more predicatable slave behaviour with wait_for_slave_stop in mysqltest

fixed a couple of bugs with SEQ_READ_APPEND cache
rpl000016 still has non-deterministic result, but I am going to commit and
push since what I have is now better than what is in the main repository


client/mysqltest.c:
  added wait_for_slave_to_stop
  cleaned up TODO and comments
include/my_sys.h:
  fixed race in flush_io_cache in SEQ_READ_APPEND cache
mysql-test/r/rpl000016.result:
  updated result
mysql-test/t/rpl000016.test:
  use wait_for_slave_to_stop to have deterministic slave behaviour for the test
mysys/mf_iocache.c:
  fixed race in flush_io_cache()
  fixed failure to unlock mutex in my_b_append()
sql/log.cc:
  be compatible with 3.23 master
sql/log_event.cc:
  3.23 master compat
sql/slave.cc:
  3.23 master compat
sql/sql_class.h:
  compat with 3.23 master

client/mysqltest.c

@@ -15,7 +15,8 @@
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
 /* mysqltest test tool
- * See man page for more information.
+ * See the manual for more information
+ * TODO: document better how mysqltest works
  *
  * Written by:
  *   Sasha Pachev <sasha@mysql.com>
@@ -26,9 +27,6 @@
 /**********************************************************************
   TODO:
 
-- Print also the queries that returns a result to the log file;  This makes
-  it much easier to find out what's wrong.
-
 - Do comparison line by line, instead of doing a full comparison of
   the text file.  This will save space as we don't need to keep many
   results in memory.  It will also make it possible to do simple
@@ -43,7 +41,7 @@
 
 **********************************************************************/
 
-#define MTEST_VERSION "1.13"
+#define MTEST_VERSION "1.14"
 
 #include <my_global.h>
 #include <mysql_embed.h>
@@ -88,6 +86,12 @@
 #define CON_RETRY_SLEEP 2
 #define MAX_CON_TRIES   5
 
+#ifndef OS2
+#define SLAVE_POLL_INTERVAL 300000 /* 0.3 of a sec */
+#else
+#defile SLAVE_POLL_INTERVAL 0.3
+#endif
+
 enum {OPT_MANAGER_USER=256,OPT_MANAGER_HOST,OPT_MANAGER_PASSWD,
       OPT_MANAGER_PORT,OPT_MANAGER_WAIT_TIMEOUT};
 
@@ -187,6 +191,7 @@ Q_DISABLE_RPL_PARSE, Q_EVAL_RESULT,
 Q_ENABLE_QUERY_LOG, Q_DISABLE_QUERY_LOG,
 Q_ENABLE_RESULT_LOG, Q_DISABLE_RESULT_LOG,
 Q_SERVER_START, Q_SERVER_STOP,Q_REQUIRE_MANAGER,
+Q_WAIT_FOR_SLAVE_TO_STOP,
 Q_UNKNOWN,                             /* Unknown command.   */
 Q_COMMENT,                             /* Comments, ignored. */
 Q_COMMENT_WITH_COMMAND
@@ -222,7 +227,7 @@ const char *command_names[] = {
   "enable_query_log", "disable_query_log",
   "enable_result_log", "disable_result_log",
   "server_start", "server_stop",
-  "require_manager",
+  "require_manager", "wait_for_slave_to_stop",
   0
 };
 
