On Fri, 11 Apr 2008, Scott Lovenberg wrote:
> Robert P. J. Day wrote:
> > 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.
> > > >
> >
> >
> > > 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.
> > >
> >
> > just to be pedantic here, when you say there are no such things as
> > "allocated" minors, i'm assuming that what you mean is that it's
> > always up to a loaded module to choose what minors it wants to try to
> > allocate and register, right? or, put another way, there are no such
> > things as *pre*-allocated minors. am i parsing that the right way?
> Hrm... that could be an insmod parameter, perhaps? Have you tried
> modinfo on the usb driver? It always seems fairly random to me, but
> then again, I've never paid attention to it. Also, there's 'mknod'
> and 'mknodat' in man 2, user side. I don't know if that helps at
> all.
keep in mind, i'm not talking about a specific driver in the kernel,
i'm just talking about a loadable module *in general*. and i think
rene's reply summarizes the current situation.
rday
--
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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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