From ed1d8121c2d1b33f2c886c475109ef3f556b90c6 Mon Sep 17 00:00:00 2001
From: jmg <jmg@FreeBSD.org>
Date: Tue, 5 Aug 2003 07:12:49 +0000
Subject: add support for using kqueue to watch bpf sockets.

Submitted by:	Brian Buchanan of nCircle, Inc.
Tested on:	i386 and sparc64
---
 sys/net/bpfdesc.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'sys/net/bpfdesc.h')

diff --git a/sys/net/bpfdesc.h b/sys/net/bpfdesc.h
index fe059cd..73dcc90 100644
--- a/sys/net/bpfdesc.h
+++ b/sys/net/bpfdesc.h
@@ -104,6 +104,12 @@ struct bpf_d {
 #define BPFD_LOCK(bd)		mtx_lock(&(bd)->bd_mtx)
 #define BPFD_UNLOCK(bd)		mtx_unlock(&(bd)->bd_mtx)
 
+/* Test whether a BPF is ready for read(). */
+#define	bpf_ready(bd)						 \
+	((bd)->bd_hlen != 0 ||					 \
+	 (((bd)->bd_immediate || (bd)->bd_state == BPF_TIMED_OUT) && \
+	  (bd)->bd_slen != 0))
+
 /*
  * Descriptor associated with each attached hardware interface.
  */
-- 
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