various fixes and code clean up stuff. improved frame management stability

.gitignore

@@ -2,3 +2,4 @@ build
 fuzz_corpus
 fuzzing-directory
 PROGRESS.md
+TODO.md

nedm.c

@@ -20,6 +20,7 @@
 #include <wayland-server-core.h>
 #include <wlr/backend.h>
 #include <wlr/backend/headless.h>
+#include <wlr/backend/session.h>
 #include <wlr/render/allocator.h>
 #include <wlr/render/wlr_renderer.h>
 #include <wlr/types/wlr_compositor.h>
@@ -119,12 +120,20 @@ handle_signal(int signal, void *const data) {
 	case SIGINT:
 		/* Fallthrough */
 	case SIGTERM:
-		display_terminate(server);
+		if(server && server->wl_display) {
+			// Only terminate if we're sure the server is in a valid state
+			display_terminate(server);
+		}
 		return 0;
 	case SIGALRM: {
-		struct nedm_output *output;
+		// Only clear messages if server is running and valid
-		wl_list_for_each(output, &server->outputs, link) {
+		if(server && server->running && !wl_list_empty(&server->outputs)) {
-			message_clear(output);
+			struct nedm_output *output;
+			wl_list_for_each(output, &server->outputs, link) {
+				if(output) {
+					message_clear(output);
+				}
+			}
 		}
 		return 0;
 	}
@@ -137,6 +146,7 @@ handle_signal(int signal, void *const data) {
 	}
 }
 
+
 static void
 usage(FILE *file, const char *const cage) {
 	fprintf(file,
@@ -418,6 +428,14 @@ main(int argc, char *argv[]) {
 	    wl_event_loop_add_signal(event_loop, SIGPIPE, handle_signal, &server);
 	server.event_loop = event_loop;
 
+	// Let wlroots handle device selection automatically for better compatibility
+	const char *force_drm_device = getenv("WLR_DRM_DEVICES");
+	if (force_drm_device) {
+		wlr_log(WLR_INFO, "Using user-specified DRM devices: %s", force_drm_device);
+	} else {
+		wlr_log(WLR_DEBUG, "Using automatic DRM device selection");
+	}
+	
 	backend = wlr_backend_autocreate(event_loop, &server.session);
 	server.headless_backend = wlr_headless_backend_create(event_loop);
 	if(!backend) {
@@ -427,6 +445,15 @@ main(int argc, char *argv[]) {
 	}
 	server.backend = backend;
 
+	// Session is handled automatically by wlroots - no custom handlers needed
+	if (server.session) {
+		server.session_is_active = true; // Start active
+		wlr_log(WLR_INFO, "Session available - VT switching handled by wlroots");
+	} else {
+		wlr_log(WLR_DEBUG, "No session available - running without VT switching");
+		server.session_is_active = true; // Fallback for sessionless operation
+	}
+
 	if(!drop_permissions()) {
 		ret = 1;
 		goto end;
@@ -812,6 +839,8 @@ end:
 		seat_destroy(server.seat);
 	}
 
+	// Session cleanup handled automatically by wlroots
+
 	if(sigint_source != NULL) {
 		wl_event_source_remove(sigint_source);
 		wl_event_source_remove(sigterm_source);

output.c

@@ -71,6 +71,10 @@ output_clear(struct nedm_output *output) {
 	struct nedm_view *view, *view_tmp;
 	if(server->running) {
 		for(unsigned int i = 0; i < server->nws; ++i) {
+			if(!output->workspaces || !output->workspaces[i] || 
+			   !output->workspaces[i]->focused_tile) {
+				continue;
+			}
 
