[oclug] how to get a process's tty

[Patrick Smith]

Francis J. A. Pinteric wrote:
> Look at the /proc/<pid>/fd directory. Using an `ls -l' command on that
> directory will give you all the file descriptors used by that process.
> I'll leave it as an exercise for the reader to extract the device name.

This would usually work, but not always.  Provided one can identify the 
ttys in the list, of course.

A process need not have its controlling terminal open.