> 2) Reading pwd.c I can see 'char pathname[512]' at the beginning of the main
> function. Does it mean plan9 paths are thus limited?

no.  fileservers evaludate the path one element at a time.
- erik

But at least it means that the 'pwd' function returns a wrong answer _without_warning_ when the path is longer. I tried it. This is not a nice thing. Are these limitations listed in some document?
Ruda

ps.: thanks otherwise for your other answers.