From 820f6fa94ce812feab7fe3b0361b53ad8ca442d8 Mon Sep 17 00:00:00 2001
From: Hidetoshi Shimokawa <simokawa@FreeBSD.org>
Date: Thu, 31 May 2007 04:55:05 +0000
Subject: [PATCH] Discard backlog on GDB port when connected.

MFC after: 3 days
---
 usr.sbin/dconschat/dconschat.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/usr.sbin/dconschat/dconschat.c b/usr.sbin/dconschat/dconschat.c
index e7dc004088c..9594c16b888 100644
--- a/usr.sbin/dconschat/dconschat.c
+++ b/usr.sbin/dconschat/dconschat.c
@@ -605,6 +605,16 @@ dconschat_accept_socket(struct dcons_state *dc, struct dcons_port *p)
 		p->skip_read = 0;
 	}
 #endif
+	/* discard backlog on GDB port */
+	if (IS_GDB(p)) {
+		char buf[2048];
+		int len;
+
+		while ((len = dconschat_read_dcons(dc, DCONS_GDB, &buf[0],
+				 2048)) > 0)
+			if (verbose)
+				printf("discard %d chars on GDB port\n", len);
+	}
 
 	p->infd = p->outfd = ns;
 	EV_SET(&kev, ns, EVFILT_READ, EV_ADD, NOTE_LOWAT, 1, (void *)p);