windowsApiWriteMarker

fn windowsApiWriteMarker(io: Io) WindowsApiError!void {
    // Write the marker that we will use to find the beginning of the progress when clearing.
    // Note: This doesn't have to use WriteConsoleW, but doing so avoids dealing with the code page.
    const terminal = global_progress.terminal;
    var write_console = windows.CONSOLE.USER_IO.WRITE(.WideCharacter);
    const buffer = [1]windows.WCHAR{windows_api_start_marker};
    switch ((try io.operate(.{ .device_io_control = .{
        .file = terminal,
        .code = windows.IOCTL.CONDRV.ISSUE_USER_IO,
        .in = @ptrCast(&write_console.request(null, 1, .{
            .{ .Size = @sizeOf(@TypeOf(buffer)), .Pointer = &buffer },
        }, 0, .{})),
    } })).device_io_control.u.Status) {
        .SUCCESS => {},
        .CANCELLED => unreachable,
        else => |status| return windows.unexpectedStatus(status),
    }
}