bzr commit into mysql-next-mr branch (andrei.elkin:3194) Bug#58063

[Andrei Elkin]

#At file:///home/andrei/MySQL/BZR/2a-23May/WL/mysql-next-mr-wl2540/ based on revid:andrei.elkin@stripped

 3194 Andrei Elkin	2010-11-08
      Bug #58063  	rpl_server_uuid segfaults on win
      
      This is an intermediate patch to get more details out of the failure.
     @ sql/log_event.cc
        compilation warning is fixed.
     @ sql/rpl_slave.cc
        Printing out more info in case Win run of rpl_server_id discovers unexpected NULL
        as the value of @master_binlog_checksum.

    modified:
      sql/log_event.cc
      sql/rpl_slave.cc
=== modified file 'sql/log_event.cc'
--- a/sql/log_event.cc	2010-11-02 19:57:34 +0000
+++ b/sql/log_event.cc	2010-11-08 21:00:21 +0000
@@ -739,7 +739,7 @@ const char* Log_event::get_type_str()
 #ifndef MYSQL_CLIENT
 Log_event::Log_event(THD* thd_arg, uint16 flags_arg, bool using_trans)
   :log_pos(0), temp_buf(0), exec_time(0), flags(flags_arg),
-   cache_type(Log_event::EVENT_INVALID_CACHE), thd(thd_arg), crc(0),
+   cache_type(Log_event::EVENT_INVALID_CACHE), crc(0), thd(thd_arg),
    checksum_alg(BINLOG_CHECKSUM_ALG_UNDEF)
 {
   server_id=	thd->server_id;

=== modified file 'sql/rpl_slave.cc'
--- a/sql/rpl_slave.cc	2010-11-02 12:43:13 +0000
+++ b/sql/rpl_slave.cc	2010-11-08 21:00:21 +0000
@@ -1691,6 +1691,7 @@ when it try to get the value of TIME_ZON
                   goto past_checksum;);
   {
     int rc;
+    ulong thread_id= mysql->thread_id;
     const char query[]= "SET @master_binlog_checksum= @@global.binlog_checksum";
     master_res= NULL;
     mi->checksum_alg_before_fd= BINLOG_CHECKSUM_ALG_UNDEF; //initially undefined
@@ -1742,6 +1743,19 @@ when it try to get the value of TIME_ZON
           (master_res= mysql_store_result(mysql)) &&
           (master_row= mysql_fetch_row(master_res)))
       {
+#ifndef DBUG_OFF
+        if (master_row[0] == NULL)
+        {
+          errmsg= "The slave I/O thread stops because a fatal error is "
+            "encountered when it tried to SELECT @master_binlog_checksum. "
+            "The setting time thread_id %lu, the current thread_i %lu; "
+            "reconnecting %d.";
+          err_code= ER_SLAVE_FATAL_ERROR;
+          sprintf(err_buff, errmsg, thread_id, mysql->thread_id,
+                  mysql->reconnect);
+          goto err;
+        }
+#endif
         mi->checksum_alg_before_fd= (uint8)
           find_type(master_row[0], &binlog_checksum_typelib, 1) - 1;
         // valid outcome is either of


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