Re: USB API, ioctl's and libusb

[DervishD <lkml@dervishd.net>]

    Hi Johannes :)

 * Johannes Erdfelt <johannes@erdfelt.com> dixit:
> On Wed, Jan 26, 2005, DervishD <lkml@dervishd.net> wrote:
> >  * Oliver Neukum <oliver@neukum.org> dixit:
> > > You are supposed to use libusb.
> >     That's irrelevant, the program I was trying to fix uses libusb.
> > My question is about the preferred kernel interface, 'cause I don't
> > know if it's the ioctl one or the URB one (well, I'm calling 'URB'
> > interface the API that is implemented using URB's inside the kernel).
> ioctl() calls are for userspace only.

    I was pretty sure of that. My doubt was the other way round. I
was assuming that the functions in <linux/usb.h> were syscalls, that
they're not.

> It just so happens there is an ioctl() call that provides an URB like
> interface and an ioctl() call that provides a synchronous call to do
> a control message.

    Didn't knew about that... Thanks a lot for the info!. Is there
any documentation available for the ioctl USB interface to the
kernel? Any API guide or something like that?

    Thanks :)
     
    Raúl Núñez de Arenas Coronado

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