pub unsafe extern "C" fn gfuds_c(
udfuns: Option<unsafe extern "C" fn(_: f64, _: *mut f64)>,
udfunb: Option<unsafe extern "C" fn(_: Option<unsafe extern "C" fn(_: f64, _: *mut f64)>, _: f64, _: *mut i32)>,
relate: *mut i8,
refval: f64,
adjust: f64,
step: f64,
nintvls: i32,
cnfine: *mut _SpiceCell,
result: *mut _SpiceCell
)