Eryk Sun <eryk...@gmail.com> added the comment:
For me in Windows 10, os.listdir(u"C:\\Temp") uses the same sequence of WINAPI
and NT system calls in 2.7 and 3.6.
Setup the query for all files ("*"), and return the first matching entry:
FindFirstFileW
FindFirstFileExW
NtOpenFile(
ObjectAttributes=(
ObjectName="\??\C:\Temp\",
Attributes=OBJ_CASE_INSENSITIVE)
DesiredAccess=(
SYNCHRONIZE |
FILE_LIST_DIRECTORY),
ShareAccess=(
FILE_SHARE_READ |
FILE_SHARE_WRITE |
FILE_SHARE_DELETE),
OpenOptions=(
FILE_DIRECTORY_FILE |
FILE_SYNCHRONOUS_IO_NONALERT |
FILE_OPEN_FOR_BACKUP_INTENT))
NtQuerDirectoryFileEx(
FileInformationClass=FileBothDirectoryInformation,
QueryFlags=SL_RETURN_SINGLE_ENTRY,
FileName="*")
Repeat for the remaining entries:
FindNextFileW
Return the next entry from a 4 KiB buffer. If the buffer is
empty, refill it with the following call, until the query is
exhausted (i.e. STATUS_NO_MORE_FILES):
NtQuerDirectoryFileEx(
FileInformationClass=FileBothDirectoryInformation,
Length=4096)
Unfortunately, many NT status codes map to ERROR_ACCESS_DENIED (5). If it's
STATUS_ACCESS_DENIED (0xC0000022), then probably NtOpenFile failed. Try
checking the last NT status value with ctypes. For example:
>>> import os, ctypes
>>> ntdll = ctypes.WinDLL('ntdll')
>>> ntdll.RtlGetLastNtStatus.restype = ctypes.c_ulong
>>> try:
... os.listdir(u'C:\\Users\\Administrator')
... except:
... print(hex(ntdll.RtlGetLastNtStatus()))
...
0xc0000022
Do you have any anti-malware programs running? If so, try disabling them. They
can hook APIs or attach to the I/O stack with a filter driver (e.g. to deny an
I/O request that's disallowed by a rule). If disabling your anti-malware
software allows access, then you'll need to set a rule to grant access to
Python 3.
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36646>
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