From 3833dd86aaf85a4c9f1294c6ffbf2759a8e01a38 Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon>
Date: Mon, 17 May 2010 12:29:31 +0000
Subject: [PATCH] Added LWIP_DEBUGF warning if dns_send returns an error

---
 src/core/dns.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/core/dns.c b/src/core/dns.c
index c55a84dd..2efc4517 100644
--- a/src/core/dns.c
+++ b/src/core/dns.c
@@ -635,6 +635,7 @@ dns_send(u8_t numdns, const char* name, u8_t id)
 static void
 dns_check_entry(u8_t i)
 {
+  err_t err;
   struct dns_table_entry *pEntry = &dns_table[i];
 
   LWIP_ASSERT("array index out of bounds", i < DNS_TABLE_SIZE);
@@ -649,7 +650,11 @@ dns_check_entry(u8_t i)
       pEntry->retries = 0;
       
       /* send DNS packet for this entry */
-      dns_send(pEntry->numdns, pEntry->name, i);
+      err = dns_send(pEntry->numdns, pEntry->name, i);
+      if (err != ERR_OK) {
+        LWIP_DEBUGF(DNS_DEBUG | LWIP_DBG_LEVEL_WARNING,
+                    ("dns_send returned error: %s\n", lwip_strerr(err)));
+      }
       break;
     }
 
@@ -678,7 +683,11 @@ dns_check_entry(u8_t i)
         pEntry->tmr = pEntry->retries;
 
         /* send DNS packet for this entry */
-        dns_send(pEntry->numdns, pEntry->name, i);
+        err = dns_send(pEntry->numdns, pEntry->name, i);
+        if (err != ERR_OK) {
+          LWIP_DEBUGF(DNS_DEBUG | LWIP_DBG_LEVEL_WARNING,
+                      ("dns_send returned error: %s\n", lwip_strerr(err)));
+        }
       }
       break;
     }