Re: linsocketcan

Re: linsocketcan

[Marc Kleine-Budde]

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Hey Robert,

please use the linux-can mailinglist (Cc'ed). Don't post HTML mails there.

On 11/20/2012 02:05 PM, Robert wrote:
> Hi,
> 
> I try use libsocketcan  in my android application to work with CANbus
>  (ti_HECC ) in HMI device TH-1535  based on ARM3517 Sitara .
> 
> OS Android IceCream  Linux kernel 2.6.37
> 
>  
> 
> Add libsocketcan.c  to my  jni  folder and build library
>   libsocketcan.so  use  ndk-build (all ok no errors)
> 
>  
> 
> If  use *can_set_bitrate**(“can0”, 125000),*function*send_mod_request
> return -1 (errno = 1,  err->error = 2).*

If the libsocketcan isn't buggy here, and errno equals 1, you should
have a look at the errno definition[1]. An errno of 1 means "Operation
not permitted". In non Android Linux systems you need to be the root
user to set the bitrate.

[1] http://lxr.free-electrons.com/source/include/asm-generic/errno-base.h#L4

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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Re: linsocketcan

[Marc Kleine-Budde]

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Hello Robert,

please keep the mailinglist on Cc.

On 11/20/2012 03:35 PM, Robert wrote:
> OS  Android on my device is rooted. 
> I know the error codes and so I asked what may have caused the error No. 1.

A rooted devices doesn't mean that every process runs as root. Have you
started your program as root?

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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Re: linsocketcan

[Marc Kleine-Budde]

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Hello,

for the protocol, problem solved:

On 11/21/2012 08:59 AM, Robert wrote:
>> A rooted devices doesn't mean that every process runs as root. Have you
>> started your program as root?

> All ok, CANbus is Up. Thanks for suggestions.

\o/

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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