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Message-ID: <7d40d7190601300323t1aca119ci@mail.gmail.com>
Date: Mon, 30 Jan 2006 12:23:14 +0100
From: Aritz Bastida <aritzbastida@gmail.com>
To: Antonio Vargas <windenntw@gmail.com>
Subject: Re: Right way to configure a driver? (sysfs, ioctl, proc, configfs,....)
Cc: linux-kernel@vger.kernel.org, Greg KH <greg@kroah.com>
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Thank you Antonio and Greg
But I still have one question pending:

> >
> > 3.- Actually the most difficult config I must do is to pass three
> > values from userspace to my module. Specifically two integers and a
> > long (it's an offset to a memory zone I've previously defined)
> >
> > struct meminfo {
> >         unsigned int      id;         /* segment identifier */
> >         unsigned int      size;     /* size of the memory area */
> >         unsigned long   offset;   /* offset to the information */
> > };
> >
> > How would you pass this information in sysfs? Three values in the same
> > file? Note that using three different files wouldn't be atomic, and I
> > need atomicity.
> >

I guess I could pass three values on the same file, like this:
$ echo "5  1000  500" > meminfo

I know that breaks the sysfs golden-rule, but how can I pass those
values _atomically_ then? Having three different files wouldn't be
atomic...

Regards
Aritz