STINNER Victor <vstin...@redhat.com> added the comment:

man get_current_dir_name():

       get_current_dir_name()  will  malloc(3) an array big enough to hold the
       absolute pathname of the current working directory.  If the environment
       variable  PWD is set, and its value is correct, then that value will be
       returned.  The caller should free(3) the returned buffer.

Oh sorry, I missed that part.

In this case, we should expose os.get_current_dir_name() using this function. 
But it's a glibc extension:

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       get_current_dir_name():
              _GNU_SOURCE

I'm not sure about adding shutil.get_current_dir_name() which would use 
os.get_current_dir_name(), or reimplement it in pure Python.

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<https://bugs.python.org/issue1154351>
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