Re: [Xenomai-help] newby question, can/socket stuff

[Wolfgang Grandegger <wg@domain.hid>]

roland Tollenaar wrote:
> Hi,
> 
> 
> You must all be getting very exasperated with me. :)

Why, you seem to be exasperated ;-).

>> > I know too little of the basic socket programming. Not even sure my
>> > wording in the previous sentence is capturing the correct area of
>> > ignorance.
>>
>> There are plenty text books on BSD socket programming and the rational
>> behind it.
> These are the ones I need. But without the time to get hold of them I
> will have to search the net.
> 
>> > ret = rt_dev_ioctl(can_fd, SIOCGIFINDEX, &ifr);
>> >
>> > and
>> > ret = rt_dev_ioctl(can_fd, SIOCSCANBAUDRATE, &ifr);
>> >
>> > But exactly what is happening is beyond me at the moment.
>>
>> SIOCGIFINDEX gets the interface index for a named device and
>> SIOCSCANBAUDRATE allows to set the baudrate. The RT-Socket-CAN utilities
> 
> My email must have been very bad. I realize roughly what SIOCGIFINDEX
> and  SIOCSCANBAUDRATE do. This is described very nicely in your
> documentation or rather the documentation that refers to you and which
> Gilles kindly also pointed out to me but which I already knew about.
> 
> No my problem is with the
> rt_dev_ioctl
> 
> part. I would like to have a better understanding of the part that
> these functions play.
> 
>> are now even hyperlinked with the API doc (still not 100% perfect yet) 
>> e.g.:
>>
>> http://www.xenomai.org/documentation/trunk/html/api/rtcanconfig_8c-example.html 
>>
> 
> And by tremendous chance this was also the code I was studying when I
> posted my email.
> 
> Sorry to be such a nuisance. I'll see if I can google for some info on
> rt_dev_ioctl.

Unfortunately, there is a problem with hyperlinking rt_dev_ioctl() in 
Doxygen :-(.

Wolfgang.

> 
> Regards,
> 
> Roland
> 
> 
>>
>> > Now I can obviously try to copy like a chinaman (no disrespect
>> > intended!) and not understand what I am doing but it is not really a
>> > mode of operation I relish.
>> >
>> > I have briefly tried to locate the rt_dev_ioctl back to a xenomai
>> > header but have not managed to trace it yet.
>>
>> > Is it defined in the standard linux ioctl headers? Where can I find
>> > some info on what arguments these functions are passed etc?
>>
>> Hm, try:
>>
>> $ cd <xenomai-root>
>> $ find . -name '*.[ch]' | xargs grep SIOCSCANBAUDRATE
>>
>> > Much appreciated.
>>
>> Wolfgang.
>>
> 
>