linux-kernel - Re: Best method for sending messages to user space?

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Message-ID: <48FE3A34.5040105@freescale.com>
Date:	Tue, 21 Oct 2008 15:23:16 -0500
From:	Timur Tabi <timur@...escale.com>
To:	Dan Williams <dan.j.williams@...el.com>
CC:	linux-kernel@...r.kernel.org, Kumar Gala <kumar.gala@...escale.com>
Subject: Re: Best method for sending messages to user space?

Dan Williams wrote:

> fd = open("/sys/block/md0/md/array_state");
> do {
> 	read(buf, fd, len);
> 	act_on_message(buf);
> 	select(...); /* wait for next sysfs_notify event */
> 	lseek(fd, 0, SEEK_SET); /* seek back so we can read the new state */
> } while (1);

I meant from the kernel side.  I added a call to sysfs_notify(), and I didn't
see any sysfs entries being created, so I presume I need to set up sysfs before
I call sysfs_notify(), but I can't figure out what that setup is.

-- 
Timur Tabi
Linux kernel developer at Freescale
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