Messages in this thread | | | Date | Sat, 6 Feb 1999 13:04:06 -0800 | From | "D.A. Harris" <> | Subject | Re: accessing media_changed() for CDROMs |
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On Thu, Feb 04, 1999 at 10:46:11PM +0100, Jens Axboe wrote: > > The correct way to use the ioctl, would be something like this : > > changed = ioctl(drive, CDROM_MEDIA_CHANGED, CDSL_CURRENT); > > And that is the only way you can do it. There's no way you can retrieve > the info by trying to call media_changed() - userspace programs can't > access kernelspace functions like that. Hey, that's one of the reasons > for ioctl! >
Ok. Thanks for the help. Course how is changed going to be anything other than 0? ioctl only returns 0 if ok or -1 on error. So it doesn't appear that would work. No information on wether the CD was changed will be returned. The third argument is ioctl() by convention char*, and as far as I can tell the only way to get any information from the kernel. So it would still appear that I need acces to the Uniform cdrom data structures defined in <linux/cdrom.h> which are only available if I #define __KERNEL__
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Dale Harris <rodmur@csuchico.edu> http://www.ecst.csuchico.edu/~rodmur/ GPG-Fingerprint: 8849 BC4F 3DF0 F0A8 3355 E94C 537C 3E1D EEE5 2AB2 |+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|+|
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