Re: Best method for sending messages to user space?

From: Timur Tabi
Date: Tue Oct 21 2008 - 16:23:35 EST

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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