On Fri, 11 Apr 2008, Rene Herman wrote:
> On 11-04-08 11:56, Robert P. J. Day wrote:
>
> > i know well enough that, if i write and load a driver that
> > allocates a device major number and one or more minor numbers, i
> > can see the allocated major number via /proc/devices. but is
> > there a userspace way to see the minor number(s)? or, as LDD3
> > implies, it's my job to just *know* what those would have been?
> > thanks.
>
> Just idle interest -- I see the lowercase "I" more and more these
> days. Is it a kiddospeak thing or is that actually finding its way
> into the English language?
just FYI, i long ago gave up on uppercase for the most part since
doing that makes a *huge* difference in avoiding carpal tunnel
syndrome. constantly reaching for the shift keys represents a
noticeable amount of stress on the wrists. when i stopped doing that,
it made a significant difference. your mileage might vary, of course.
:-)
> Historically, no way. The driver just gets everything for its
> registered major and has to switch on minor itself. That is, no such
> thing as "allocated" minors as far as the system is concerned.
i had suspected as much, i just wanted to make sure.
> Newishly though, we have class_create() and device_create() which do
> provide minors with more of a role. For exaple, if you look at
> /sys/class/mem, you see subdirectories according to its minors.
>
> The "historic" driver is far from obsolete though, so the best
> answer is "if you're lucky, but don't count on it".
fair enough, that's pretty much the answer i was looking for. thanks.
more dumb questions coming shortly.
rday
--
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry:
Have classroom, will lecture.
http://crashcourse.ca Waterloo, Ontario, CANADA
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