sending extra information to leex or yecc? (or how to know the name of the file I'm parsing in them)

[Mariano Guerra]

the subject is rather long but that's what I need.

I need to get the name of the file I'm parsing in leex or yecc it
doesn't matter in which.

If there isn't a way to get that, then is there a way to pass extra
information to leex or yecc when I start running them with a file?