1 files changed, 26 insertions, 16 deletions

diff --git a/backend/backend.c b/backend/backend.c
index 78b90007..2d6464b7 100644
--- a/backend/backend.c
+++ b/backend/backend.c
@@ -15,6 +15,7 @@
 #include <wlr/backend/wayland.h>
 #include <wlr/config.h>
 #include <wlr/util/log.h>
+#include "backend/multi.h"
 
 /* WLR_HAS_X11_BACKEND needs to be after wlr/config.h */
 #ifdef WLR_HAS_X11_BACKEND
@@ -56,6 +57,13 @@ struct wlr_renderer *wlr_backend_get_renderer(struct wlr_backend *backend) {
 	return NULL;
 }
 
+struct wlr_session *wlr_backend_get_session(struct wlr_backend *backend) {
+	if (backend->impl->get_session) {
+		return backend->impl->get_session(backend);
+	}
+	return NULL;
+}
+
 static size_t parse_outputs_env(const char *name) {
 	const char *outputs_str = getenv(name);
 	if (outputs_str == NULL) {
@@ -158,10 +166,12 @@ static struct wlr_backend *attempt_backend_by_name(struct wl_display *display,
 		return attempt_headless_backend(display, create_renderer_func);
 	} else if (strcmp(name, "drm") == 0 || strcmp(name, "libinput") == 0) {
 		// DRM and libinput need a session
-		*session = wlr_session_create(display);
 		if (!*session) {
-			wlr_log(WLR_ERROR, "failed to start a session");
-			return NULL;
+			*session = wlr_session_create(display);
+			if (!*session) {
+				wlr_log(WLR_ERROR, "failed to start a session");
+				return NULL;
+			}
 		}
 
 		if (strcmp(name, "libinput") == 0) {
@@ -178,13 +188,12 @@ static struct wlr_backend *attempt_backend_by_name(struct wl_display *display,
 struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
 		wlr_renderer_create_func_t create_renderer_func) {
 	struct wlr_backend *backend = wlr_multi_backend_create(display);
+	struct wlr_multi_backend *multi = (struct wlr_multi_backend *)backend;
 	if (!backend) {
 		wlr_log(WLR_ERROR, "could not allocate multibackend");
 		return NULL;
 	}
 
-	struct wlr_session *session = NULL;
-
 	char *names = getenv("WLR_BACKENDS");
 	if (names) {
 		names = strdup(names);
@@ -197,12 +206,12 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
 		char *saveptr;
 		char *name = strtok_r(names, ",", &saveptr);
 		while (name != NULL) {
-			struct wlr_backend *subbackend =
-				attempt_backend_by_name(display, backend, &session, name, create_renderer_func);
+			struct wlr_backend *subbackend = attempt_backend_by_name(display,
+				backend, &multi->session, name, create_renderer_func);
 			if (subbackend == NULL) {
 				wlr_log(WLR_ERROR, "failed to start backend '%s'", name);
 				wlr_backend_destroy(backend);
-				wlr_session_destroy(session);
+				wlr_session_destroy(multi->session);
 				free(names);
 				return NULL;
 			}
@@ -210,7 +219,7 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
 			if (!wlr_multi_backend_add(backend, subbackend)) {
 				wlr_log(WLR_ERROR, "failed to add backend '%s'", name);
 				wlr_backend_destroy(backend);
-				wlr_session_destroy(session);
+				wlr_session_destroy(multi->session);
 				free(names);
 				return NULL;
 			}
@@ -245,29 +254,30 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
 #endif
 
 	// Attempt DRM+libinput
-	session = wlr_session_create(display);
-	if (!session) {
+	multi->session = wlr_session_create(display);
+	if (!multi->session) {
 		wlr_log(WLR_ERROR, "Failed to start a DRM session");
 		wlr_backend_destroy(backend);
 		return NULL;
 	}
 
-	struct wlr_backend *libinput = wlr_libinput_backend_create(display, session);
+	struct wlr_backend *libinput = wlr_libinput_backend_create(display,
+		multi->session);
 	if (!libinput) {
 		wlr_log(WLR_ERROR, "Failed to start libinput backend");
 		wlr_backend_destroy(backend);
-		wlr_session_destroy(session);
+		wlr_session_destroy(multi->session);
 		return NULL;
 	}
 	wlr_multi_backend_add(backend, libinput);
 
-	struct wlr_backend *primary_drm =
-		attempt_drm_backend(display, backend, session, create_renderer_func);
+	struct wlr_backend *primary_drm = attempt_drm_backend(display, backend,
+		multi->session, create_renderer_func);
 	if (!primary_drm) {
 		wlr_log(WLR_ERROR, "Failed to open any DRM device");
 		wlr_backend_destroy(libinput);
 		wlr_backend_destroy(backend);
-		wlr_session_destroy(session);
+		wlr_session_destroy(multi->session);
 		return NULL;
 	}