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> Just catch any OSError?
If possible, I would prefer to not retry O_TMPFILE each time if the kernel version does not support the flag.
Pseudo-code:
--
if o_tmpfile_supported:
 try:
 fd = os.open(dir, os.O_TMPFILE | ...)
 except IsADirectoryError:
 # Linux kernel older than 3.11 ignores O_TMPFILE flag
 o_tmpfile_supported = False
 except OSError:
 # the filesystem doesn't support O_TMPFILE
 pass
 else:
 return io.open(fd, ...)
 # fallback to unsafe but portable implementation
# current code generating a name and using unlink
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