Luís Henriques wrote: > On Wednesday 21 November 2001 11:20 am, Martin Maletinsky wrote: > > If 'correct number of bytes' means the number of bytes you requested to > > copy, the return value indicates a failure of copy_to_user(). As mentioned, > > the return value of copy_to_user() indicates the number of bytes that have > > *not* been transfered, i.e. success is indicated by a return value 0. > > Ok, so copy_to_user didn't succeded... this means that it cannot be used to > write to a CS? Or it's more likely that I'm using it uncorrectly? It seems likely to me, that it didn't succeed because the CS is write protected (i.e. the attempt to write to the CS causes a page fault, which can not be handled correctly due to the write protection). > > > I'm starting to look at the kernel memory management... probably I'll have to > change some permissions first... I think so. However, I don't know what the side effects of such a change will be. regards Martin -- Supercomputing System AG email: maletinsky@scs.ch Martin Maletinsky phone: +41 (0)1 445 16 05 Technoparkstrasse 1 fax: +41 (0)1 445 16 10 CH-8005 Zurich -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
