Message 140806 - Python tracker

Message140806

Author	superbobry
Recipients	neologix, rosslagerwall, superbobry
Date	2011-07-21.11:02:51
SpamBayes Score	0.0032193284
Marked as misclassified	No
Message-id	<1311246172.63.0.917851479965.issue12556@psf.upfronthosting.co.za>
In-reply-to

Content
> Do you have an example of a /proc entry with st_size == 0 that can be mmapped > (mapping /proc/sys/debug/exception-trace fails with EACCESS)? Yes, I've ran into the issue, while trying to mmap /proc/xen/xsd_kva, which is an interface to XenBus [1]. Unfortunately, I'm not aware of any other cases. By the way, I've checked mmap(2) manpage -- it looks like the C-version has nothing against mmaping 0-sized files, Why does Python's `mmap` still checks file size? [1] http://wiki.xensource.com/xenwiki/XenBus

Content

> Do you have an example of a /proc entry with st_size == 0 that can be mmapped 
> (mapping /proc/sys/debug/exception-trace fails with EACCESS)?
Yes, I've ran into the issue, while trying to mmap /proc/xen/xsd_kva, which is an 
interface to XenBus [1]. Unfortunately, I'm not aware of any other cases. 

By the way, I've checked mmap(2) manpage -- it looks like the C-version has nothing 
against mmaping 0-sized files, Why does Python's `mmap` still checks file size?

[1] http://wiki.xensource.com/xenwiki/XenBus

History
Date	User	Action	Args
2011-07-21 11:02:52	superbobry	set	recipients: + superbobry, neologix, rosslagerwall
2011-07-21 11:02:52	superbobry	set	messageid: <1311246172.63.0.917851479965.issue12556@psf.upfronthosting.co.za>
2011-07-21 11:02:52	superbobry	link	issue12556 messages
2011-07-21 11:02:51	superbobry	create