pub const Flags = struct
pub const Flags = struct {
/// * true:
/// - windows: opened with MODE.IO.ASYNCHRONOUS
/// - POSIX: O_NONBLOCK is set
/// * false:
/// - windows: opened with SYNCHRONOUS_ALERT or SYNCHRONOUS_NONALERT, or
/// not a file.
/// - POSIX: O_NONBLOCK is unset
nonblocking: bool,
}