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Message: [QUOTE="Sergei Organov, post: 1882949"] I've actually meant to take strace in source code and modify it for particular purpose. The fact that it almost can do it in unmodified form is quite impressive though. Provided I have port name, say, /dev/ttyM0, and have running application: osv@osv ~$ fuser /dev/ttyM0 /dev/ttyM0: 5134 osv@osv ~$ ls -l /proc/5134/fd | grep /dev/ttyM0 lrwx------ 1 osv osv 64 2006-05-29 15:33 8 -> /dev/ttyM0 osv@osv ~$ so I need to track fd #8 of the process with pid 5134. Guess one can attach to a running process as gdb does it. Alternatively, if the process to be sniffed sporadically opens/closes the port at run-time, it is required to track open()/close() syscalls as well as read()/write() ones, I think. Overall, seems not that trivial but doable. [/QUOTE]