add a partial flag to darshan's header

this indicates whether the log file is complete or only partially
written

darshan-log-format.h

@@ -99,6 +99,7 @@ struct darshan_header
     char version_string[8];
     int64_t magic_nr;
     unsigned char comp_type;
+    unsigned char partial_flag;
     struct darshan_log_map rec_map;
     struct darshan_log_map mod_map[DARSHAN_MAX_MODS];
 };

darshan-runtime/lib/darshan-core.c

@@ -1567,8 +1567,13 @@ void darshan_core_register_record(
         /* record not found -- add it to the hash if we aren't already tracking the
          * maximum number of records
          */
+  
         if(darshan_core->rec_count >= DARSHAN_CORE_MAX_RECORDS)
         {
+            /* if we are already tracking the max records, set a flag to indicate
+             * that this log file has partial results
+             */
+            darshan_core->log_header.partial_flag = 1;
             DARSHAN_CORE_UNLOCK();
             return;
         }