view hgext/__init__.py @ 14345:bf9a105aed0a

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.

# placeholder