[Patch 5/7] tabled: suppress repeating messages

Every time CLD crashes, I find my logs filled up with error messages.
But running without them is no good either, so I don't want to remove
this message entirely. Let us try some filtering.

Actually, I am still considering if we should not reset the error
to zero whenever a packet is recived successfuly, but this seems to
work well in practice.

Signed-Off-By: Pete Zaitcev <[email protected]>

---
 server/cldu.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

commit 1c2d867711e4fe62d2ba4dd2f334e0e44a8ff7fa
Author: Master <[email protected]>
Date:   Thu Jan 14 19:57:43 2010 -0700

    Filter error messages from UDP receives.

diff --git a/server/cldu.c b/server/cldu.c
index 1d61672..9cda87e 100644
--- a/server/cldu.c
+++ b/server/cldu.c
@@ -53,6 +53,7 @@ struct cld_session {
 	struct cldc_udp *lib;		/* library state */
 	struct event lib_timer;
 	int retry_cnt;
+	int last_recv_err;
 
 	/*
 	 * For code sanity and being isomorphic with conventional programming
@@ -226,7 +227,16 @@ static void cldu_event(int fd, short events, void *userdata)
 
 	rc = cldc_udp_receive_pkt(sp->lib);
 	if (rc) {
-		applog(LOG_INFO, "cldc_udp_receive_pkt failed: %d", rc);
+		if (rc != sp->last_recv_err) {
+			if (rc < -1000)		/* our internal code */
+				applog(LOG_INFO,
+				       "cldc_udp_receive_pkt failed: %d", rc);
+			else
+				applog(LOG_INFO,
+				       "cldc_udp_receive_pkt failed: %s",
+				       strerror(-rc));
+			sp->last_recv_err = rc;
+		}
 		/*
 		 * Reacting to ICMP messages is a bad idea, because
 		 *  - it makes us loop hard in case CLD is down, unless we