On Aug 23, 07 12:00:39 +0300, Daniel Stone wrote: > > > If you have ioctl number 32, your next free one is 43, and you want to > > > change the semantics of UPDATE_WINDOW, then you rename 32 to > > > UPDATE_WINDOW_OLD, create UPDATE_WINDOW as 43 with the new structure, > > > and handle both cases. > > > > I consider this giving headaches. > > I never had any similar issues with a tag-based approach. > > The problem there comes with the added complexity of parsing all the > data.
Maybe I'm a bit biased (had an Amiga for a long time, and this was the base argument parsing for OS routines), but it worked astonishingly well. > > If every tag is int32 and its parameter int32 as well, this isn't too > > problematic. Question is whether everything needed can be represented in > > 32 bit values, strings are a completely different concept and don't > > match well here, as pointers are probably difficult to handle over the > > user land / kernel barrier... > > Easy to use, hard to use right. Right. Matthias -- Matthias Hopf <[EMAIL PROTECTED]> __ __ __ Maxfeldstr. 5 / 90409 Nuernberg (_ | | (_ |__ [EMAIL PROTECTED] Phone +49-911-74053-715 __) |_| __) |__ R & D www.mshopf.de ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
