typedef int (interp_suspend_ftype) (void *data);
typedef int (interp_prompt_p_ftype) (void *data);
typedef int (interp_exec_ftype) (void *data, const char *command);
-typedef int (interp_command_loop_ftype) (void *data);
+typedef void (interp_command_loop_ftype) (void *data);
struct interp_procs
{