WinIOError(13, 'Access is denied')

[Adrian Buehlmann]

On 30.06.2009 22:09, Matt Mackall wrote:
> On Tue, 2009-06-30 at 20:52 +0200, Adrian Buehlmann wrote:
>> On 30.06.2009 17:40, Matt Mackall wrote:
>>> On Wed, 2009-07-01 at 01:34 +1000, Sean wrote:
>>>>>> adding test.php
>>>>>> Exception mercurial.util_win32.WinIOError: WinIOError(13, 'Access is denied') in
>>>>>>   <bound method lock.__del__ of <mercurial.lock.lock object at 0x006E3710>> ignored
>>>>> Can you manually delete the wlock file here without error? Whenever
>>>>> we've seen this error, it's been because something else (usually a virus
>>>>> scanner) decided to open the file right after we created it and when we
>>>>> went to delete it milliseconds later, it still had it open. We've fixed
>>>>> that issue with a bit of filename juggling in more recent code.
>>>> Yes, I can manually delete the wlock files.
>>>>
>>>> Perhaps this process list (from NAS) may help to id the culprit (i don't think it is a virus scanner)
>>> Not likely. Linux and other Unix-like kernels don't have this silly
>>> behavior. If one user deletes a file while another is reading it, both
>>> operations succeed. This is either caused by a weird protocol issue (SMB
>>> is quite obsolete) or by something running on your desktop.
>> Interestingly, this time it seems the silly behavior is not due to
>> Windows "kernel" itself but due to the error of lots of programs
>> on Windows failing to call WinAPI CreateFile with FILE_SHARE_DELETE on
>> parameter dwShareMode -- which enables other processes to delete or
>> rename a file while it is open (note that CreateFile is used to
>> open a file on Windows).
> 
> Oh, sure, the Windows kernel (of late) supports "deleting shared files"
> if you ask it nicely (though it's not really about sharing). The silly
> thing is that it's not the default.

CreateFile has no defaults :)

The real stupidity here seems to be in the CRT implementation by MS.

Oh, and my first PC was an Olivetti M24 with 8086 with no Hard Disk but
two 5.25" floppies (the most interesting thing at that time then
on that Computer was Turbo Pascal).