-const char *sd_bus_message_get_selinux_context(sd_bus_message *m);
-const char *sd_bus_message_get_comm(sd_bus_message *m);
-const char *sd_bus_message_get_tid_comm(sd_bus_message *m);
-const char *sd_bus_message_get_exe(sd_bus_message *m);
+int sd_bus_message_get_selinux_context(sd_bus_message *m, const char **r);
+int sd_bus_message_get_comm(sd_bus_message *m, const char **r);
+int sd_bus_message_get_tid_comm(sd_bus_message *m, const char **r);
+int sd_bus_message_get_exe(sd_bus_message *m, const char **r);
+int sd_bus_message_get_cgroup(sd_bus_message *m, const char **r);