bug in large file writes, 2.x and 3.x

[Terry Reedy]

On 6/17/2011 3:03 PM, Ethan Furman wrote:
> Windows platform (XP Pro, SP2).
>
> This works fine on local drives, but on network (both 2003 Server, and
> Samba running on FreeBSD) the following produces an error:
>
> --> data = '?' * 119757831 # use b'?' if on 3.x
> --> test = open(r's:\junk.tst', 'wb')
> --> test.write(data)
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> IOError: [Errno 22] Invalid argument

Just curious, how big is 'large'?
Rather, how bit to get an error?

> Any ideas on whether this is Python or MS Windows? (Personally, I'm
> betting on Windows).

Python should not know the difference betweeen 'c:xxx' and 's:xxx'. The 
error comes from Windoes. But 100 million bytes does not seem really 
large for today's systems.

-- 
Terry Jan Reedy