Date: Tue, 25 Jan 2000 01:07:14 +0000 From: Brian Somers <brian@Awfulhak.org> To: Peter Wemm <peter@netplex.com.au> Cc: Brian Somers <brian@FreeBSD.org>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org, brian@hak.lan.Awfulhak.org Subject: Re: cvs commit: src/sys/conf files src/sys/modules/if_tun Makefile src/sys/net intrq.c intrq.h if_tun.c src/sys/netatalk ddp_input.c src/sys/netatm atm_subr.c src/sys/netinet ip_input.c src/sys/netinet6 ip6_input.c src/sys/netipx ipx_input.c ... Message-ID: <200001250107.BAA36426@hak.lan.Awfulhak.org> In-Reply-To: Message from Peter Wemm <peter@netplex.com.au> of "Tue, 25 Jan 2000 05:59:23 %2B0800." <20000124215923.ACE971CD4@overcee.netplex.com.au>
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> Brian Somers wrote:
>
> > Added files:
> > sys/net intrq.c intrq.h
> > Log:
> > Move the *intrq variables into net/intrq.c and unconditionally
> > include this in all kernels. Declare some const *intrq_present
> > variables that can be checked by a module prior to using *intrq
> > to queue data.
>
> This is probably a silly question.. but suppose tun queues up mbufs in a
> queue for a protocol that isn't present.. What will happen to them? Lost
> forever sitting in the queue with nothing to empty it? How is ppp(8) or
> some other user process to know what is in the kernel?
That's what the *intrq_present variables are for. The file that's
#ifdef'd in with (for example) IPX will say
``const int ipxintrq_present = 1;'' whereas intrq.c says
``const int ipxintrq_present;''.
It's up to the module to make sure that if *intrq_present is zero,
nothing's dumped into the queue.
> Cheers,
> -Peter
> --
> Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
> "All of this is for nothing if we don't go to the stars" - JMS/B5
--
Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
<http://www.Awfulhak.org>; <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org.uk>
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