@@ -653,6 +658,45 @@ int open_file(const char* name)
   return 0;
 }
 
+/* ugly long name, but we are following the convention */
+int do_wait_for_slave_to_stop(struct st_query* __attribute__((unused)) q)
+{
+  MYSQL* mysql = &cur_con->mysql;
+#ifndef OS2 
+  struct timeval t;
+#endif
+  for (;;)
+  {
+    MYSQL_RES* res;
+    MYSQL_ROW row;
+    int done;
+    LINT_INIT(res);
+    
+    if (mysql_query(mysql,"show status like 'Slave_running'")
+	|| !(res=mysql_store_result(mysql)))
+      die("Query failed while probing slave for stop: %s",
+	  mysql_error(mysql));
+    if (!(row=mysql_fetch_row(res)) || !row[1])
+    {
+      mysql_free_result(res);
+      die("Strange result from query while probing slave for stop");
+    }
+    done = !strcmp(row[1],"OFF");
+    mysql_free_result(res);
+    if (done)
+      break;
+#ifndef OS2  
+    t.tv_sec=0;
+    t.tv_usec=SLAVE_POLL_INTERVAL;
+    select(0,0,0,0,&t); /* sleep */
+#else
+    DosSleep(OS2_SLAVE_POLL_INTERVAL);
+#endif
+  }
+  
+  return 0;
+}
+
 int do_require_manager(struct st_query* __attribute__((unused)) q)
 {
   if (!manager)
@@ -2335,6 +2379,7 @@ int main(int argc, char** argv)
       case Q_DISABLE_RESULT_LOG: disable_result_log=1; break;
       case Q_SOURCE: do_source(q); break;
       case Q_SLEEP: do_sleep(q); break;
+      case Q_WAIT_FOR_SLAVE_TO_STOP: do_wait_for_slave_to_stop(q); break;
       case Q_REQUIRE_MANAGER: do_require_manager(q); break;
 #ifndef EMBEDDED_LIBRARY	
       case Q_SERVER_START: do_server_start(q); break;

include/my_sys.h

@@ -643,7 +643,10 @@ extern int _my_b_write(IO_CACHE *info,const byte *Buffer,uint Count);
 extern int my_b_append(IO_CACHE *info,const byte *Buffer,uint Count);
 extern int my_block_write(IO_CACHE *info, const byte *Buffer,
 			  uint Count, my_off_t pos);
-extern int flush_io_cache(IO_CACHE *info);
+extern int _flush_io_cache(IO_CACHE *info, int need_append_buffer_lock);
+
+#define flush_io_cache(info) _flush_io_cache((info),1)
+
 extern int end_io_cache(IO_CACHE *info);
 extern uint my_b_fill(IO_CACHE *info);
 extern void my_b_seek(IO_CACHE *info,my_off_t pos);

mysql-test/r/rpl000016.result

@@ -33,7 +33,6 @@ master-bin.003
 insert into t2 values(1234);
 set insert_id=1234;
 insert into t2 values(NULL);
-slave stop;
 set sql_slave_skip_counter=1;
 slave start;
 purge master logs to 'master-bin.003';
@@ -66,7 +65,7 @@ slave stop;
 slave start;
 show slave status;
 Master_Host	Master_User	Master_Port	Connect_retry	Master_Log_File	Read_Master_Log_Pos	Relay_Log_File	Relay_Log_Pos	Relay_Master_Log_File	Slave_IO_Running	Slave_SQL_Running	Replicate_do_db	Replicate_ignore_db	Last_errno	Last_error	Skip_counter	Exec_master_log_pos
-127.0.0.1	root	MASTER_PORT	60	master-bin.006	445	mysql-relay-bin.004	1312	master-bin.006	Yes	Yes			0		0	445
+127.0.0.1	root	MASTER_PORT	60	master-bin.006	445	mysql-relay-bin.004	1376	master-bin.006	Yes	Yes			0		0	445
 lock tables t3 read;
 select count(*) from t3 where n >= 4;
 count(*)

mysql-test/t/rpl000016.test

@@ -51,9 +51,7 @@ insert into t2 values(NULL);
 connection slave;
 sync_with_master;
 
-#the slave may have already stopped, so we ignore the error
---error 0,1199
-!slave stop;
+wait_for_slave_to_stop;
 
 #restart slave skipping one event
 set sql_slave_skip_counter=1;

mysys/mf_iocache.c

@@ -808,13 +808,19 @@ int my_b_append(register IO_CACHE *info, const byte *Buffer, uint Count)
   Buffer+=rest_length;
   Count-=rest_length;
   info->write_pos+=rest_length;
-  if (flush_io_cache(info))
+  if (_flush_io_cache(info,0))
+  {
+    unlock_append_buffer(info);
     return 1;
+  }
   if (Count >= IO_SIZE)
   {					/* Fill first intern buffer */
     length=Count & (uint) ~(IO_SIZE-1);
     if (my_write(info->file,Buffer,(uint) length,info->myflags | MY_NABP))
+    {
+      unlock_append_buffer(info);
       return info->error= -1;
+    }
     Count-=length;
     Buffer+=length;
   }
@@ -883,14 +889,16 @@ int my_block_write(register IO_CACHE *info, const byte *Buffer, uint Count,
 