 			bool first = true;
 			for(struct nedm_tile *tile = output->workspaces[i]->focused_tile;
@@ -79,20 +83,23 @@ output_clear(struct nedm_output *output) {
 				first = false;
 				workspace_tile_update_view(tile, NULL);
 			}
-			struct nedm_workspace *ws =
+			struct nedm_workspace *ws = NULL;
-			    server->curr_output
+			if(server->curr_output && server->curr_output->workspaces &&
-			        ->workspaces[server->curr_output->curr_workspace];
+			   server->curr_output->curr_workspace < server->nws &&
+			   server->curr_output->workspaces[server->curr_output->curr_workspace]) {
+				ws = server->curr_output->workspaces[server->curr_output->curr_workspace];
+			}
 			wl_list_for_each_safe(view, view_tmp, &output->workspaces[i]->views,
 			                      link) {
 				wl_list_remove(&view->link);
 				if(wl_list_empty(&server->outputs)) {
 					view->impl->destroy(view);
-				} else {
+				} else if(ws) {
 					wl_list_insert(&ws->views, &view->link);
 					wlr_scene_node_reparent(&view->scene_tree->node, ws->scene);
 					view->workspace = ws;
 					view->tile = ws->focused_tile;
-					if(server->seat->focused_view == NULL) {
+					if(server->seat && server->seat->focused_view == NULL) {
 						seat_set_focus(server->seat, view);
 					}
 				}
@@ -197,8 +204,13 @@ output_destroy(struct nedm_output *output) {
 		wlr_log(WLR_ERROR,
 		        "Failed to allocate memory for output name in output_destroy");
 	}
+	// Note: Don't terminate when outputs become empty - this is normal during:
+	// - VT switches (outputs temporarily disabled)
+	// - Output hotplug events
+	// - Multi-GPU switching
+	// Modern compositors handle this gracefully and wait for outputs to return
 	if(wl_list_empty(&server->outputs) && server->running) {
-		wl_display_terminate(server->wl_display);
+		wlr_log(WLR_DEBUG, "No outputs available - waiting for outputs to return");
 	}
 }
 
@@ -612,9 +624,13 @@ output_make_workspace_fullscreen(struct nedm_output *output, uint32_t ws) {
 	if(ws >= server->nws) {
 		return;
 	}
-	struct nedm_view *current_view = output->workspaces[ws]->focused_tile->view;
+	struct nedm_view *current_view = NULL;
+	if(output->workspaces && ws < output->server->nws &&
+	   output->workspaces[ws] && output->workspaces[ws]->focused_tile) {
+		current_view = output->workspaces[ws]->focused_tile->view;
+	}
 
-	if(current_view == NULL) {
+	if(current_view == NULL && output->workspaces[ws]) {
 		struct nedm_view *it = NULL;
 		wl_list_for_each(it, &output->workspaces[ws]->views, link) {
 			if(view_is_visible(it)) {

seat.c

@@ -803,7 +803,10 @@ process_cursor_motion(struct nedm_seat *seat, uint32_t time) {
 			break;
 		}
 	}
-	if(c_outp) {
+	if(c_outp && nedm_outp->workspaces &&
+	   nedm_outp->curr_workspace < nedm_outp->server->nws &&
+	   nedm_outp->workspaces[nedm_outp->curr_workspace] &&
+	   nedm_outp->workspaces[nedm_outp->curr_workspace]->focused_tile) {
 		struct nedm_tile *c_tile;
 		bool first = true;
 		for(c_tile = nedm_outp->workspaces[nedm_outp->curr_workspace]->focused_tile;
@@ -1184,10 +1187,15 @@ seat_set_focus(struct nedm_seat *seat, struct nedm_view *view) {
 
 	/* Focusing the background */
 	if(view == NULL) {
-		workspace_tile_update_view(
+		if(server->curr_output && server->curr_output->workspaces &&
-		    server->curr_output->workspaces[server->curr_output->curr_workspace]
+		   server->curr_output->curr_workspace < server->nws &&
-		        ->focused_tile,
+		   server->curr_output->workspaces[server->curr_output->curr_workspace] &&
-		    NULL);
+		   server->curr_output->workspaces[server->curr_output->curr_workspace]->focused_tile) {
+			workspace_tile_update_view(
+			    server->curr_output->workspaces[server->curr_output->curr_workspace]
+			        ->focused_tile,
+			    NULL);
+		}
 		seat->focused_view = NULL;
 		if(prev_view != NULL) {
 			view_activate(prev_view, false);

