win32.py: add argtypes and restype...
win32.py: add argtypes and restype
This is a feature of ctypes. Without these, pypy complains with
RuntimeWarning: C function without declared arguments called
RuntimeWarning: C function without declared return type called
As a side effect of specifying restypes, the return value of e.g. CreateFileA
is now implicitly converted to an instance of _HANDLE, so we also need to
change the definition
_INVALID_HANDLE_VALUE = -1
to
_INVALID_HANDLE_VALUE = _HANDLE(-1).value
Otherwise, tests for equality to _INVALID_HANDLE_VALUE in code like
def _getfileinfo(name):
fh = _kernel32.CreateFileA(name, 0,
_FILE_SHARE_READ | _FILE_SHARE_WRITE | _FILE_SHARE_DELETE,
None, _OPEN_EXISTING, 0, None)
if fh == _INVALID_HANDLE_VALUE:
_raiseoserror(name)
would now fail to detect an invalid handle, which in turn would lead to
exceptions raised with wrong errno values, like e.g.
>>> nlinks('missing.txt')
Traceback (most recent call last):
...
OSError: [Errno 9] missing.txt: The handle is invalid.
instead of the correct (as per this patch and before it)
>>> nlinks('missing.txt')
Traceback (most recent call last):
...
OSError: [Errno 2] missing.txt: The system cannot find the file specified.
