,6 +94,7 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(grdev_tile*, grdev_tile_free);
 struct grdev_display {
         grdev_session *session;
         char *name;
+        void *userdata;
 
         size_t n_leafs;
         grdev_tile *tile;

src/libsystemd-terminal/grdev.c

@@ -282,6 +282,24 @@ grdev_display *grdev_display_free(grdev_display *display) {
         return NULL;
 }
 
+void grdev_display_set_userdata(grdev_display *display, void *userdata) {
+        assert(display);
+
+        display->userdata = userdata;
+}
+
+void *grdev_display_get_userdata(grdev_display *display) {
+        assert_return(display, NULL);
+
+        return display->userdata;
+}
+
+const char *grdev_display_get_name(grdev_display *display) {
+        assert_return(display, NULL);
+
+        return display->name;
+}
+
 bool grdev_display_is_enabled(grdev_display *display) {
         return display && display->enabled;
 }

src/libsystemd-terminal/grdev.h

@@ -108,6 +108,11 @@ struct grdev_display_target {
         const grdev_fb *fb;
 };
 
+void grdev_display_set_userdata(grdev_display *display, void *userdata);
+void *grdev_display_get_userdata(grdev_display *display);
+
+const char *grdev_display_get_name(grdev_display *display);
+
 bool grdev_display_is_enabled(grdev_display *display);
 void grdev_display_enable(grdev_display *display);
 void grdev_display_disable(grdev_display *display);

src/libsystemd-terminal/sysview-internal.h

@@ -64,6 +64,7 @@ struct sysview_session {
         sysview_seat *seat;
         char *name;
         char *path;
+        void *userdata;
 
         sd_bus_slot *slot_take_control;
 

src/libsystemd-terminal/sysview.c

@@ -104,6 +104,12 @@ sysview_device *sysview_device_free(sysview_device *device) {
         return NULL;
 }
 
+const char *sysview_device_get_name(sysview_device *device) {
+        assert_return(device, NULL);
+
+        return device->name;
+}
+
 unsigned int sysview_device_get_type(sysview_device *device) {
         assert_return(device, (unsigned)-1);
 
@@ -243,6 +249,18 @@ sysview_session *sysview_session_free(sysview_session *session) {
         return NULL;
 }
 
+void sysview_session_set_userdata(sysview_session *session, void *userdata) {
+        assert(session);
+
+        session->userdata = userdata;
+}
+
+void *sysview_session_get_userdata(sysview_session *session) {
+        assert_return(session, NULL);
+
+        return session->userdata;
+}
+
 const char *sysview_session_get_name(sysview_session *session) {
         assert_return(session, NULL);
 

src/libsystemd-terminal/sysview.h

@@ -116,6 +116,7 @@ enum {
         SYSVIEW_DEVICE_CNT
 };
 
+const char *sysview_device_get_name(sysview_device *device);
 unsigned int sysview_device_get_type(sysview_device *device);
 struct udev_device *sysview_device_get_ud(sysview_device *device);
 
@@ -123,6 +124,9 @@ struct udev_device *sysview_device_get_ud(sysview_device *device);
  * Sessions
  */
 
+void sysview_session_set_userdata(sysview_session *session, void *userdata);
+void *sysview_session_get_userdata(sysview_session *session);
+
 const char *sysview_session_get_name(sysview_session *session);
 
 int sysview_session_take_control(sysview_session *session);