From: Chris Friesen <cfriesen@nortelnetworks.com>
To: Oliver Neukum <oliver@neukum.org>
Cc: Steve French <smfltc@us.ibm.com>, linux-kernel@vger.kernel.org
Subject: Re: upcalls from kernel code to user space daemons
Date: Mon, 14 Jun 2004 17:57:22 -0400 [thread overview]
Message-ID: <40CE1F42.1020407@nortelnetworks.com> (raw)
In-Reply-To: <200406142341.13340.oliver@neukum.org>
Oliver Neukum wrote:
> > userspace daemon loops on ioctl()
> > kernel portion of ioctl call goes to sleep until something to do
> > when needed, fill in data and return to userspace
> > userspace does stuff, then passes data back down via ioctl()
> > ioctl() puts userspace back to sleep and continues on with other work
>
> You could just as well implement an ordinary read()
Not quite. The userspace is passing data down as well. I don't know how you'd
do that with read().
Chris
next prev parent reply other threads:[~2004-06-14 21:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-14 18:07 upcalls from kernel code to user space daemons Steve French
2004-06-14 18:30 ` Chris Friesen
2004-06-14 21:40 ` Oliver Neukum
2004-06-14 21:57 ` Chris Friesen [this message]
2004-06-14 22:08 ` Bernd Petrovitsch
2004-06-14 22:22 ` Chris Friesen
2004-06-14 22:54 ` Tim Hockin
2004-06-14 23:10 ` Randy.Dunlap
2004-06-14 22:54 ` Steve French
2004-06-15 9:06 ` Oliver Neukum
2004-06-18 23:08 ` H. Peter Anvin
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