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diff --git a/sql/rpl_mi.h b/sql/rpl_mi.h
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+/* Copyright (C) 2000-2003 MySQL AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifndef RPL_MI_H
+#define RPL_MI_H
+
+#ifdef HAVE_REPLICATION
+
+/*****************************************************************************
+
+  Replication IO Thread
+
+  MASTER_INFO contains:
+    - information about how to connect to a master
+    - current master log name
+    - current master log offset
+    - misc control variables
+
+  MASTER_INFO is initialized once from the master.info file if such
+  exists. Otherwise, data members corresponding to master.info fields
+  are initialized with defaults specified by master-* options. The
+  initialization is done through init_master_info() call.
+
+  The format of master.info file:
+
+  log_name
+  log_pos
+  master_host
+  master_user
+  master_pass
+  master_port
+  master_connect_retry
+
+  To write out the contents of master.info file to disk ( needed every
+  time we read and queue data from the master ), a call to
+  flush_master_info() is required.
+
+  To clean up, call end_master_info()
+
+*****************************************************************************/
+
+class MASTER_INFO
+{
+ public:
+  MASTER_INFO();
+  ~MASTER_INFO();
+
+  /* the variables below are needed because we can change masters on the fly */
+  char master_log_name[FN_REFLEN];
+  char host[HOSTNAME_LENGTH+1];
+  char user[USERNAME_LENGTH+1];
+  char password[MAX_PASSWORD_LENGTH+1];
+  my_bool ssl; // enables use of SSL connection if true
+  char ssl_ca[FN_REFLEN], ssl_capath[FN_REFLEN], ssl_cert[FN_REFLEN];
+  char ssl_cipher[FN_REFLEN], ssl_key[FN_REFLEN];
+
+  my_off_t master_log_pos;
+  File fd; // we keep the file open, so we need to remember the file pointer
+  IO_CACHE file;
+
+  pthread_mutex_t data_lock,run_lock;
+  pthread_cond_t data_cond,start_cond,stop_cond;
+  THD *io_thd;
+  MYSQL* mysql;
+  uint32 file_id;				/* for 3.23 load data infile */
+  RELAY_LOG_INFO rli;
+  uint port;
+  uint connect_retry;
+#ifndef DBUG_OFF
+  int events_till_disconnect;
+#endif
+  bool inited;
+  volatile bool abort_slave;
+  volatile uint slave_running;
+  volatile ulong slave_run_id;
+  /*
+     The difference in seconds between the clock of the master and the clock of
+     the slave (second - first). It must be signed as it may be <0 or >0.
+     clock_diff_with_master is computed when the I/O thread starts; for this the
+     I/O thread does a SELECT UNIX_TIMESTAMP() on the master.
+     "how late the slave is compared to the master" is computed like this:
+     clock_of_slave - last_timestamp_executed_by_SQL_thread - clock_diff_with_master
+
+  */
+  long clock_diff_with_master;
+};
+
+void init_master_info_with_options(MASTER_INFO* mi);
+int init_master_info(MASTER_INFO* mi, const char* master_info_fname,
+		     const char* slave_info_fname,
+		     bool abort_if_no_master_info_file,
+		     int thread_mask);
+void end_master_info(MASTER_INFO* mi);
+int flush_master_info(MASTER_INFO* mi, bool flush_relay_log_cache);
+
+#endif /* HAVE_REPLICATION */
+#endif /* RPL_MI_H */