Thread: Passing serial settings from pseudoterminal to physical port

Hi,

I have a daemon that redirects data from physical serial port (/dev/ttySx) to different data consumer processes using pseudo-terminals (/dev/pts/X). In the daemon I can redirect the data from serial port to any of my pseudo-terminals with dup2() function. But is there a way to do something similar to serial port settings? I mean that if the data consumer changes the pseudo-terminal settings with ioctl or tcsetattr(), I would like get the same changes to the physical serial port.

Any advices are greatly appriciated, thanks in advance.

Thanks for your reply! Yes, I think polling would be one option, but as you say it wastes CPU time and my CPU time is limited.

Unfortunately I have very little kernel programming experience so that option does not sound very tempting either.

I think third option would be to create a communication method between data consumers and the daemon. This way a data consumer could notify the daemon when changes have been made. This would remove the need for polling. I was hoping for a simpler solution though...