slave.cc 42 KB
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 */


#include "mysql_priv.h"
#include <mysql.h>
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#include <myisam.h>
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#include "mini_client.h"
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#include "slave.h"
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#include "sql_repl.h"
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#include <thr_alarm.h>
#include <my_dir.h>

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#define RPL_LOG_NAME (glob_mi.log_file_name[0] ? glob_mi.log_file_name :\
 "FIRST")

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bool slave_running = 0;
pthread_t slave_real_id;
MASTER_INFO glob_mi;
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HASH replicate_do_table, replicate_ignore_table;
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DYNAMIC_ARRAY replicate_wild_do_table, replicate_wild_ignore_table;
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bool do_table_inited = 0, ignore_table_inited = 0;
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bool wild_do_table_inited = 0, wild_ignore_table_inited = 0;
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bool table_rules_on = 0;
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uint32 slave_skip_counter = 0; 
static TABLE* save_temporary_tables = 0;
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THD* slave_thd = 0;
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// when slave thread exits, we need to remember the temporary tables so we
// can re-use them on slave start
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static int last_slave_errno = 0;
static char last_slave_error[1024] = "";
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#ifndef DBUG_OFF
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int disconnect_slave_event_count = 0, abort_slave_event_count = 0;
static int events_till_disconnect = -1, events_till_abort = -1;
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static int stuck_count = 0;
#endif
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inline void skip_load_data_infile(NET* net);
inline bool slave_killed(THD* thd);
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static int init_slave_thread(THD* thd);
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static int safe_connect(THD* thd, MYSQL* mysql, MASTER_INFO* mi);
static int safe_reconnect(THD* thd, MYSQL* mysql, MASTER_INFO* mi);
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static int safe_sleep(THD* thd, int sec);
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static int request_table_dump(MYSQL* mysql, const char* db, const char* table);
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static int create_table_from_dump(THD* thd, NET* net, const char* db,
				  const char* table_name);
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inline char* rewrite_db(char* db);
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static int check_expected_error(THD* thd, int expected_error);

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static void free_table_ent(TABLE_RULE_ENT* e)
{
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  my_free((gptr) e, MYF(0));
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}

static byte* get_table_key(TABLE_RULE_ENT* e, uint* len,
			   my_bool not_used __attribute__((unused)))
{
  *len = e->key_len;
  return (byte*)e->db;
}


void init_table_rule_hash(HASH* h, bool* h_inited)
{
  hash_init(h, TABLE_RULE_HASH_SIZE,0,0,
	    (hash_get_key) get_table_key,
	    (void (*)(void*)) free_table_ent, 0);
  *h_inited = 1;
}
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void init_table_rule_array(DYNAMIC_ARRAY* a, bool* a_inited)
{
  init_dynamic_array(a, sizeof(TABLE_RULE_ENT*), TABLE_RULE_ARR_SIZE,
		     TABLE_RULE_ARR_SIZE);
  *a_inited = 1;
}

static TABLE_RULE_ENT* find_wild(DYNAMIC_ARRAY *a, const char* key, int len)
{
  uint i;
  const char* key_end = key + len;
  
  for(i = 0; i < a->elements; i++)
    {
      TABLE_RULE_ENT* e ;
      get_dynamic(a, (gptr)&e, i);
      if(!wild_case_compare(key, key_end, (const char*)e->db,
			    (const char*)(e->db + e->key_len),'\\'))
	return e;
    }
  
  return 0;
}

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int tables_ok(THD* thd, TABLE_LIST* tables)
{
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  for (; tables; tables = tables->next)
  {
    if (!tables->updating) 
      continue;
    char hash_key[2*NAME_LEN+2];
    char* p;
    p = strmov(hash_key, tables->db ? tables->db : thd->db);
    *p++ = '.';
    uint len = strmov(p, tables->real_name) - hash_key ;
    if (do_table_inited) // if there are any do's
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    {
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      if (hash_search(&replicate_do_table, (byte*) hash_key, len))
	return 1;
    }
    if (ignore_table_inited) // if there are any do's
    {
      if (hash_search(&replicate_ignore_table, (byte*) hash_key, len))
	return 0; 
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    }
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    if (wild_do_table_inited && find_wild(&replicate_wild_do_table,
					  hash_key, len))
      return 1;
    if (wild_ignore_table_inited && find_wild(&replicate_wild_ignore_table,
					      hash_key, len))
      return 0;
  }
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  // if no explicit rule found
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  // and there was a do list, do not replicate. If there was
  // no do list, go ahead
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  return !do_table_inited && !wild_do_table_inited;
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}


int add_table_rule(HASH* h, const char* table_spec)
{
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  const char* dot = strchr(table_spec, '.');
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  if(!dot) return 1;
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  // len is always > 0 because we know the there exists a '.'
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  uint len = (uint)strlen(table_spec);
  TABLE_RULE_ENT* e = (TABLE_RULE_ENT*)my_malloc(sizeof(TABLE_RULE_ENT)
						 + len, MYF(MY_WME));
  if(!e) return 1;
  e->db = (char*)e + sizeof(TABLE_RULE_ENT);
  e->tbl_name = e->db + (dot - table_spec) + 1;
  e->key_len = len;
  memcpy(e->db, table_spec, len);
  (void)hash_insert(h, (byte*)e);
  return 0;
}

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int add_wild_table_rule(DYNAMIC_ARRAY* a, const char* table_spec)
{
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  const char* dot = strchr(table_spec, '.');
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  if(!dot) return 1;
  uint len = (uint)strlen(table_spec);
  TABLE_RULE_ENT* e = (TABLE_RULE_ENT*)my_malloc(sizeof(TABLE_RULE_ENT)
						 + len, MYF(MY_WME));
  if(!e) return 1;
  e->db = (char*)e + sizeof(TABLE_RULE_ENT);
  e->tbl_name = e->db + (dot - table_spec) + 1;
  e->key_len = len;
  memcpy(e->db, table_spec, len);
  insert_dynamic(a, (gptr)&e);
  return 0;
}

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static void free_string_array(DYNAMIC_ARRAY *a)
{
  uint i;
  for(i = 0; i < a->elements; i++)
    {
      char* p;
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      get_dynamic(a, (gptr) &p, i);
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      my_free(p, MYF(MY_WME));
    }
  delete_dynamic(a);
}

void end_slave()
{
  end_master_info(&glob_mi);
  if(do_table_inited)
    hash_free(&replicate_do_table);
  if(ignore_table_inited)
    hash_free(&replicate_ignore_table);
  if(wild_do_table_inited)
    free_string_array(&replicate_wild_do_table);
  if(wild_ignore_table_inited)
    free_string_array(&replicate_wild_ignore_table);
}
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inline bool slave_killed(THD* thd)
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{
  return abort_slave || abort_loop || thd->killed;
}

