Function dw_sys::dwarf_getfuncs

pub unsafe extern "C" fn dwarf_getfuncs(
    cudie: *mut Dwarf_Die, 
    callback: Option<unsafe extern "C" fn(_: *mut Dwarf_Die, _: *mut c_void) -> c_int>, 
    arg: *mut c_void, 
    offset: ptrdiff_t
) -> ptrdiff_t