pub unsafe extern "C" fn libssh2_sftp_readdir_ex(
    handle: *mut LIBSSH2_SFTP_HANDLE,
    buffer: *mut c_char,
    buffer_len: size_t,
    longentry: *mut c_char,
    longentry_len: size_t,
    attrs: *mut LIBSSH2_SFTP_ATTRIBUTES
) -> c_int