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inline void skip_load_data_infile(NET* net)
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{
  (void)my_net_write(net, "\xfb/dev/null", 10);
  (void)net_flush(net);
  (void)my_net_read(net); // discard response
  send_ok(net); // the master expects it
}

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inline char* rewrite_db(char* db)
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{
  if(replicate_rewrite_db.is_empty() || !db) return db;
  I_List_iterator<i_string_pair> it(replicate_rewrite_db);
  i_string_pair* tmp;

  while((tmp=it++))
    {
      if(!strcmp(tmp->key, db))
	return tmp->val;
    }

  return db;
}
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int db_ok(const char* db, I_List<i_string> &do_list,
	  I_List<i_string> &ignore_list )
{
  if(do_list.is_empty() && ignore_list.is_empty())
    return 1; // ok to replicate if the user puts no constraints

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  // if the user has specified restrictions on which databases to replicate
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  // and db was not selected, do not replicate
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  if(!db)
    return 0;
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  if(!do_list.is_empty()) // if the do's are not empty
    {
      I_List_iterator<i_string> it(do_list);
      i_string* tmp;

      while((tmp=it++))
	{
	  if(!strcmp(tmp->ptr, db))
	    return 1; // match
	}
      return 0;
    }
  else // there are some elements in the don't, otherwise we cannot get here
    {
      I_List_iterator<i_string> it(ignore_list);
      i_string* tmp;

      while((tmp=it++))
	{
	  if(!strcmp(tmp->ptr, db))
	    return 0; // match
	}
      
      return 1;
    }
}

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static int init_strvar_from_file(char* var, int max_size, IO_CACHE* f,
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			       char* default_val)
{
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  uint length;
  if ((length=my_b_gets(f,var, max_size)))
  {
    char* last_p = var + length -1;
    if (*last_p == '\n')
      *last_p = 0; // if we stopped on newline, kill it
    else
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    {
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      // if we truncated a line or stopped on last char, remove all chars
      // up to and including newline
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      int c;
      while( ((c=my_b_get(f)) != '\n' && c != my_b_EOF));
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    }
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    return 0;
  }
  else if (default_val)
  {
    strmake(var,  default_val, max_size);
    return 0;
  }
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  return 1;
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}

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static int init_intvar_from_file(int* var, IO_CACHE* f, int default_val)
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{
  char buf[32];
  
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  if (my_b_gets(f, buf, sizeof(buf))) 
  {
    *var = atoi(buf);
    return 0;
  }
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  else if(default_val)
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  {
    *var = default_val;
    return 0;
  }
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  return 1;
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}


static int create_table_from_dump(THD* thd, NET* net, const char* db,
				  const char* table_name)
{
  uint packet_len = my_net_read(net); // read create table statement
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  Vio* save_vio;
  HA_CHECK_OPT check_opt;
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  TABLE_LIST tables;
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  int error= 1;
  handler *file;
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  if (packet_len == packet_error)
  {
    send_error(&thd->net, ER_MASTER_NET_READ);
    return 1;
  }
  if (net->read_pos[0] == 255) // error from master
  {
    net->read_pos[packet_len] = 0;
    net_printf(&thd->net, ER_MASTER, net->read_pos + 3);
    return 1;
  }
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  thd->command = COM_TABLE_DUMP;
  thd->query = sql_alloc(packet_len + 1);
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  if (!thd->query)
  {
    sql_print_error("create_table_from_dump: out of memory");
    net_printf(&thd->net, ER_GET_ERRNO, "Out of memory");
    return 1;
  }
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  memcpy(thd->query, net->read_pos, packet_len);
  thd->query[packet_len] = 0;
  thd->current_tablenr = 0;
  thd->query_error = 0;
  thd->net.no_send_ok = 1;
  thd->proc_info = "Creating table from master dump";
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  // save old db in case we are creating in a different database
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  char* save_db = thd->db;
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  thd->db = (char*)db;
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  mysql_parse(thd, thd->query, packet_len); // run create table
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  thd->db = save_db;		// leave things the way the were before
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  if (thd->query_error)
    goto err;			// mysql_parse took care of the error send
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  bzero((char*) &tables,sizeof(tables));
  tables.db = (char*)db;
  tables.name = tables.real_name = (char*)table_name;
  tables.lock_type = TL_WRITE;
  thd->proc_info = "Opening master dump table";
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  if (!open_ltable(thd, &tables, TL_WRITE))
  {
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    send_error(&thd->net,0,0);			// Send error from open_ltable
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    sql_print_error("create_table_from_dump: could not open created table");
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    goto err;
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  }
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  file = tables.table->file;
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  thd->proc_info = "Reading master dump table data";
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  if (file->net_read_dump(net))
  {
    net_printf(&thd->net, ER_MASTER_NET_READ);
    sql_print_error("create_table_from_dump::failed in\
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 handler::net_read_dump()");
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    goto err;
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  }
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  check_opt.init();
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  check_opt.flags|= T_VERY_SILENT;
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  check_opt.quick = 1;
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  thd->proc_info = "Rebuilding the index on master dump table";
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  // we do not want repair() to spam us with messages
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  // just send them to the error log, and report the failure in case of
  // problems
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  save_vio = thd->net.vio;
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  thd->net.vio = 0;
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  error=file->repair(thd,&check_opt) != 0;
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  thd->net.vio = save_vio;
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  if (error)
    net_printf(&thd->net, ER_INDEX_REBUILD,tables.table->real_name);

err:
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  close_thread_tables(thd);
  thd->net.no_send_ok = 0;
  return error; 
}

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int fetch_nx_table(THD* thd, const char* db_name, const char* table_name,
		   MASTER_INFO* mi, MYSQL* mysql)
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{
  int error = 1;
  int nx_errno = 0;
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  bool called_connected = (mysql != NULL);
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  if (!called_connected && !(mysql = mc_mysql_init(NULL)))
  { 
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    sql_print_error("fetch_nx_table: Error in mysql_init()");
    nx_errno = ER_GET_ERRNO;
    goto err;
  }
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merge  
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  if (!called_connected)
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  {
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    if (connect_to_master(thd, mysql, mi))
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    {
      sql_print_error("Could not connect to master while fetching table\
 '%-64s.%-64s'", db_name, table_name);
      nx_errno = ER_CONNECT_TO_MASTER;
      goto err;
    }
  }
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  if (slave_killed(thd))
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    goto err;

