From 797a29f353cbde0ba94d81afcc58ee96025bd753 Mon Sep 17 00:00:00 2001
From: Jilles Tjoelker <jilles@stack.nl>
Date: Tue, 20 Mar 2012 00:33:31 +0100
Subject: [PATCH] libratbox: Allow defer_accept on FreeBSD.

Note that you must have options ACCEPT_FILTER_DATA in your kernel
configuration or load the accf_data kernel module. The functionality is
not in the GENERIC kernel.
---
 libratbox/src/commio.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/libratbox/src/commio.c b/libratbox/src/commio.c
index ca822649..92e9d387 100644
--- a/libratbox/src/commio.c
+++ b/libratbox/src/commio.c
@@ -774,6 +774,17 @@ rb_listen(rb_fde_t *F, int backlog, int defer_accept)
 		setsockopt(F->fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &backlog, sizeof(int));
 	}
 #endif
+#ifdef SO_ACCEPTFILTER
+	if (defer_accept && !result)
+	{
+		struct accept_filter_arg afa;
+
+		memset(&afa, '\0', sizeof afa);
+		rb_strlcpy(afa.af_name, "dataready", sizeof afa.af_name);
+		(void)setsockopt(F->fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa,
+				sizeof afa);
+	}
+#endif
 
 	return result;
 }