server.c

@@ -66,3 +66,13 @@ server_show_info(struct nedm_server *server) {
 	free(input_str);
 	return ret;
 }
+
+bool
+server_session_is_active(struct nedm_server *server) {
+	if (!server) {
+		return false;
+	}
+	// wlroots handles session state automatically
+	// Just return our tracked state for output termination logic
+	return server->session_is_active;
+}

server.h

@@ -44,6 +44,8 @@ struct nedm_server {
 	struct wl_list output_priorities;
 	struct wlr_backend *headless_backend;
 	struct wlr_session *session;
+	struct wl_listener session_active;
+	bool session_is_active;
 
 	struct wlr_renderer *renderer;
 	struct wlr_allocator *allocator;
@@ -90,5 +92,7 @@ int
 get_mode_index_from_name(char *const *modes, const char *mode_name);
 char *
 server_show_info(struct nedm_server *server);
+bool
+server_session_is_active(struct nedm_server *server);
 
 #endif

view.c

@@ -131,13 +131,16 @@ view_unmap(struct nedm_view *view) {
 #endif
 	{
 		struct nedm_view *prev = view_get_prev_view(view);
-		if(view == view->server->seat->focused_view) {
+		if(view->server && view->server->seat) {
-			seat_set_focus(view->server->seat, prev);
+			if(view == view->server->seat->focused_view) {
-		} else if(view->server->seat->seat->keyboard_state.focused_surface ==
+				seat_set_focus(view->server->seat, prev);
-		          view->wlr_surface) {
+			} else if(view->server->seat->seat && 
-			wlr_seat_keyboard_clear_focus(view->server->seat->seat);
+			          view->server->seat->seat->keyboard_state.focused_surface ==
-			seat_set_focus(view->server->seat,
+			          view->wlr_surface) {
-			               view->server->seat->focused_view);
+				wlr_seat_keyboard_clear_focus(view->server->seat->seat);
+				seat_set_focus(view->server->seat,
+				               view->server->seat->focused_view);
+			}
 		}
 		struct nedm_tile *view_tile = view_get_tile(view);
 		if(view_tile != NULL) {
@@ -146,11 +149,13 @@ view_unmap(struct nedm_view *view) {
 	}
 #if NEDM_HAS_XWAYLAND
 	else {
-		if(view->server->seat->seat->keyboard_state.focused_surface == NULL ||
+		if(view->server && view->server->seat && view->server->seat->seat) {
-		   view->server->seat->seat->keyboard_state.focused_surface ==
+			if(view->server->seat->seat->keyboard_state.focused_surface == NULL ||
-		       view->wlr_surface) {
+			   view->server->seat->seat->keyboard_state.focused_surface ==
-			seat_set_focus(view->server->seat,
+			       view->wlr_surface) {
-			               view->server->seat->focused_view);
+				seat_set_focus(view->server->seat,
+				               view->server->seat->focused_view);
+			}
 		}
 	}
 #endif
@@ -193,7 +198,9 @@ view_map(struct nedm_view *view, struct wlr_surface *surface,
 	{
 		wl_list_insert(&ws->views, &view->link);
 	}
-	seat_set_focus(output->server->seat, view);
+	if(output && output->server && output->server->seat) {
+		seat_set_focus(output->server->seat, view);
+	}
 	int tile_id = 0;
 	if(view->tile == NULL) {
 		tile_id = -1;
@@ -219,9 +226,17 @@ view_destroy(struct nedm_view *view) {
 	wlr_scene_node_destroy(&view->scene_tree->node);
 
 	view->impl->destroy(view);
-	view_activate(curr_output->workspaces[curr_output->curr_workspace]
+	
-	                  ->focused_tile->view,
+	// Safely activate the focused view if it exists
-	              true);
+	if(curr_output && curr_output->workspaces && 
+	   curr_output->curr_workspace < curr_output->server->nws &&
+	   curr_output->workspaces[curr_output->curr_workspace] &&
+	   curr_output->workspaces[curr_output->curr_workspace]->focused_tile &&
+	   curr_output->workspaces[curr_output->curr_workspace]->focused_tile->view) {
+		view_activate(curr_output->workspaces[curr_output->curr_workspace]
+		                  ->focused_tile->view,
+		              true);
+	}
 }
 
 void