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  if (request_table_dump(mysql, db_name, table_name))
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  {
    nx_errno = ER_GET_ERRNO;
    sql_print_error("fetch_nx_table: failed on table dump request ");
    goto err;
  }
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merge  
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  if (create_table_from_dump(thd, &mysql->net, db_name,
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			    table_name))
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  { 
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    // create_table_from_dump will have sent the error alread
    sql_print_error("fetch_nx_table: failed on create table ");
    goto err;
  }
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  error = 0;
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 err:
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  if (mysql && !called_connected)
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    mc_mysql_close(mysql);
  if (nx_errno && thd->net.vio)
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    send_error(&thd->net, nx_errno, "Error in fetch_nx_table");
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  thd->net.no_send_ok = 0; // Clear up garbage after create_table_from_dump
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  return error;
}

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void end_master_info(MASTER_INFO* mi)
{
  if(mi->fd >= 0)
    {
      end_io_cache(&mi->file);
      (void)my_close(mi->fd, MYF(MY_WME));
      mi->fd = -1;
    }
  mi->inited = 0;
}

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int init_master_info(MASTER_INFO* mi)
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{
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  if (mi->inited)
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    return 0;
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  int fd,length,error;
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  MY_STAT stat_area;
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  char fname[FN_REFLEN+128];
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  const char *msg;
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  fn_format(fname, master_info_file, mysql_data_home, "", 4+32);
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  // we need a mutex while we are changing master info parameters to
  // keep other threads from reading bogus info

  pthread_mutex_lock(&mi->lock);
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  mi->pending = 0;
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  fd = mi->fd;
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  // we do not want any messages if the file does not exist
  if (!my_stat(fname, &stat_area, MYF(0)))
  {
    // if someone removed the file from underneath our feet, just close
    // the old descriptor and re-create the old file
    if (fd >= 0)
      my_close(fd, MYF(MY_WME));
    if ((fd = my_open(fname, O_CREAT|O_RDWR|O_BINARY, MYF(MY_WME))) < 0
	|| init_io_cache(&mi->file, fd, IO_SIZE*2, READ_CACHE, 0L,0,
			 MYF(MY_WME)))
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    {
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      if(fd >= 0)
	my_close(fd, MYF(0));
      pthread_mutex_unlock(&mi->lock);
      return 1;
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    }
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    mi->log_file_name[0] = 0;
    mi->pos = 4; // skip magic number
    mi->fd = fd;
      
    if (master_host)
      strmake(mi->host, master_host, sizeof(mi->host) - 1);
    if (master_user)
      strmake(mi->user, master_user, sizeof(mi->user) - 1);
    if (master_password)
      strmake(mi->password, master_password, sizeof(mi->password) - 1);
    mi->port = master_port;
    mi->connect_retry = master_connect_retry;
  }
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  else // file exists
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  {
    if(fd >= 0)
      reinit_io_cache(&mi->file, READ_CACHE, 0L,0,0);
    else if((fd = my_open(fname, O_RDWR|O_BINARY, MYF(MY_WME))) < 0
	    || init_io_cache(&mi->file, fd, IO_SIZE*2, READ_CACHE, 0L,
			     0, MYF(MY_WME)))
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    {
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      if(fd >= 0)
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	my_close(fd, MYF(0));
      pthread_mutex_unlock(&mi->lock);
      return 1;
    }
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    if ((length=my_b_gets(&mi->file, mi->log_file_name,
			   sizeof(mi->log_file_name))) < 1)
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    {
      msg="Error reading log file name from master info file ";
      goto error;
    }
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    mi->log_file_name[length-1]= 0; // kill \n
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    char buf[FN_REFLEN];
    if(!my_b_gets(&mi->file, buf, sizeof(buf)))
    {
      msg="Error reading log file position from master info file";
      goto error;
    }
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    mi->pos = strtoull(buf,(char**) 0, 10);
    mi->fd = fd;
    if(init_strvar_from_file(mi->host, sizeof(mi->host), &mi->file,
			     master_host) ||
       init_strvar_from_file(mi->user, sizeof(mi->user), &mi->file,
			     master_user) || 
       init_strvar_from_file(mi->password, sizeof(mi->password), &mi->file,
			     master_password) ||
       init_intvar_from_file((int*)&mi->port, &mi->file, master_port) ||
       init_intvar_from_file((int*)&mi->connect_retry, &mi->file,
			     master_connect_retry))
    {
      msg="Error reading master configuration";
      goto error;
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    }
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  }
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  mi->inited = 1;
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  // now change the cache from READ to WRITE - must do this
  // before flush_master_info
  reinit_io_cache(&mi->file, WRITE_CACHE, 0L,0,1);
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  error=test(flush_master_info(mi));
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  pthread_mutex_unlock(&mi->lock);
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  return error;

error:
  sql_print_error(msg);
  end_io_cache(&mi->file);
  my_close(fd, MYF(0));
  pthread_mutex_unlock(&mi->lock);
  return 1;
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}

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int register_slave_on_master(MYSQL* mysql)
{
  String packet;
  uint len;
  char buf[4];

  if(!report_host)
    return 0;
  
  int4store(buf, server_id);
  packet.append(buf, 4);

  len = strlen(report_host);
  packet.append((char)(uchar)len);
  packet.append(report_host, len);

  len = strlen(report_user);
  packet.append((char)(uchar)len);
  packet.append(report_user, len);

  if(report_password)
  {
    len = strlen(report_password);
    packet.append((char)(uchar)len);
    packet.append(report_password, len);
  }
  else
  {
    packet.append((char)0);
  }

  int2store(buf, (uint16)report_port);
  packet.append(buf, 2);

  if(mc_simple_command(mysql, COM_REGISTER_SLAVE, (char*)packet.ptr(),
		       packet.length(), 0))
  {
    sql_print_error("Error on COM_REGISTER_SLAVE: '%s'",
		    mc_mysql_error(mysql));
    return 1;
  }

  return 0;
}


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int show_master_info(THD* thd)
{
  DBUG_ENTER("show_master_info");
  List<Item> field_list;
  field_list.push_back(new Item_empty_string("Master_Host",
						     sizeof(glob_mi.host)));
  field_list.push_back(new Item_empty_string("Master_User",
						     sizeof(glob_mi.user)));
  field_list.push_back(new Item_empty_string("Master_Port", 6));
  field_list.push_back(new Item_empty_string("Connect_retry", 6));
  field_list.push_back( new Item_empty_string("Log_File",
						     FN_REFLEN));
  field_list.push_back(new Item_empty_string("Pos", 12));
  field_list.push_back(new Item_empty_string("Slave_Running", 3));
  field_list.push_back(new Item_empty_string("Replicate_do_db", 20));
  field_list.push_back(new Item_empty_string("Replicate_ignore_db", 20));
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  field_list.push_back(new Item_empty_string("Last_errno", 4));
  field_list.push_back(new Item_empty_string("Last_error", 20));
  field_list.push_back(new Item_empty_string("Skip_counter", 12));
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  if(send_fields(thd, field_list, 1))
    DBUG_RETURN(-1);

