New session interface.

session/session.c

@@ -0,0 +1,38 @@
+#include <stddef.h>
+
+#include <wlr/session.h>
+#include "session/interface.h"
+
+static const struct session_interface *ifaces[] = {
+#ifdef HAS_SYSTEMD
+	&session_logind_iface,
+#endif
+	NULL,
+};
+
+struct wlr_session *wlr_session_start(void) {
+	const struct session_interface **iter;
+
+	for (iter = ifaces; *iter; ++iter) {
+		struct wlr_session *session = (*iter)->start();
+		if (session) {
+			return session;
+		}
+	}
+
+	return NULL;
+}
+
+void wlr_session_finish(struct wlr_session *session) {
+	session->iface.finish(session);
+};
+
+int wlr_session_open_file(struct wlr_session *restrict session,
+	const char *restrict path) {
+
+	return session->iface.open(session, path);
+}
+
+void wlr_session_close_file(struct wlr_session *session, int fd) {
+	session->iface.close(session, fd);
+}