Function dwfl_getdwarf 

pub unsafe extern "C" fn dwfl_getdwarf(
    arg1: *mut Dwfl,
    callback: Option<unsafe extern "C" fn(*mut Dwfl_Module, *mut *mut c_void, *const i8, u64, *mut Dwarf, u64, *mut c_void) -> i32>,
    arg: *mut c_void,
    offset: isize,
) -> isize