  String* packet = &thd->packet;
  packet->length(0);
  
  pthread_mutex_lock(&glob_mi.lock);
  net_store_data(packet, glob_mi.host);
  net_store_data(packet, glob_mi.user);
  net_store_data(packet, (uint32) glob_mi.port);
  net_store_data(packet, (uint32) glob_mi.connect_retry);
  net_store_data(packet, glob_mi.log_file_name);
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  net_store_data(packet, (uint32) glob_mi.pos);	// QQ: Should be fixed
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  pthread_mutex_unlock(&glob_mi.lock);
  pthread_mutex_lock(&LOCK_slave);
  net_store_data(packet, slave_running ? "Yes":"No");
  pthread_mutex_unlock(&LOCK_slave);
  net_store_data(packet, &replicate_do_db);
  net_store_data(packet, &replicate_ignore_db);
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  net_store_data(packet, (uint32)last_slave_errno);
  net_store_data(packet, last_slave_error);
  net_store_data(packet, slave_skip_counter);
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  if (my_net_write(&thd->net, (char*)thd->packet.ptr(), packet->length()))
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    DBUG_RETURN(-1);

  send_eof(&thd->net);
  DBUG_RETURN(0);
}

int flush_master_info(MASTER_INFO* mi)
{
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  IO_CACHE* file = &mi->file;
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  char lbuf[22];
  
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  my_b_seek(file, 0L);
  my_b_printf(file, "%s\n%s\n%s\n%s\n%s\n%d\n%d\n",
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	      mi->log_file_name, llstr(mi->pos, lbuf), mi->host, mi->user,
	      mi->password, mi->port, mi->connect_retry);
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  flush_io_cache(file);
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  return 0;
}

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int st_master_info::wait_for_pos(THD* thd, String* log_name, ulonglong log_pos)
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{
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  if (!inited) return -1;
  bool pos_reached;
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  int event_count = 0;
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  pthread_mutex_lock(&lock);
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  while(!thd->killed)
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  {
    int cmp_result;
    if (*log_file_name)
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    {
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      /*
	We should use dirname_length() here when we have a version of
	this that doesn't modify the argument */
      char *basename = strrchr(log_file_name, FN_LIBCHAR);
      if (basename)
	++basename;
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      else
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	basename = log_file_name;
      cmp_result =  strncmp(basename, log_name->ptr(),
			    log_name->length());
    }
    else
      cmp_result = 0;
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    pos_reached = ((!cmp_result && pos >= log_pos) || cmp_result > 0);
    if (pos_reached || thd->killed)
      break;
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    const char* msg = thd->enter_cond(&cond, &lock,
				      "Waiting for master update");
    pthread_cond_wait(&cond, &lock);
    thd->exit_cond(msg);
    event_count++;
  }
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  pthread_mutex_unlock(&lock);
  return thd->killed ? -1 : event_count;
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}

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static int init_slave_thread(THD* thd)
{
  DBUG_ENTER("init_slave_thread");
  thd->system_thread = thd->bootstrap = 1;
  thd->client_capabilities = 0;
  my_net_init(&thd->net, 0);
  thd->max_packet_length=thd->net.max_packet;
  thd->master_access= ~0;
  thd->priv_user = 0;
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  thd->slave_thread = 1;
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  thd->options = (((opt_log_slave_updates) ? OPTION_BIN_LOG:0) | OPTION_AUTO_IS_NULL) ;
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  thd->system_thread = 1;
  thd->client_capabilities = CLIENT_LOCAL_FILES;
  slave_real_id=thd->real_id=pthread_self();
  pthread_mutex_lock(&LOCK_thread_count);
  thd->thread_id = thread_id++;
  pthread_mutex_unlock(&LOCK_thread_count);

  if (init_thr_lock() ||
      my_pthread_setspecific_ptr(THR_THD,  thd) ||
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      my_pthread_setspecific_ptr(THR_MALLOC, &thd->mem_root) ||
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      my_pthread_setspecific_ptr(THR_NET,  &thd->net))
  {
    close_connection(&thd->net,ER_OUT_OF_RESOURCES); // is this needed?
    end_thread(thd,0);
    DBUG_RETURN(-1);
  }

  thd->mysys_var=my_thread_var;
  thd->dbug_thread_id=my_thread_id();
#ifndef __WIN__
  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif

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  thd->mem_root.free=thd->mem_root.used=0;	// Probably not needed
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  if (thd->max_join_size == (ulong) ~0L)
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info="Waiting for master update";
  thd->version=refresh_version;
  thd->set_time();

  DBUG_RETURN(0);
}

static int safe_sleep(THD* thd, int sec)
{
  thr_alarm_t alarmed;
  thr_alarm_init(&alarmed);
  time_t start_time= time((time_t*) 0);
  time_t end_time= start_time+sec;
  ALARM  alarm_buff;

  while (start_time < end_time)
  {
    int nap_time = (int) (end_time - start_time);
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    /*
      the only reason we are asking for alarm is so that
      we will be woken up in case of murder, so if we do not get killed,
      set the alarm so it goes off after we wake up naturally
    */
    thr_alarm(&alarmed, 2 * nap_time,&alarm_buff);
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    sleep(nap_time);
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    // if we wake up before the alarm goes off, hit the button
    // so it will not wake up the wife and kids :-)
    if (thr_alarm_in_use(&alarmed))
      thr_end_alarm(&alarmed);
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    if (slave_killed(thd))
      return 1;
    start_time=time((time_t*) 0);
  }
  return 0;
}


static int request_dump(MYSQL* mysql, MASTER_INFO* mi)
{
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  char buf[FN_REFLEN + 10];
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  int len;
  int binlog_flags = 0; // for now
  char* logname = mi->log_file_name;
  int4store(buf, mi->pos);
  int2store(buf + 4, binlog_flags);
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  int4store(buf + 6, server_id);
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  len = (uint) strlen(logname);
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  memcpy(buf + 10, logname,len);
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  if (mc_simple_command(mysql, COM_BINLOG_DUMP, buf, len + 10, 1))
  {
    // something went wrong, so we will just reconnect and retry later
    // in the future, we should do a better error analysis, but for
    // now we just fill up the error log :-)
    sql_print_error("Error on COM_BINLOG_DUMP: %s, will retry in %d secs",
		    mc_mysql_error(mysql), master_connect_retry);
    return 1;
  }
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  return 0;
}

