Date: Mon, 11 Dec 2000 01:48:37 -0800 From: Alfred Perlstein <bright@wintelcom.net> To: bmilekic@freebsd.org Cc: net@freebsd.org Subject: Abusing m_ext for a worthy goal. Message-ID: <20001211014837.W16205@fw.wintelcom.net>
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Ok, part of the mp cleanup got me looking at af_unix sockets.
Here's the deal, descriptors can be called "in-flight" meaning they
have been passed from one application to another via
CMG_DATA but not picked up on the other side yet.
The kernel does a bunch of hokey stuff to garbage collect them.
Instead of doing that I'd like to abuse MEXTADD to setup a callback
to remove the references automagicaly when the mbuf it free'd.
Here's the problem:
I want to use the mbuf clusters, I don't want to use any special
external storage. I want my callback to free the cluster.
Any hints on how to do this?
here's what I have so far:
MEXTADD(control, mtod(control, char *), control->m_len, unp_mbfree,
cm, M_RDONLY, EXT_CMSG_DATA);
control is a mbuf with a cluster attached the has fd's written in it.
cm is a pointer to the mbuf cluster.
static void
unp_mbfree(caddr_t mm, void *claddr)
{
struct mbuf *m = (struct mbuf *)mm;
unp_scan(m, unp_discard);
_MCLFREE(claddr);
}
does this look right? would you like to abstract the mbuf
clusters further before i started using the _ macros?
--
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
"I have the heart of a child; I keep it in a jar on my desk."
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