diff -Naur ganglia-monitor-core-2.5.7/gmond/gmond.conf ganglia-monitor-core-2.5.7-mod/gmond/gmond.conf
--- ganglia-monitor-core-2.5.7/gmond/gmond.conf	2004-01-20 17:15:23.000000000 -0200
+++ ganglia-monitor-core-2.5.7-mod/gmond/gmond.conf	2005-02-09 04:04:26.000000000 -0200
@@ -117,3 +117,7 @@
 # number of seconds.
 # default: 0 (immortal)
 # host_dmax 108000
+#
+# If you want to change the listening interval, then specify a value.(gappmon)
+# default: 0 (gmond uses a random number between 10 and 20)
+# heartbeat 0
diff -Naur ganglia-monitor-core-2.5.7/gmond/monitor.c ganglia-monitor-core-2.5.7-mod/gmond/monitor.c
--- ganglia-monitor-core-2.5.7/gmond/monitor.c	2003-04-16 18:46:44.000000000 -0300
+++ ganglia-monitor-core-2.5.7-mod/gmond/monitor.c	2005-02-09 04:04:37.000000000 -0200
@@ -2,6 +2,7 @@
 #include "ganglia.h"
 #include "metric_typedefs.h" 
 #include "key_metrics.h"
+#include <ganglia/gmond_config.h>
 
 extern metric_t metric[];
 
@@ -9,6 +10,7 @@
 
 extern g_mcast_socket * mcast_socket;
 extern pthread_mutex_t mcast_socket_mutex;
+extern gmond_config_t gmond_config;
 
 void set_check_threshold ( uint32_t key );
 void set_mcast_threshold ( uint32_t key );
@@ -113,7 +115,15 @@
                metric[i].mcast_threshold = 0;
             } 
       }
-
+    
+   /* Set the value for heartbeat, by Marcelo veiga Neves <veiga@inf.ufsm.br> (to support gappmon)*/
+   if(gmond_config.heartbeat != 0) {
+      metric[heartbeat].mcast_max = gmond_config.heartbeat + (gmond_config.heartbeat/4);
+      metric[heartbeat].mcast_min = gmond_config.heartbeat - (gmond_config.heartbeat/4);
+      if(gmond_config.heartbeat/4 == 0)
+         metric[heartbeat].mcast_min = -1;
+   }
+    
    for (;;)
       {
          for (i = 1 ; i < num_key_metrics; i++ )
diff -Naur ganglia-monitor-core-2.5.7/lib/ganglia/gmond_config.h ganglia-monitor-core-2.5.7-mod/lib/ganglia/gmond_config.h
--- ganglia-monitor-core-2.5.7/lib/ganglia/gmond_config.h	2004-01-20 17:15:40.000000000 -0200
+++ ganglia-monitor-core-2.5.7-mod/lib/ganglia/gmond_config.h	2005-02-09 04:04:26.000000000 -0200
@@ -33,6 +33,7 @@
       long int no_gexec;
       long int all_trusted;
       long int host_dmax;
+      int heartbeat;
 } gmond_config_t;
 
 int get_gmond_config( char *conffile);
diff -Naur ganglia-monitor-core-2.5.7/lib/gmond_config.c ganglia-monitor-core-2.5.7-mod/lib/gmond_config.c
--- ganglia-monitor-core-2.5.7/lib/gmond_config.c	2004-01-20 17:15:40.000000000 -0200
+++ ganglia-monitor-core-2.5.7-mod/lib/gmond_config.c	2005-02-09 04:04:26.000000000 -0200
@@ -208,6 +208,13 @@
    return NULL;
 }
 
+static DOTCONF_CB(cb_heartbeat)
+{
+   gmond_config_t *c = (gmond_config_t *)cmd->option->info;
+   c->heartbeat = cmd->data.value;
+   return NULL;
+}
+
 static int
 set_defaults(gmond_config_t *config )
 {
@@ -235,7 +242,7 @@
    config->no_gexec = 0;
    config->all_trusted = 0;
    config->host_dmax = 0;
-
+   config->heartbeat = 0;
    return 0;
 }
 
@@ -270,6 +277,7 @@
    printf("no_gexec is %ld\n", config->no_gexec);
    printf("all_trusted is %ld\n", config->all_trusted);
    printf("host_dmax is %ld\n", config->host_dmax);
+   printf("heartbeat is %d\n", config->heartbeat);
 }
 
 int 
@@ -304,6 +312,7 @@
          {"no_gexec", ARG_TOGGLE, cb_no_gexec, &gmond_config, 0},
          {"all_trusted", ARG_TOGGLE, cb_all_trusted, &gmond_config, 0},
          {"host_dmax", ARG_INT, cb_host_dmax, &gmond_config, 0},
+	 {"heartbeat", ARG_INT, cb_heartbeat, &gmond_config, 0},
          LAST_OPTION
       };