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static int request_table_dump(MYSQL* mysql, const char* db, const char* table)
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{
  char buf[1024];
  char * p = buf;
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  uint table_len = (uint) strlen(table);
  uint db_len = (uint) strlen(db);
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  if(table_len + db_len > sizeof(buf) - 2)
    {
      sql_print_error("request_table_dump: Buffer overrun");
      return 1;
    } 
  
  *p++ = db_len;
  memcpy(p, db, db_len);
  p += db_len;
  *p++ = table_len;
  memcpy(p, table, table_len);
  
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  if (mc_simple_command(mysql, COM_TABLE_DUMP, buf, p - buf + table_len, 1))
  {
    sql_print_error("request_table_dump: Error sending the table dump \
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command");
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    return 1;
  }
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  return 0;
}


static uint read_event(MYSQL* mysql, MASTER_INFO *mi)
{
  uint len = packet_error;
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  // for convinience lets think we start by
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  // being in the interrupted state :-)
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  int read_errno = EINTR;

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  // my_real_read() will time us out
  // we check if we were told to die, and if not, try reading again
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#ifndef DBUG_OFF
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  if (disconnect_slave_event_count && !(events_till_disconnect--))
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    return packet_error;      
#endif
  
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  while (!abort_loop && !abort_slave && len == packet_error &&
	 read_errno == EINTR )
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  {
    len = mc_net_safe_read(mysql);
    read_errno = errno;
  }
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  if (abort_loop || abort_slave)
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    return packet_error;
  if (len == packet_error || (int) len < 1)
  {
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    sql_print_error("Error reading packet from server: %s (read_errno %d,\
server_errno=%d)",
		    mc_mysql_error(mysql), read_errno, mc_mysql_errno(mysql));
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    return packet_error;
  }

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  if (len == 1)
  {
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     sql_print_error("Slave: received 0 length packet from server, apparent\
 master shutdown: %s (%d)",
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		     mc_mysql_error(mysql), read_errno);
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     return packet_error;
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  }
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  DBUG_PRINT("info",( "len=%u, net->read_pos[4] = %d\n",
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		      len, mysql->net.read_pos[4]));
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  return len - 1;   
}

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static int check_expected_error(THD* thd, int expected_error)
{
  switch(expected_error)
    {
    case ER_NET_READ_ERROR:
    case ER_NET_ERROR_ON_WRITE:  
    case ER_SERVER_SHUTDOWN:  
    case ER_NEW_ABORTING_CONNECTION:
      my_snprintf(last_slave_error, sizeof(last_slave_error), 
		 "Slave: query '%s' partially completed on the master \
and was aborted. There is a chance that your master is inconsistent at this \
point. If you are sure that your master is ok, run this query manually on the\
 slave and then restart the slave with SET SQL_SLAVE_SKIP_COUNTER=1;\
 SLAVE START;", thd->query);
      last_slave_errno = expected_error;
      sql_print_error(last_slave_error);
      return 1;
    default:
      return 0;
    }
}
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static int exec_event(THD* thd, NET* net, MASTER_INFO* mi, int event_len)
{
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  Log_event * ev = Log_event::read_log_event((const char*)net->read_pos + 1,
					     event_len);
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  char llbuff[22];
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  if (ev)
  {
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    int type_code = ev->get_type_code();
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    if (ev->server_id == ::server_id || slave_skip_counter)
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    {
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      if(type_code == LOAD_EVENT)
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	skip_load_data_infile(net);
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      mi->inc_pos(event_len);
      flush_master_info(mi);
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      if(slave_skip_counter)
        --slave_skip_counter;
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      delete ev;     
      return 0;					// avoid infinite update loops
    }
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    thd->server_id = ev->server_id; // use the original server id for logging
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    thd->set_time();				// time the query
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    if(!ev->when)
      ev->when = time(NULL);
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    switch(type_code) {
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    case QUERY_EVENT:
    {
      Query_log_event* qev = (Query_log_event*)ev;
      int q_len = qev->q_len;
947
      int expected_error,actual_error = 0;
948
      init_sql_alloc(&thd->mem_root, 8192,0);
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      thd->db = rewrite_db((char*)qev->db);
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      if (db_ok(thd->db, replicate_do_db, replicate_ignore_db))
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      {
	thd->query = (char*)qev->query;
	thd->set_time((time_t)qev->when);
	thd->current_tablenr = 0;
	VOID(pthread_mutex_lock(&LOCK_thread_count));
	thd->query_id = query_id++;
	VOID(pthread_mutex_unlock(&LOCK_thread_count));
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	thd->query_error = 0;			// clear error
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	thd->net.last_errno = 0;
	thd->net.last_error[0] = 0;
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	thd->slave_proxy_id = qev->thread_id;	// for temp tables
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	// sanity check to make sure the master did not get a really bad
	// error on the query
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	if (!check_expected_error(thd, (expected_error = qev->error_code)))
	{
	  mysql_parse(thd, thd->query, q_len);
	  if (expected_error !=
	      (actual_error = thd->net.last_errno) && expected_error)
970
	  {
971
	    const char* errmsg = "Slave: did not get the expected error\
972
 running query from master - expected: '%s'(%d), got '%s'(%d)"; 
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	    sql_print_error(errmsg, ER_SAFE(expected_error),
			    expected_error,
			    actual_error ? thd->net.last_error:"no error",
			    actual_error);
	    thd->query_error = 1;
978
	  }
979
	  else if (expected_error == actual_error)
980
	  {
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	    thd->query_error = 0;
	    *last_slave_error = 0;
	    last_slave_errno = 0;
984
	  }
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	}
	else
	{
	  // master could be inconsistent, abort and tell DBA to check/fix it
	  thd->db = thd->query = 0;
	  thd->convert_set = 0;
	  close_thread_tables(thd);
	  free_root(&thd->mem_root,0);
	  delete ev;
	  return 1;
	}
996
      }
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      thd->db = 0;				// prevent db from being freed
      thd->query = 0;				// just to be sure
      // assume no convert for next query unless set explictly
      thd->convert_set = 0;
1001
      close_thread_tables(thd);
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1002
      
