Re: How to detect whether media is present in a reader?

[Michael Hamilton <michael@actrix.gen.nz>]

Thanks for the pointers.  However it has just occurred to me -
and please correct me if I'm wrong - that frequently polling flash 
media might prematurely wear it out.  I guess the media should 
only be polled when the user tries to access it - something like 
the approach taken by submount - so I'm probably going to look 
at virtual file systems (maybe using the fuse library).


On Sat, 12 Jun 2004 09:01, David Zeuthen wrote:
> >...
> > If I had a simple/efficient way to poll a device's media 
> > insertion state, I think my script could then fully automate 
> > almost all aspects of desktop integration of usb storage.
> > 
> > Thanks.
> > 
> 
> Hi, have you looked at the HAL project at http://hal.freedesktop.org and
> gnome-volume-manager which accomplishes this task on Linux 2.6 kernels?
> (It's so much easier on 2.6 thanks to sysfs). The idea is that it's
> possible to port this to other kernels which is more or less a
> requirement for desktop projects link GNOME or KDE. The IPC used to
> communicate with the desktop session is D-BUS.
> 
> Regarding media detection I've found that doing the equivalent of
> 'blockread --rereadpt /dev/sda' every, say, 2 seconds is a good way of
> polling for media. In HAL it's straightforward to blacklist or whitelist
> devices where this causes trouble.
> 
> Hope this helps,
> David
> 
> 


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