linux-kernel - Re: [PATCH] request_firmware: skip timeout if userspace was not notified

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Message-ID: <20070807144850.289636a0@gondolin.boeblingen.de.ibm.com>
Date:	Tue, 7 Aug 2007 14:48:50 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Kay Sievers" <kay.sievers@...y.org>
Cc:	"Javier Pello" <javier.pello@...c.es>,
	linux-kernel@...r.kernel.org, "Greg KH" <greg@...ah.com>
Subject: Re: [PATCH] request_firmware: skip timeout if userspace was not
 notified

On Tue, 7 Aug 2007 14:31:34 +0200,
"Kay Sievers" <kay.sievers@...y.org> wrote:

> > > How do you check if events have been "handled"? None of the recent
> > > distros uses /sbin/hotplug anymore. Netlink events are broadcasted,
> > > but no failure in delivery doesn't mean anything like "handled", or
> > > delivered to the right instance. Even if you check that the netlink
> > > socket has listeners, that wouldn't be sufficient to tell that is is
> > > handled.
> >
> > You can't check if it's been handled, yes; but you can certainly check
> > if you delivered it.
> 
> The broadcast returns a failure when nobody received the message?

To my understanding, netlink_broadcast() returns 0 if the message was
delivered to someone, -ENOBUFS in case of failure and -ESRCH if nobody
listened.
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