1003
      if (thd->query_error || thd->fatal_error)
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      {
	sql_print_error("Slave:  error running query '%s' ",
			qev->query);
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	last_slave_errno = actual_error ? actual_error : -1;
	my_snprintf(last_slave_error, sizeof(last_slave_error),
		    "error '%s' on query '%s'",
		    actual_error ? thd->net.last_error :
		    "unexpected success or fatal error",
		    qev->query
		    );
1014
        free_root(&thd->mem_root,0);
1015
	delete ev;
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	return 1;
      }
1018
      free_root(&thd->mem_root,0);
1019
      delete ev;
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      mi->inc_pos(event_len);
      flush_master_info(mi);
      break;
    }
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    case LOAD_EVENT:
    {
      Load_log_event* lev = (Load_log_event*)ev;
      init_sql_alloc(&thd->mem_root, 8192,0);
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      thd->db = rewrite_db((char*)lev->db);
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      thd->query = 0;
      thd->query_error = 0;
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      if(db_ok(thd->db, replicate_do_db, replicate_ignore_db))
      {
	thd->set_time((time_t)lev->when);
	thd->current_tablenr = 0;
	VOID(pthread_mutex_lock(&LOCK_thread_count));
	thd->query_id = query_id++;
	VOID(pthread_mutex_unlock(&LOCK_thread_count));

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	TABLE_LIST tables;
	bzero((char*) &tables,sizeof(tables));
	tables.db = thd->db;
	tables.name = tables.real_name = (char*)lev->table_name;
	tables.lock_type = TL_WRITE;
	// the table will be opened in mysql_load    
        if(table_rules_on && !tables_ok(thd, &tables))
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1049
	{
1050
	  skip_load_data_infile(net);
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1051
	}
1052
	else
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	{
	  enum enum_duplicates handle_dup = DUP_IGNORE;
	  if(lev->sql_ex.opt_flags && REPLACE_FLAG)
	    handle_dup = DUP_REPLACE;
	  sql_exchange ex((char*)lev->fname, lev->sql_ex.opt_flags &&
			  DUMPFILE_FLAG );
	  String field_term(&lev->sql_ex.field_term, 1),
	    enclosed(&lev->sql_ex.enclosed, 1),
	    line_term(&lev->sql_ex.line_term,1),
	    escaped(&lev->sql_ex.escaped, 1),
	    line_start(&lev->sql_ex.line_start, 1);
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	  ex.field_term = &field_term;
	  if(lev->sql_ex.empty_flags & FIELD_TERM_EMPTY)
	    ex.field_term->length(0);
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	  ex.enclosed = &enclosed;
	  if(lev->sql_ex.empty_flags & ENCLOSED_EMPTY)
	    ex.enclosed->length(0);
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	  ex.line_term = &line_term;
	  if(lev->sql_ex.empty_flags & LINE_TERM_EMPTY)
	    ex.line_term->length(0);
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1077 1078 1079
	  ex.line_start = &line_start;
	  if(lev->sql_ex.empty_flags & LINE_START_EMPTY)
	    ex.line_start->length(0);
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	  ex.escaped = &escaped;
	  if(lev->sql_ex.empty_flags & ESCAPED_EMPTY)
	    ex.escaped->length(0);
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	  ex.opt_enclosed = (lev->sql_ex.opt_flags & OPT_ENCLOSED_FLAG);
	  if(lev->sql_ex.empty_flags & FIELD_TERM_EMPTY)
	    ex.field_term->length(0);
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1089
	  ex.skip_lines = lev->skip_lines;
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1092 1093 1094 1095 1096 1097
	  List<Item> fields;
	  lev->set_fields(fields);
	  thd->slave_proxy_id = thd->thread_id;
	  thd->net.vio = net->vio;
	  // mysql_load will use thd->net to read the file
	  thd->net.pkt_nr = net->pkt_nr;
1098
	  // make sure the client does not get confused
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1099 1100 1101 1102 1103
	  // about the packet sequence
	  if(mysql_load(thd, &ex, &tables, fields, handle_dup, 1,
			TL_WRITE))
	    thd->query_error = 1;
	  if(thd->cuted_fields)
1104 1105 1106
	    sql_print_error("Slave: load data infile at position %s in log \
'%s' produced %d warning(s)", llstr(glob_mi.pos,llbuff), RPL_LOG_NAME,
			    thd->cuted_fields );
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	  net->pkt_nr = thd->net.pkt_nr;
	}
1109
      }
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1110
      else
1111
      {
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1112 1113
	// we will just ask the master to send us /dev/null if we do not
	// want to load the data :-)
1114
	skip_load_data_infile(net);
1115
      }
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1116
	    
1117 1118 1119 1120 1121 1122 1123 1124
      thd->net.vio = 0; 
      thd->db = 0;// prevent db from being freed
      close_thread_tables(thd);
      if(thd->query_error)
      {
	int sql_error = thd->net.last_errno;
	if(!sql_error)
	  sql_error = ER_UNKNOWN_ERROR;
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	sql_print_error("Slave: Error '%s' running load data infile ",
1127 1128
			ER(sql_error));
	delete ev;
1129
        free_root(&thd->mem_root,0);
1130 1131
	return 1;
      }
1132
      
1133
      delete ev;
1134
      free_root(&thd->mem_root,0);
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1136 1137 1138 1139 1140 1141
      if(thd->fatal_error)
      {
	sql_print_error("Slave: Fatal error running query '%s' ",
			thd->query);
	return 1;
      }
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1142

1143 1144 1145 1146 1147 1148
      mi->inc_pos(event_len);
      flush_master_info(mi);
      break;
    }

    case START_EVENT:
1149
      close_temporary_tables(thd);
1150 1151
      mi->inc_pos(event_len);
      flush_master_info(mi);
1152
      delete ev;
1153
      break;
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1154
                  
