[issue2722] os.getcwd fails for long path names on linux

[Matthias Urlichs]

Matthias Urlichs <smurf at smurf.noris.de> added the comment:

MAX_PATH is a compile time constant which, like FD_BITS for select(),
may be too small for the system you're ultimately running on.

Using that as default initial size is OK, but handling ERANGE is still a
very good idea.

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nosy: +smurfix

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