* Martin Husemann <martin@duskware.de> [2007-08-20 13:38 UTC]:
> On Mon, Aug 20, 2007 at 03:24:05PM +0200, Holger Weiss wrote:
> > I should've mentioned that PPPOEGETSESSION evaluates to 3223349616 on
> > _both_ sides.  That is, replacing the PPPOEGETSESSION macro with the
> > hardcoded value 3223349616UL within both the ioctl(2) call and
> > pppoe_ioctl()'s switch case doesn't change anything.
> 
> What does ktrace say?
> 
>   4883      1 pppoectl CALL  ioctl(3,PPPOEGETSESSION,0xffffffffffffc694)
>   4883      1 pppoectl GIO   fd 3 wrote 32 bytes
>        "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
>   4883      1 pppoectl GIO   fd 3 read 32 bytes
>        "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\^C\0\0\v\M-W\0\0\0\^U\0\0\0\0"
>   4883      1 pppoectl RET   ioctl 0, 3223349616/0xc0206970
> 
> is what I get.

I get:

     568      1 pppoectl CALL  ioctl(3,PPPOEGETSESSION,0xffffffffffffc4c0)
     568      1 pppoectl GIO   fd 3 wrote 32 bytes
         "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
     568      1 pppoectl RET   ioctl -1 errno 25 Inappropriate ioctl for device

> Corresponding kdump -n:
> 
>   4883      1 pppoectl CALL  ioctl(3,0xc0206970,0xffffffffffffc694)
>   4883      1 pppoectl GIO   fd 3 wrote 32 bytes
>        "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
>   4883      1 pppoectl GIO   fd 3 read 32 bytes
>        "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\^C\0\0\v\M-W\0\0\0\^U\0\0\0\0"
>   4883      1 pppoectl RET   ioctl 0, 0xc0206970

     568      1 pppoectl CALL  ioctl(3,0xc0206970,0xffffffffffffc4c0)
     568      1 pppoectl GIO   fd 3 wrote 32 bytes
         "pppoe0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
     568      1 pppoectl RET   ioctl -1 errno 25

Holger