How to track the flow of raw (character) devices on Unix?

Question

I am trying to trace what is happening on a raw (character) device on a Unix system (for example:) /dev/tty.basebandfor DEBUG purposes.

I am thinking of creating a deamon that:

• after starting rename /dev/tty.basebandto /dev/tty.baseband.old.
• create raw node /dev/tty.baseband

• create two threads:

• Topic 1: reading a /dev/tty.baseband.oldrecord in/dev/tty.baseband

• Topic 2: reading a /dev/tty.basebandrecord in/dev/tty.baseband.old

This will work a bit like the MITM process. I wonder if there is a “standard” way to do this.

Answer 1

Nevermind I found how to do this. The path to the following:

• create process
• create a new pseudo-terminal, open / dev / ptmx
• grantpt unlockpt
• intecept
• ,

, - :

http://fabiensanglard.net/cellphoneModem/index2.php