1155
    case STOP_EVENT:
1156 1157 1158 1159 1160 1161
      if(mi->pos > 4) // stop event should be ignored after rotate event
	{
          close_temporary_tables(thd);
          mi->inc_pos(event_len);
          flush_master_info(mi);
	}
1162
      delete ev;
1163 1164 1165 1166 1167
      break;
    case ROTATE_EVENT:
    {
      Rotate_log_event* rev = (Rotate_log_event*)ev;
      int ident_len = rev->ident_len;
1168
      pthread_mutex_lock(&mi->lock);
1169 1170
      memcpy(mi->log_file_name, rev->new_log_ident,ident_len );
      mi->log_file_name[ident_len] = 0;
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      mi->pos = 4; // skip magic number
1172 1173
      pthread_cond_broadcast(&mi->cond);
      pthread_mutex_unlock(&mi->lock);
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      flush_master_info(mi);
1175 1176 1177 1178
#ifndef DBUG_OFF
      if(abort_slave_event_count)
	++events_till_abort;
#endif      
1179
      delete ev;
1180 1181
      break;
    }
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1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194
    case INTVAR_EVENT:
    {
      Intvar_log_event* iev = (Intvar_log_event*)ev;
      switch(iev->type)
      {
      case LAST_INSERT_ID_EVENT:
	thd->last_insert_id_used = 1;
	thd->last_insert_id = iev->val;
	break;
      case INSERT_ID_EVENT:
	thd->next_insert_id = iev->val;
	break;
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1196
      }
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      mi->inc_pending(event_len);
1198
      delete ev;
1199 1200
      break;
    }
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1201
    }
1202
  }
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1203
  else
1204
  {
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1205 1206 1207 1208
    sql_print_error("\
Could not parse log event entry, check the master for binlog corruption\n\
This may also be a network problem, or just a bug in the master or slave code.\
");
1209 1210 1211
    return 1;
  }
  return 0;	  
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1212 1213 1214 1215 1216 1217
}
      
// slave thread

pthread_handler_decl(handle_slave,arg __attribute__((unused)))
{
1218 1219 1220
#ifndef DBUG_OFF
 slave_begin:  
#endif  
1221
  THD *thd; // needs to be first for thread_stack
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1222
  MYSQL *mysql = NULL ;
1223
  char llbuff[22];
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1224

1225
  pthread_mutex_lock(&LOCK_slave);
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  if (!server_id)
  {
    pthread_cond_broadcast(&COND_slave_start);
    pthread_mutex_unlock(&LOCK_slave);
    sql_print_error("Server id not set, will not start slave");
    pthread_exit((void*)1);
  }
1233
  
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1234 1235
  if(slave_running)
    {
1236
      pthread_cond_broadcast(&COND_slave_start);
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      pthread_mutex_unlock(&LOCK_slave);
1238
      pthread_exit((void*)1);  // safety just in case
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1239 1240 1241
    }
  slave_running = 1;
  abort_slave = 0;
1242 1243 1244
#ifndef DBUG_OFF  
  events_till_abort = abort_slave_event_count;
#endif  
1245 1246
  pthread_cond_broadcast(&COND_slave_start);
  pthread_mutex_unlock(&LOCK_slave);
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1247
  
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1248
  // int error = 1;
1249
  bool retried_once = 0;
1250
  ulonglong last_failed_pos = 0;
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1251
  
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1252 1253
  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
1254
  slave_thd = thd = new THD; // note that contructor of THD uses DBUG_ !
1255
  thd->set_time();
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1256 1257 1258
  DBUG_ENTER("handle_slave");

  pthread_detach_this_thread();
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1259
  if (init_slave_thread(thd) || init_master_info(&glob_mi))
1260 1261 1262 1263
    {
      sql_print_error("Failed during slave thread initialization");
      goto err;
    }
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1264
  thd->thread_stack = (char*)&thd; // remember where our stack is
1265
  thd->temporary_tables = save_temporary_tables; // restore temp tables
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1266 1267
  threads.append(thd);
  
1268 1269
  DBUG_PRINT("info",("master info: log_file_name=%s, position=%s",
		     glob_mi.log_file_name, llstr(glob_mi.pos,llbuff)));
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1271 1272 1273 1274 1275 1276
  
  if (!(mysql = mc_mysql_init(NULL)))
  {
    sql_print_error("Slave thread: error in mc_mysql_init()");
    goto err;
  }
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1277 1278
  
  thd->proc_info = "connecting to master";
1279 1280
#ifndef DBUG_OFF  
  sql_print_error("Slave thread initialized");
1281 1282
#endif
  // we can get killed during safe_connect
1283
  if (!safe_connect(thd, mysql, &glob_mi))
1284
   sql_print_error("Slave: connected to master '%s@%s:%d',\
1285 1286 1287 1288
  replication started in log '%s' at position %s", glob_mi.user,
		   glob_mi.host, glob_mi.port,
		   RPL_LOG_NAME,
		   llstr(glob_mi.pos,llbuff));
1289
  else
1290 1291 1292 1293
  {
    sql_print_error("Slave thread killed while connecting to master");
    goto err;
  }
1294 1295 1296 1297 1298 1299

  // register ourselves with the master
  // if fails, this is not fatal - we just print the error message and go
  // on with life
  thd->proc_info = "Registering slave on master";
  register_slave_on_master(mysql);
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  while (!slave_killed(thd))
  {
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1303
      thd->proc_info = "Requesting binlog dump";
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1304 1305 1306 1307
      if(request_dump(mysql, &glob_mi))
	{
	  sql_print_error("Failed on request_dump()");
	  if(slave_killed(thd))
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1308
	    {
1309 1310 1311 1312
	      sql_print_error("Slave thread killed while requesting master \
dump");
              goto err;
	    }
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1314
	  thd->proc_info = "Waiiting to reconnect after a failed dump request";
1315
	  if(mysql->net.vio)
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	    vio_close(mysql->net.vio);
	  // first time retry immediately, assuming that we can recover
	  // right away - if first time fails, sleep between re-tries
	  // hopefuly the admin can fix the problem sometime
	  if(retried_once)
	    safe_sleep(thd, glob_mi.connect_retry);
	  else
	    retried_once = 1;
	  
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1325
	  if(slave_killed(thd))
1326 1327 1328
	    {
	      sql_print_error("Slave thread killed while retrying master \
dump");
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1329
	      goto err;
1330
	    }
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	  thd->proc_info = "Reconnecting after a failed dump request";
1333
	  last_failed_pos=glob_mi.pos;
1334
          sql_print_error("Slave: failed dump request, reconnecting to \
1335 1336
try again, log '%s' at postion %s", RPL_LOG_NAME,
			  llstr(last_failed_pos,llbuff));
1337
	  if(safe_reconnect(thd, mysql, &glob_mi) || slave_killed(thd))
1338 1339
	    {
	      sql_print_error("Slave thread killed during or after reconnect");
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1340
	      goto err;
1341
	    }
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	  continue;
	}


      while(!slave_killed(thd))
	{
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	  thd->proc_info = "Reading master update";
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1350 1351
	  uint event_len = read_event(mysql, &glob_mi);
	  if(slave_killed(thd))
1352 1353 1354 1355
	    {
	      sql_print_error("Slave thread killed while reading event");
	      goto err;
	    }
1356 1357

