MySQL replication--slave settings read the Binlog location

Change_master->global_init_info->master_info::mi_init_info->rpl_info_handler::init_info->rpl_info_ File::d o_init_info->mi->rli->rli_init_info (), initialize./relay-bin.000001,4 If relay -log.info does not exist, otherwise read

Initialize Master_info structure   int master_info::mi_init_info ()   {       if  (inited)           dbug_return (0);// If you have already created a Master_info file, Exit       handler->init_info () directly;//create/Open Master_info file        if  (check_return == repository_does_not_exist) {//if Master_ The info file is just created and the log location to be read is 4          init_master_log_pos ();           |--master_log_name[0]= 0;           |--master_log_pos= BIN_LOG_HEADER_SIZE;           |--ssl_verify_server_cert= 0;           |-- heartbeat_period= min<float> (Slave_max_heartbeat_period, (slave_net _timeout/2.0));        }else{          read_info (handler);//Read file        }      inited= 1;       flush_info (TRUE);       |--handler->set_sync_period (sync_ MASTERINFO_PERIOD);//default 10000      |--flush_io_cache (&info_file);       |--my_sync (INFO_FD,&NBSP;MYF (MY_WME));       dbug_return ( 0);

int rpl_info_file::d o_init_info ()   {       if  (ret_check == repository_does_not_exist) {           info_fd = my_open (info_fname, o_creat| o_rdwr| O_BINARY, MYF (MY_WME));           init_io_cache (& INFO_FILE, INFO_FD, IO_SIZE*2, READ_CACHE, 0L,0,MYF (MY_WME));       }else if  (ret_check == repository_exists) {           info_fd = my_open (info_fname, o_rdwr| O_BINARY, MYF (MY_WME));           init_io_cache (& INFO_FILE, INFO_FD, IO_SIZE*2, READ_CACHE, 0L,0, MYF (MY_WME))        }  } 

If Master.info does not exist, the corresponding Io_cache is created and initialized
If present, open and initialize the corresponding Io_cache

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MySQL replication--slave settings read the Binlog location