[Bug 1001466] /dev/null serial driver

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--- Comment #3 from Sergei Gavrikov <sergei.gavrikov@gmail.com> 2012-02-15 20:45:18 GMT ---
On Comment #0
> Try to mimick /dev/null. (inspired by loop serial driver.) Comments
> welcome, maybe the semantics aren't close enough to Un*x but it should
> do the job for most cases. The doc may need to be rewritten?

It seemed to me your interpretation of /dev/null will arise some
confusions for some users. Below are mine.

Mess #1

  I would avoid the same mimic (and naming). In UNIX-like operating
  systems, /dev/null is a special *file* and not a serial device.

  % stty -aF /dev/null
  stty: /dev/null: Inappropriate ioctl for device

As you can see /dev/null is not some terminal line (serial device).
Well, eCos != *nix, but, I would avoid the ability to configure the
/dev/null as a serial device under eCos.

Mess #2

  A read on /dev/null would not block process (thread), it does return
  EOF, and you offer in your documentation to enter an ability of the
  blocking read on /dev/null as an option.

Mess #3

  IMO, if anyone will see those words together in CDL (I mean 'serial'
  and 'null'), under eCos dev/serial/null, then he would think, Great!
  There is 'nullmodem' device in eCos! Come check my guess

    http://www.google.com/search?q=%2Bserial+%2Bnull 

  And after reading your documentation, they will think, Nope! They
  provide something very special (special null device :-)

BUT

I do not want to break your idea. IMHO, the main mess here is naming and
your free interpretation of /dev/null. You try to implement some serial
device like a "tear off" nullmodem, but what is bad with a "nullmodem"
abstraction for your purposes? And eCos serial loop driver (as you could
see) is a half of nullmodem itself.

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