 	/* Flush write cache */
 
-int flush_io_cache(IO_CACHE *info)
+int _flush_io_cache(IO_CACHE *info, int need_append_buffer_lock)
 {
   uint length;
   my_bool append_cache;
   my_off_t pos_in_file;
   DBUG_ENTER("flush_io_cache");
 
-  append_cache = (info->type == SEQ_READ_APPEND);
+  if (!(append_cache = (info->type == SEQ_READ_APPEND)))
+    need_append_buffer_lock=0;
+  
   if (info->type == WRITE_CACHE || append_cache)
   {
     if (info->file == -1)
@@ -898,6 +906,8 @@ int flush_io_cache(IO_CACHE *info)
       if (real_open_cached_file(info))
 	DBUG_RETURN((info->error= -1));
     }
+    if (need_append_buffer_lock)
+      lock_append_buffer(info);
     if ((length=(uint) (info->write_pos - info->write_buffer)))
     {
       pos_in_file=info->pos_in_file;
@@ -909,6 +919,8 @@ int flush_io_cache(IO_CACHE *info)
 	if (my_seek(info->file,pos_in_file,MY_SEEK_SET,MYF(0)) ==
 	    MY_FILEPOS_ERROR)
 	{
+	  if (need_append_buffer_lock)
+	    unlock_append_buffer(info);
 	  DBUG_RETURN((info->error= -1));
 	}
 	if (!append_cache)
@@ -932,6 +944,8 @@ int flush_io_cache(IO_CACHE *info)
 	info->end_of_file+=(info->write_pos-info->append_read_pos);
       
       info->append_read_pos=info->write_pos=info->write_buffer;
+      if (need_append_buffer_lock)
+        unlock_append_buffer(info);
       DBUG_RETURN(info->error);
     }
   }
@@ -942,6 +956,8 @@ int flush_io_cache(IO_CACHE *info)
     info->inited=0;
   }
 #endif
+  if (need_append_buffer_lock)
+    unlock_append_buffer(info);
   DBUG_RETURN(0);
 }
 

sql/log.cc

@@ -703,12 +703,37 @@ void MYSQL_LOG::new_file(bool inside_mutex)
   }
 }
 
+bool MYSQL_LOG::append(Log_event* ev)
+{
+  bool error = 0;
+  pthread_mutex_lock(&LOCK_log);
+  
+  DBUG_ASSERT(log_file.type == SEQ_READ_APPEND);
+  // Log_event::write() is smart enough to use my_b_write() or
+  // my_b_append() depending on the kind of cache we have
+  if (ev->write(&log_file))
+  {
+    error=1;
+    goto err;
+  }
+  if ((uint)my_b_append_tell(&log_file) > max_binlog_size)
+  {
+    new_file(1);
+  }
+  signal_update();
+err:  
+  pthread_mutex_unlock(&LOCK_log);
+  return error;
+}
+
 bool MYSQL_LOG::appendv(const char* buf, uint len,...)
 {
   bool error = 0;
   va_list(args);
   va_start(args,len);
   
+  DBUG_ASSERT(log_file.type == SEQ_READ_APPEND);
+  
   pthread_mutex_lock(&LOCK_log);
   do
   {

sql/log_event.cc

@@ -26,6 +26,18 @@
 
 #include <assert.h>
 
+inline int my_b_safe_write(IO_CACHE* file, const char* buf,
+			      int len)
+{
+  // Sasha: We are not writing this with the ? operator to avoid hitting
+  // a possible compiler bug. At least gcc 2.95 cannot deal with 
+  // several layers of ternary operators that evaluated comma(,) operator
+  // expressions inside - I do have a test case if somebody wants it
+  if (file->type == SEQ_READ_APPEND)
+    return my_b_append(file,buf,len);
+  return my_b_write(file,buf,len);
+ }
+
 #ifdef MYSQL_CLIENT
 static void pretty_print_str(FILE* file, char* str, int len)
 {
@@ -403,7 +415,7 @@ int Log_event::write_header(IO_CACHE* file)
   pos += 4;
   int2store(pos, flags);
   pos += 2;
-  return (my_b_write(file, (byte*) buf, (uint) (pos - buf)));
+  return (my_b_safe_write(file, (byte*) buf, (uint) (pos - buf)));
 }
 
