Eryk Sun <[email protected]> added the comment:
When an open attempts to access a directory as data, the error code from WinAPI
CreateFileW is ERROR_ACCESS_DENIED (5), which maps to C EACCES and thus raises
Python PermissionError.
Python's io.FileIO() type could handle an EACCES error in Windows by checking
for a directory. There's a race condition to consider in which an inaccessible
file is replaced by a directory, but that seems to be a trivial concern.
io.FileIO() could also use the undocumented _O_OBTAIN_DIR (0x2000) open flag.
This opens with backup semantics, which allows opening directories. Then, as
already implemented in POSIX, fail with EISDIR if a directory is opened. For
example:
>>> fd = os.open('C:/Temp', 0x2000)
>>> stat.S_ISDIR(os.fstat(fd).st_mode)
True
----------
components: +IO
nosy: +eryksun
type: -> behavior
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<https://bugs.python.org/issue43095>
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