	  	  
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1358 1359
	  if (event_len == packet_error)
	  {
1360 1361 1362 1363 1364 1365 1366 1367 1368
	    if(mc_mysql_errno(mysql) == ER_NET_PACKET_TOO_LARGE)
	      {
		sql_print_error("Log entry on master is longer than \
max_allowed_packet on slave. Slave thread will be aborted. If the entry is \
really supposed to be that long, restart the server with a higher value of \
max_allowed_packet. The current value is %ld", max_allowed_packet);
		goto err;
	      }
	    
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	    thd->proc_info = "Waiting to reconnect after a failed read";
1370
	    if(mysql->net.vio)
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 	      vio_close(mysql->net.vio);
	    if(retried_once) // punish repeat offender with sleep
	      safe_sleep(thd, glob_mi.connect_retry);
	    else
	      retried_once = 1; 
	    
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	    if(slave_killed(thd))
1378 1379 1380 1381 1382
	      {
		sql_print_error("Slave thread killed while waiting to \
reconnect after a failed read");
	        goto err;
	      }
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	    thd->proc_info = "Reconnecting after a failed read";
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	    last_failed_pos= glob_mi.pos;
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	    sql_print_error("Slave: Failed reading log event, \
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reconnecting to retry, log '%s' position %s", RPL_LOG_NAME,
			    llstr(last_failed_pos, llbuff));
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	    if(safe_reconnect(thd, mysql, &glob_mi) || slave_killed(thd))
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	      {
		sql_print_error("Slave thread killed during or after a \
reconnect done to recover from failed read");
	        goto err;
	      }
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	    break;
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	  }
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	  thd->proc_info = "Processing master log event"; 
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	  if(exec_event(thd, &mysql->net, &glob_mi, event_len))
	    {
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	      sql_print_error("\
Error running query, slave aborted. Fix the problem, and re-start \
the slave thread with \"mysqladmin start-slave\". We stopped at log \
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'%s' position %s",
			      RPL_LOG_NAME, llstr(glob_mi.pos, llbuff));
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	      goto err;
	      // there was an error running the query
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	      // abort the slave thread, when the problem is fixed, the user
	      // should restart the slave with mysqladmin start-slave
	    }
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#ifndef DBUG_OFF
	  if(abort_slave_event_count && !--events_till_abort)
	    {
	      sql_print_error("Slave: debugging abort");
	      goto err;
	    }
#endif	  
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	  // successful exec with offset advance,
	  // the slave repents and his sins are forgiven!
	  if(glob_mi.pos > last_failed_pos)
	    {
	     retried_once = 0;
#ifndef DBUG_OFF
	     stuck_count = 0;
#endif
	    }
#ifndef DBUG_OFF
	  else
	    {
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	      // show a little mercy, allow slave to read one more event
	      // before cutting him off - otherwise he gets stuck
	      // on Invar events, since they do not advance the offset
	      // immediately
	      if (++stuck_count > 2)
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	        events_till_disconnect++;
	    }
#endif	  
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	}
    }

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  // error = 0;
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 err:
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  // print the current replication position 
  sql_print_error("Slave thread exiting, replication stopped in log '%s' at \
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position %s",
		  RPL_LOG_NAME, llstr(glob_mi.pos,llbuff));
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  thd->query = thd->db = 0; // extra safety
  if(mysql)
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      mc_mysql_close(mysql);
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  thd->proc_info = "Waiting for slave mutex on exit";
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  pthread_mutex_lock(&LOCK_slave);
  slave_running = 0;
  abort_slave = 0;
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  save_temporary_tables = thd->temporary_tables;
  thd->temporary_tables = 0; // remove tempation from destructor to close them
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  pthread_cond_broadcast(&COND_slave_stopped); // tell the world we are done
  pthread_mutex_unlock(&LOCK_slave);
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  net_end(&thd->net); // destructor will not free it, because we are weird
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  slave_thd = 0;
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  delete thd;
  my_thread_end();
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#ifndef DBUG_OFF
  if(abort_slave_event_count && !events_till_abort)
    goto slave_begin;
#endif  
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  pthread_exit(0);
  DBUG_RETURN(0);				// Can't return anything here
}

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/* try to connect until successful or slave killed */

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static int safe_connect(THD* thd, MYSQL* mysql, MASTER_INFO* mi)
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{
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  int slave_was_killed;
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#ifndef DBUG_OFF
  events_till_disconnect = disconnect_slave_event_count;
#endif  
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  while(!(slave_was_killed = slave_killed(thd)) &&
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	!mc_mysql_connect(mysql, mi->host, mi->user, mi->password, 0,
			  mi->port, 0, 0))
  {
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    sql_print_error("Slave thread: error connecting to master:%s(%d),\
 retry in %d sec", mc_mysql_error(mysql), errno, mi->connect_retry);
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    safe_sleep(thd, mi->connect_retry);
  }
  
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  if(!slave_was_killed)
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    {
      mysql_log.write(thd, COM_CONNECT_OUT, "%s@%s:%d",
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		  mi->user, mi->host, mi->port);
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#ifdef SIGNAL_WITH_VIO_CLOSE
      thd->set_active_vio(mysql->net.vio);
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#endif      
    }
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  return slave_was_killed;
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}

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/* try to connect until successful or slave killed */
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static int safe_reconnect(THD* thd, MYSQL* mysql, MASTER_INFO* mi)
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{
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  int slave_was_killed;
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  char llbuff[22];

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 // if we lost connection after reading a state set event
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  // we will be re-reading it, so pending needs to be cleared
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  mi->pending = 0;
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#ifndef DBUG_OFF
  events_till_disconnect = disconnect_slave_event_count;
#endif
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  while(!(slave_was_killed = slave_killed(thd)) && mc_mysql_reconnect(mysql))
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  {
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    sql_print_error("Slave thread: error re-connecting to master:\
%s, last_errno=%d, retry in %d sec",
		    mc_mysql_error(mysql), errno, mi->connect_retry);
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     safe_sleep(thd, mi->connect_retry);
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  }
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  if(!slave_was_killed)
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    {
     sql_print_error("Slave: reconnected to master '%s@%s:%d',\
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replication resumed in log '%s' at position %s", glob_mi.user,
		    glob_mi.host, glob_mi.port,
		    RPL_LOG_NAME,
		    llstr(glob_mi.pos,llbuff));
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#ifdef SIGNAL_WITH_VIO_CLOSE
      thd->set_active_vio(mysql->net.vio);
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#endif      
    }
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  return slave_was_killed;
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}

#ifdef __GNUC__
template class I_List_iterator<i_string>;
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template class I_List_iterator<i_string_pair>;
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#endif