 #ifndef MYSQL_CLIENT
@@ -677,7 +689,7 @@ int Start_log_event::write_data(IO_CACHE* file)
   int2store(buff + ST_BINLOG_VER_OFFSET,binlog_version);
   memcpy(buff + ST_SERVER_VER_OFFSET,server_version,ST_SERVER_VER_LEN);
   int4store(buff + ST_CREATED_OFFSET,created);
-  return (my_b_write(file, (byte*) buff, sizeof(buff)) ? -1 : 0);
+  return (my_b_safe_write(file, (byte*) buff, sizeof(buff)) ? -1 : 0);
 }
 
 Rotate_log_event::Rotate_log_event(const char* buf, int event_len,
@@ -714,8 +726,8 @@ int Rotate_log_event::write_data(IO_CACHE* file)
 {
   char buf[ROTATE_HEADER_LEN];
   int8store(buf, pos + R_POS_OFFSET);
-  return my_b_write(file, (byte*)buf, ROTATE_HEADER_LEN) ||
-    my_b_write(file, (byte*)new_log_ident, (uint) ident_len);
+  return my_b_safe_write(file, (byte*)buf, ROTATE_HEADER_LEN) ||
+    my_b_safe_write(file, (byte*)new_log_ident, (uint) ident_len);
 }
 
 #ifndef MYSQL_CLIENT
@@ -812,9 +824,9 @@ int Query_log_event::write_data(IO_CACHE* file)
   buf[Q_DB_LEN_OFFSET] = (char)db_len;
   int2store(buf + Q_ERR_CODE_OFFSET, error_code);
 
-  return (my_b_write(file, (byte*) buf, QUERY_HEADER_LEN) ||
-	  my_b_write(file, (db) ? (byte*) db : (byte*)"", db_len + 1) ||
-	  my_b_write(file, (byte*) query, q_len)) ? -1 : 0;
+  return (my_b_safe_write(file, (byte*) buf, QUERY_HEADER_LEN) ||
+	  my_b_safe_write(file, (db) ? (byte*) db : (byte*)"", db_len + 1) ||
+	  my_b_safe_write(file, (byte*) query, q_len)) ? -1 : 0;
 }
 
 Intvar_log_event::Intvar_log_event(const char* buf, bool old_format):
@@ -840,7 +852,7 @@ int Intvar_log_event::write_data(IO_CACHE* file)
   char buf[9];
   buf[I_TYPE_OFFSET] = type;
   int8store(buf + I_VAL_OFFSET, val);
-  return my_b_write(file, (byte*) buf, sizeof(buf));
+  return my_b_safe_write(file, (byte*) buf, sizeof(buf));
 }
 
 #ifdef MYSQL_CLIENT
@@ -878,7 +890,7 @@ int Load_log_event::write_data_header(IO_CACHE* file)
   buf[L_TBL_LEN_OFFSET] = (char)table_name_len;
   buf[L_DB_LEN_OFFSET] = (char)db_len;
   int4store(buf + L_NUM_FIELDS_OFFSET, num_fields);
-  return my_b_write(file, (byte*)buf, LOAD_HEADER_LEN);
+  return my_b_safe_write(file, (byte*)buf, LOAD_HEADER_LEN);
 }
 
 int Load_log_event::write_data_body(IO_CACHE* file)
@@ -886,20 +898,20 @@ int Load_log_event::write_data_body(IO_CACHE* file)
   if (sql_ex.write_data(file)) return 1;
   if (num_fields && fields && field_lens)
   {
-    if (my_b_write(file, (byte*)field_lens, num_fields) ||
-	my_b_write(file, (byte*)fields, field_block_len))
+    if (my_b_safe_write(file, (byte*)field_lens, num_fields) ||
+	my_b_safe_write(file, (byte*)fields, field_block_len))
       return 1;
   }
-  return (my_b_write(file, (byte*)table_name, table_name_len + 1) ||
-	  my_b_write(file, (byte*)db, db_len + 1) ||
-	  my_b_write(file, (byte*)fname, fname_len));
+  return (my_b_safe_write(file, (byte*)table_name, table_name_len + 1) ||
+	  my_b_safe_write(file, (byte*)db, db_len + 1) ||
+	  my_b_safe_write(file, (byte*)fname, fname_len));
 }
 
 
 static bool write_str(IO_CACHE *file, char *str, byte length)
 {
-  return (my_b_write(file, &length, 1) ||
-	  my_b_write(file, (byte*) str, (int) length));
+  return (my_b_safe_write(file, &length, 1) ||
+	  my_b_safe_write(file, (byte*) str, (int) length));
 }
 
