This patch fixes the issue related to delayed response

of the snmpd agent when monitors are used.

This patch is taken from the community for the following bug. 

snmpd: PATCH: 1918383: Fix DisMan monitoring of AgentX subagents

http://sourceforge.net/p/net-snmp/patches/897/

--- net-snmp-5.4.1.old/agent/mibgroup/utilities/iquery.c	2006-10-12 15:21:28.000000000 -0700

+++ net-snmp-5.4.1/agent/mibgroup/utilities/iquery.c	2013-07-09 14:39:34.856060200 -0700

@@ -159,6 +159,8 @@

             memdup( &(ss->community), secName, strlen(secName));

             ss->community_len = strlen(secName);

         }

+        ss->myvoid = netsnmp_check_outstanding_agent_requests;

+        ss->flags |= SNMP_FLAGS_RESP_CALLBACK | SNMP_FLAGS_DONT_PROBE;

     }

 #endif

--- net-snmp-5.4.1.old/include/net-snmp/library/snmp_api.h	2007-03-23 02:44:49.000000000 -0700

+++ net-snmp-5.4.1/include/net-snmp/library/snmp_api.h	2013-05-08 02:17:51.242309300 -0700

@@ -300,7 +300,10 @@

     void           *securityInfo;

     /**

-     * use as you want data 

+     * use as you want data

+     *

+     *     used by 'SNMP_FLAGS_RESP_CALLBACK' handling in the agent

+     * XXX: or should we add a new field into this structure? 

      */

     void           *myvoid;

 };

@@ -394,6 +397,7 @@

 #define SNMP_DETAIL_SIZE        512

+#define SNMP_FLAGS_RESP_CALLBACK   0x400      /* Additional callback on response */

 #define SNMP_FLAGS_USER_CREATED    0x200      /* USM user has been created */

 #define SNMP_FLAGS_DONT_PROBE      0x100      /* don't probe for an engineID */

 #define SNMP_FLAGS_STREAM_SOCKET   0x80

--- net-snmp-5.4.1.old/snmplib/snmp_client.c	2007-07-03 15:36:42.000000000 -0700

+++ net-snmp-5.4.1/snmplib/snmp_client.c	2013-07-09 14:48:09.041945100 -0700

@@ -1014,7 +1014,7 @@

         count = select(numfds, &fdset, 0, 0, tvp);

         if (count > 0) {

             snmp_read(&fdset);

-        } else

+        } else {

             switch (count) {

             case 0:

                 snmp_timeout();

@@ -1040,6 +1040,14 @@

                 state->status = STAT_ERROR;

                 state->waiting = 0;

             }

+        }

+

+        if ( ss->flags & SNMP_FLAGS_RESP_CALLBACK ) {

+            void (*cb)(void);

+            cb = ss->myvoid;

+            cb();        /* Used to invoke 'netsnmp_check_outstanding_agent_requests();'

+                            on internal AgentX queries.  */

+        }

     }

     *response = state->pdu;

     ss->callback = cbsav;