Function gravity::scandir

pub unsafe extern "C" fn scandir(
    __dir: *const c_char, 
    __namelist: *mut *mut *mut dirent, 
    __selector: Option<unsafe extern "C" fn(_: *const dirent) -> c_int>, 
    __cmp: Option<unsafe extern "C" fn(_: *mut *const dirent, _: *mut *const dirent) -> c_int>
) -> c_int