STINNER Victor <victor.stin...@haypocalc.com> added the comment:

Antoine asked me why not using a buffer of MAX_PATH+1 (instead of a dynamic 
buffer size). I don't know, I just copied/pasted the code from Python2. Extract 
of getcwd() manpage:

   Note that on some systems, PATH_MAX may not be a compile-time
   constant; furthermore, its value may depend  on  the file system,
   see pathconf(3).

It's maybe to support strange OS like Hurd :-) (Hurd has no hardcoded limits).

Most of the time, the first realloc() should be enough.

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<http://bugs.python.org/issue9246>
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