 int sql_ex_info::write_data(IO_CACHE* file)
@@ -911,7 +923,7 @@ int sql_ex_info::write_data(IO_CACHE* file)
 	    write_str(file, line_term,  line_term_len) ||
 	    write_str(file, line_start, line_start_len) ||
 	    write_str(file, escaped,    escaped_len) ||
-	    my_b_write(file,(byte*) &opt_flags,1));
+	    my_b_safe_write(file,(byte*) &opt_flags,1));
   }
   else
   {
@@ -923,7 +935,7 @@ int sql_ex_info::write_data(IO_CACHE* file)
     old_ex.escaped=    *escaped;
     old_ex.opt_flags=  opt_flags;
     old_ex.empty_flags=empty_flags;
-    return my_b_write(file, (byte*) &old_ex, sizeof(old_ex));
+    return my_b_safe_write(file, (byte*) &old_ex, sizeof(old_ex));
   }
 }
 
@@ -1280,7 +1292,7 @@ int Slave_log_event::write_data(IO_CACHE* file)
   int8store(mem_pool + SL_MASTER_POS_OFFSET, master_pos);
   int2store(mem_pool + SL_MASTER_PORT_OFFSET, master_port);
   // log and host are already there
-  return my_b_write(file, (byte*)mem_pool, get_data_size());
+  return my_b_safe_write(file, (byte*)mem_pool, get_data_size());
 }
 
 void Slave_log_event::init_from_mem_pool(int data_size)
@@ -1330,8 +1342,8 @@ int Create_file_log_event::write_data_body(IO_CACHE* file)
   int res;
   if ((res = Load_log_event::write_data_body(file)) || fake_base)
     return res;
-  return (my_b_write(file, (byte*) "", 1) ||
-	  my_b_write(file, (byte*) block, block_len));
+  return (my_b_safe_write(file, (byte*) "", 1) ||
+	  my_b_safe_write(file, (byte*) block, block_len));
 }
 
 int Create_file_log_event::write_data_header(IO_CACHE* file)
@@ -1341,7 +1353,7 @@ int Create_file_log_event::write_data_header(IO_CACHE* file)
     return res;
   byte buf[CREATE_FILE_HEADER_LEN];
   int4store(buf + CF_FILE_ID_OFFSET, file_id);
-  return my_b_write(file, buf, CREATE_FILE_HEADER_LEN);
+  return my_b_safe_write(file, buf, CREATE_FILE_HEADER_LEN);
 }
 
 int Create_file_log_event::write_base(IO_CACHE* file)
@@ -1423,8 +1435,8 @@ int Append_block_log_event::write_data(IO_CACHE* file)
 {
   byte buf[APPEND_BLOCK_HEADER_LEN];
   int4store(buf + AB_FILE_ID_OFFSET, file_id);
-  return (my_b_write(file, buf, APPEND_BLOCK_HEADER_LEN) ||
-	  my_b_write(file, (byte*) block, block_len));
+  return (my_b_safe_write(file, buf, APPEND_BLOCK_HEADER_LEN) ||
+	  my_b_safe_write(file, (byte*) block, block_len));
 }
 
 #ifdef MYSQL_CLIENT  
@@ -1473,7 +1485,7 @@ int Delete_file_log_event::write_data(IO_CACHE* file)
 {
  byte buf[DELETE_FILE_HEADER_LEN];
  int4store(buf + DF_FILE_ID_OFFSET, file_id);
- return my_b_write(file, buf, DELETE_FILE_HEADER_LEN);
+ return my_b_safe_write(file, buf, DELETE_FILE_HEADER_LEN);
 }
 
 #ifdef MYSQL_CLIENT  
@@ -1520,7 +1532,7 @@ int Execute_load_log_event::write_data(IO_CACHE* file)
 {
   byte buf[EXEC_LOAD_HEADER_LEN];
   int4store(buf + EL_FILE_ID_OFFSET, file_id);
-  return my_b_write(file, buf, EXEC_LOAD_HEADER_LEN);
+  return my_b_safe_write(file, buf, EXEC_LOAD_HEADER_LEN);
 }
 
