Bug#14324766:PARTIALLY WRITTEN INSERT STATEMENT IN BINLOG

NO ERRORS REPORTED
      
Problem:
=======
Errors from my_b_fill are ignored. MYSQL_BIN_LOG::write_cache
code assumes that 0 returned from my_b_fill always means
end-of-cache, but that is incorrect. It can result in error
and the error is ignored. Other callers of my_b_fill don't
check for error: my_b_copy_to_file, maybe my_b_gets.
      
Fix:
===
An error handler is already present to check the "cache"
error that is reported during "MYSQL_BIN_LOG::write_cache"
call. Hence error handlers are added for "my_b_copy_to_file"
and "my_b_gets".
During my_b_fill() function call, when the cache read fails
info->error= -1 is set. Hence a check for "info->error"
is added for the above to callers upon their return.

sql/sql_repl.cc

@@ -1732,6 +1732,8 @@ bool show_binlogs(THD* thd)
     if (protocol->write())
       goto err;
   }
+  if(index_file->error == -1)
+    goto err;
   mysql_bin_log.unlock_index();
   my_eof(thd);
   DBUG_RETURN(FALSE);