#include <db.h>
int
DB_ENV->rep_process_message(DB_ENV *env,
    DBT *control, DBT *rec, int envid, DB_LSN *ret_lsnp)  
      
         The DB_ENV->rep_process_message() method processes an incoming
         replication message sent by a member of the replication group to the
         local database environment.
    
         The DB_ENV->rep_process_message() method is not called by most
         replication applications.  It should only be called by Base API applications
         implementing their own network transport layer, explicitly holding
         replication group elections and handling replication messages outside
         of the Replication Manager framework.
    
For implementation reasons, all incoming replication messages must be processed using the same DB_ENV handle. It is not required that a single thread of control process all messages, only that all threads of control processing messages use the same handle.
Before calling this method, the enclosing database environment must already have been opened by calling the DB_ENV->open() method and must already have been configured to send replication messages by calling the DB_ENV->rep_set_transport() method.
         The DB_ENV->rep_process_message() method has additional return
         values:
    
                The DB_ENV->rep_process_message() method will return
                DB_REP_DUPMASTER if the replication group has more than one
                master. The application should reconfigure itself as a client by calling the 
                DB_ENV->rep_start()  method, and then call for an
                election by calling DB_ENV->rep_elect().
            
                 The DB_ENV->rep_process_message() method will return
                 DB_REP_HOLDELECTION if an election is needed. The application
                 should call for an election by calling 
                 DB_ENV->rep_elect().
            
                 The DB_ENV->rep_process_message() method will return
                 DB_REP_IGNORE if this message cannot be processed. This is an
                 indication that this message is irrelevant to the current replication state (for
                 example, an old message from a previous generation arrives and is processed late).
            
                 The DB_ENV->rep_process_message() method will return
                 DB_REP_ISPERM if processing this message results in the
                 processing of records that are permanent. The maximum LSN of the permanent records
                 stored is returned.
            
                 The DB_ENV->rep_process_message() method will return
                 DB_REP_JOIN_FAILURE if a new master has been chosen but the
                 client is unable to synchronize with the new master. This is possibly because the client
                 has turned off automatic internal initialization by setting the
                 DB_REP_CONF_AUTOINIT 
                 flag to 0.
            
                 The DB_ENV->rep_process_message() method will return
                 DB_REP_NEWSITE if the system received contact information from a
                 new environment. The rec parameter contains the
                 opaque data specified to the DB_ENV->rep_start()
                 cdata parameter.  The application should
                 take whatever action is needed to establish a communication channel with this new
                 environment.
            
                 The DB_ENV->rep_process_message() method will return
                 DB_REP_NOTPERM if a message carrying a 
                 DB_REP_PERMANENT 
                 flag was processed successfully, but was not written to disk. The LSN of this
                 record is returned.  The application should take whatever action is deemed
                 necessary to retain its recoverability characteristics.
            
         Unless otherwise specified, the DB_ENV->rep_process_message()
         
            
                  method returns a non-zero error value on failure and 0 on success.
            
            
        
    
The control parameter should reference a copy of the control parameter specified by Berkeley DB on the sending environment. See the DB_ENV->rep_set_transport() method for more information.
The rec parameter should reference a copy of the rec parameter specified by Berkeley DB on the sending environment. See the DB_ENV->rep_set_transport() method for more information.
The envid parameter should contain the local identifier that corresponds to the environment that sent the message to be processed (see Replication environment IDs for more information).
                         If DB_ENV->rep_process_message() method returns
                         DB_REP_NOTPERM then the 
                         ret_lsnp parameter will contain the log sequence
                         number of this permanent log message that could not be written to disk.  If
                         DB_ENV->rep_process_message() method returns
                         DB_REP_ISPERM then the 
                         ret_lsnp parameter will contain largest log
                         sequence number of the permanent records that are now written to disk as a
                         result of processing this message.  In all other cases the value of
                         ret_lsnp is undefined.
                     
            The DB_ENV->rep_process_message()
            
            
                 method may fail and return one of the following non-zero errors:
            
            
        
        
If the database environment was not already configured to communicate with a replication group by a call to DB_ENV->rep_set_transport(); if the database environment was not already opened; if this method is called from a Replication Manager application; or if an invalid flag value or parameter was specified.