Two applications listening one serial port

In a message on Wed, 01 Feb 2006 20:59:17 +0100, wrote :

So, the weather station is sending a stream of data in some format 'blindly' eg: wind speed, temperature, etc. as little message packets over and over again?

tee is not really designed for what you are doing.

I suspect not, since things are not working well!

You probably need to create a special program that creates two named pipes (man 3 mkfifo) and reads from the serial port and writes to these two pipes. Tee wants to write to files, not pipes. Your little program will look alot like tee, but use a different sort of file open (create and open named pipes). A more complex version would take the two program pathnames as arguments and create unnamed pipes using popen() (man popen) with the two weather programs.

Pseudo code would be something like:

* Fifo (pipe) tee *

tee(string tty, string pipe1, string pipe2) { mkfifo(pipe1); mkfifo(pipe2); p1 = open(pipe1,"w"); p2 = open(pipe2,"w"); tt = open(tty,"r"); forever { read(tt,buffer); write(p1,buffer); write(p2,buffer); } }

* tee using popen() *

popentee(string tty,string prog1,string prog2) { tt = open(tty,"r"); p1 = popen(prog1,"w"); p2 = popen(prog2,"w"); forever { read(tt,buffer); write(p1,buffer); write(p2,buffer); } }

The 'forever' loops should have some break out method, eg a signal or something (man signal).

You explained things well enough.