 #ifdef MYSQL_CLIENT  

sql/slave.cc

@@ -54,6 +54,9 @@ static int stuck_count = 0;
 typedef enum { SLAVE_THD_IO, SLAVE_THD_SQL} SLAVE_THD_TYPE;
 
 void skip_load_data_infile(NET* net);
+static int process_io_rotate(MASTER_INFO* mi, Rotate_log_event* rev);
+static int queue_old_event(MASTER_INFO* mi, const char* buf,
+			   uint event_len);
 static inline bool slave_killed(THD* thd,MASTER_INFO* mi);
 static inline bool slave_killed(THD* thd,RELAY_LOG_INFO* rli);
 static int init_slave_thread(THD* thd, SLAVE_THD_TYPE thd_type);
@@ -1918,34 +1921,86 @@ the slave SQL thread with \"mysqladmin start-slave\". We stopped at log \
   DBUG_RETURN(0);				// Can't return anything here
 }
 
+static int process_io_rotate(MASTER_INFO* mi, Rotate_log_event* rev)
+{
+  if (!rev->is_valid())
+    return 1;
+  DBUG_ASSERT(rev->ident_len<sizeof(mi->master_log_name));
+  memcpy(mi->master_log_name,rev->new_log_ident,
+	 rev->ident_len);
+  mi->master_log_name[rev->ident_len] = 0;
+  mi->master_log_pos = rev->pos;
+#ifndef DBUG_OFF
+    /* if we do not do this, we will be getting the first
+       rotate event forever, so
+       we need to not disconnect after one
+    */
+    if (disconnect_slave_event_count)
+      events_till_disconnect++;
+#endif
+    return 0;
+}
+
+static int queue_old_event(MASTER_INFO* mi, const char* buf,
+			   uint event_len)
+{
+  const char* errmsg = 0;
+  bool inc_pos = 1;
+  Log_event* ev = Log_event::read_log_event(buf,event_len, &errmsg,
+					    1/*old format*/);
+  if (!ev)
+  {
+    sql_print_error("Read invalid event from master: '%s',\
+ master could be corrupt  but a more likely cause of this is a bug",
+		    errmsg);
+    return 1;
+  }
+  ev->log_pos = mi->master_log_pos;
+  switch (ev->get_type_code())
+  {
+  case ROTATE_EVENT:
+    if (process_io_rotate(mi,(Rotate_log_event*)ev))
+    {
+      delete ev;
+      return 1;
+    }
+    inc_pos = 0;
+    break;
+  case LOAD_EVENT:
+    // TODO: actually process it
+    mi->master_log_pos += event_len;
+    return 0;
+    break;
+  default:
+    break;
+  }
+  if (mi->rli.relay_log.append(ev))
+  {
+    delete ev;
+    return 1;
+  }
+  delete ev;
+  if (inc_pos)
+    mi->master_log_pos += event_len;
+  return 0;
+}
+
 int queue_event(MASTER_INFO* mi,const char* buf,uint event_len)
 {
   int error;
   bool inc_pos = 1;
   if (mi->old_format)
-    return 1; // TODO: deal with old format
-  
+    return queue_old_event(mi,buf,event_len);
+  // TODO: figure out if other events in addition to Rotate
+  // require special processing
   switch (buf[EVENT_TYPE_OFFSET])
   {
   case ROTATE_EVENT:
   {
     Rotate_log_event rev(buf,event_len,0);
-    if (!rev.is_valid())
+    if (process_io_rotate(mi,&rev))
       return 1;
-    DBUG_ASSERT(rev.ident_len<sizeof(mi->master_log_name));
-    memcpy(mi->master_log_name,rev.new_log_ident,
-	    rev.ident_len);
-    mi->master_log_name[rev.ident_len] = 0;
-    mi->master_log_pos = rev.pos;
-    inc_pos = 0;
-#ifndef DBUG_OFF
-    /* if we do not do this, we will be getting the first
-       rotate event forever, so
-       we need to not disconnect after one
-    */
-    if (disconnect_slave_event_count)
-      events_till_disconnect++;
-#endif    
+    inc_pos=0;
     break;
   }
   default:

sql/sql_class.h

@@ -108,6 +108,7 @@ class MYSQL_LOG {
   //v stands for vector
   //invoked as appendv(buf1,len1,buf2,len2,...,bufn,lenn,0)
   bool appendv(const char* buf,uint len,...);
+  bool append(Log_event* ev);
   
   int generate_new_name(char *new_name,const char *old_name);
   void make_log_name(char* buf, const char* log_ident);