STINNER Victor added the comment:
It looks like O_TMPFILE is supported by tmpfs (3.11), ext3 (3.11), ext4 (3.11),
XFS (3.15). It looks like BTRFS will also support the O_TMPFILE:
https://btrfs.wiki.kernel.org/index.php/Project_ideas#Implement_O_TMPFILE_support
--
It looks like os.open() fails with OSError(95, 'Operation not supported') if
the filesystem of the directory doesn't support TMPFILE. In this case, a
fallback to the current implementation should be enough. I don't think that we
need to remember that the directory doesn't support TMPFILE. The directory may
be on a different filesystem at the next call.
haypo@smithers$ ~/prog/python/default/python
Python 3.5.0a0 (default:5e98a50e0f55, May 16 2014, 10:44:10)
>>> import tempfile
>>> tempfile._O_TMPFILE
4259840
>>> f=tempfile.TemporaryFile(dir='.')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/haypo/prog/python/default/Lib/tempfile.py", line 507, in
TemporaryFile
fd = _os.open(dir, flags, 0o600)
OSError: [Errno 95] Operation not supported: '.'
haypo@smithers$ df .
Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
192.168.0.42:/test 96G 9,1G 83G 10% /home/haypo/nfs
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<http://bugs.python.org/issue21515>
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