Re: Socketcan correct way to bootup...

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 07/09/2014 12:39 PM, gianluca wrote:
> I was wondering if there is some "Offical" way to bring-up a socketcan
> interface during bootup of a Linux System. Actually I write a simple
> script BEFORE running my application in this way:

Depends on your Distribution/init system.

> # run.sh 125000 75 can0
> 
> [ run.sh ]
> #!/bin/sh
> BITRATE=$1
> SAMPLE=".$2"
> INTERFACE=$3
> ip link set $INTERFACE up type can bitrate ${BITRATE} sample-point
> ${SAMPLE}
> ip -details link show $INTERFACE
> while [ true ];
> do
>     ./myapplication
> done
> 
> Are there some guidelines on how to approach this startup? i.e. I was
> thinking about similar to ifup /etc/network/interface but with the
> addendum of the bitrate and sample point...

On recent Debian based Distris you can use ifup/ifdown for CAN
interfaces. See the man page of interfaces.

If you use busybox's ifup/ifdown you can fall back to the "inet manual"
mode and specify /sbin/ip commands to configure and up/down your
interface. On systemd you can add a service that starts CAN and runs
before your actual program.

Marc

BTW: you probably want to integrate your application into the automatic
startup via an init script or in new designs with systemd...and _not_
start it by hand.

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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