delay_us         1150 lib/tty/key.c  getch_with_timeout (unsigned int delay_us)
delay_us         1156 lib/tty/key.c      time_out.tv_sec = delay_us / 1000000u;
delay_us         1157 lib/tty/key.c      time_out.tv_usec = delay_us % 1000000u;