Expand description
Speeds for use with Termios::set_speed, Termios::set_input_speed,
and Termios::set_output_speed.
Unlike in some platforms’ libc APIs, these always have the same numerical
value as their names; for example, B50 has the value 50, and so on.
Consequently, it’s not necessary to use them. They are provided here
because they help identify speeds which are likely to be supported, on
platforms and devices which don’t support arbitrary speeds.