linux-kernel - Re: ldd scull

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Message-ID: <1283648515.1741.8.camel@bencharluo-laptop>
Date:	Sun, 05 Sep 2010 09:01:55 +0800
From:	runcoderen <runcoderzhcn@...il.com>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: ldd scull_load question

yes, you do!

there is another question confused me.
I have seem the command in the scull.c:
int scull_major = SCULL_MAJOR;and so on.

module_param(scull_major, int, S_IRUGO); and so on.

if we don't do "./scull_load scull_major" command.

we just use "./scull_load"

it will make scull_major = SCULL_MAJOR default?

在 2010-09-04六的 17:43 -0700，Randy Dunlap写道：
> On Sun, 05 Sep 2010 08:35:14 +0800 runcoderen wrote:
> 
> > hi all:
> > I am reading ldd(3rd).
> > when I read the scull_load part.
> > I can't understand some special sentences in the scripts as follows:
> > 
> > /sbin/insmod ./$module.ko $* || exit 1
> > 
> > why we add $* and || exit 1 after /sbin/insmod ./$module.ko?
> > 
> > can anyone help me to understand?
> 
> "$*" passes all parameters of the script to the module as module parameters.
> 
> "insmod module.ko || exit 1"
> 
> means "if insmod is successful (no error), then the command is finished,
> otherwise exit with an error code of 1."
> 
> Does that help?
> 
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***

-- 

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