WL#3015: Logging Improvements - No Restarts(ver N4)

Added slow_query_log & general_log global upadatable variables.
Added slow-query-log & general-log startup options.
Added log_output, general_log_file, slow_query_log_file global updatable variables.


mysql-test/r/show_check.result:
  WL#3015: Logging Improvements - No Restarts
  result fix
sql/log.cc:
  WL#3015: Logging Improvements - No Restarts
  added methods to LOGGER class
  void deactivate_log_handlers(THD* thd, uint log_type);
  bool activate_log_handlers(THD* thd, uint log_type);
  added methods to Log_to_file_event_handler:
  TABLE_LIST *get_mysql_slow_log()
  TABLE_LIST *get_mysql_log()
sql/log.h:
  WL#3015: Logging Improvements - No Restarts
  added methods to LOGGER class
  void deactivate_log_handlers(THD* thd, uint log_type);
  bool activate_log_handlers(THD* thd, uint log_type);
  added methods to Log_to_file_event_handler:
  TABLE_LIST *get_mysql_slow_log()
  TABLE_LIST *get_mysql_log()
sql/mysql_priv.h:
  WL#3015: Logging Improvements - No Restarts
sql/mysqld.cc:
  WL#3015: Logging Improvements - No Restarts
  added 'slow-query-log' & 'general-log' options
sql/set_var.cc:
  WL#3015: Logging Improvements - No Restarts
  added 'slow_query_log' & 'general_log' updatable variables
  added 'log_output', 'general_log_file', 'slow_query_log_file' updatable variables
sql/set_var.h:
  WL#3015: Logging Improvements - No Restarts
  new class sys_var_log_state
  new class sys_var_log_output
sql/share/errmsg.txt:
  WL#3015: Logging Improvements - No Restarts
  added error message
sql/sql_delete.cc:
  WL#3015: Logging Improvements - No Restarts
  'truncate table slow_log|general', keep status of logs

1 files changed, 122 insertions, 0 deletions

diff --git a/mysql-test/t/log_state.test b/mysql-test/t/log_state.test
new file mode 100644
index 00000000000..d3dec841dc1
--- /dev/null
+++ b/mysql-test/t/log_state.test
@@ -0,0 +1,122 @@
+-- source include/not_embedded.inc
+--source include/have_csv.inc
+
+--disable_ps_protocol
+set global general_log= OFF;
+truncate table mysql.general_log;
+truncate table mysql.slow_log;
+show global variables
+where Variable_name = 'log' or Variable_name = 'log_slow_queries' or
+Variable_name = 'general_log' or Variable_name = 'slow_query_log';
+flush logs;
+set global general_log= ON;
+create table t1(f1 int);
+--replace_column 1 TIMESTAMP 3 #
+select * from mysql.general_log;
+set global general_log= OFF;
+drop table t1;
+--replace_column 1 TIMESTAMP 3 #
+select * from mysql.general_log;
+set global general_log= ON;
+flush logs;
+show global variables
+where Variable_name = 'log' or Variable_name = 'log_slow_queries' or
+Variable_name = 'general_log' or Variable_name = 'slow_query_log';
+
+connect (con1,localhost,root,,);
+connection con1;
+set session long_query_time=1;
+select sleep(2);
+--replace_column 1 TIMESTAMP, 3 USER_HOST, 4 QUERY_TIME
+select * from mysql.slow_log;
+connection default;
+
+set global slow_query_log= ON;
+connection con1;
+set session long_query_time=1;
+select sleep(2);
+--replace_column 1 TIMESTAMP, 3 USER_HOST, 4 QUERY_TIME
+select * from mysql.slow_log;
+disconnect con1;
+connection default;
+show global variables
+where Variable_name = 'log' or Variable_name = 'log_slow_queries' or
+Variable_name = 'general_log' or Variable_name = 'slow_query_log';
+
+set global general_log= ON;
+set global general_log= OFF;
+set global general_log= OFF;
+set global slow_query_log= ON;
+set global slow_query_log= OFF;
+set global slow_query_log= OFF;
+
+set global general_log= ON;
+truncate table mysql.general_log;
+create table t1(f1 int);
+drop table t1;
+--replace_column 1 TIMESTAMP 3 #
+select * from mysql.general_log;
+set global general_log= OFF;
+truncate table mysql.general_log;
+--replace_column 1 TIMESTAMP 3 #
+select * from mysql.general_log;
+set global general_log= ON;
+show global variables
+where Variable_name = 'log' or Variable_name = 'log_slow_queries' or
+Variable_name = 'general_log' or Variable_name = 'slow_query_log';
+
+--replace_column 2 #
+show variables like 'general_log_file';
+--replace_column 2 #
+show variables like 'slow_query_log_file';
+show variables like 'log_output';
+
+--error 1231
+set global general_log_file='/not exiting path/log.master';
+--error 1231
+set global general_log_file='/tmp';
+--error 1231
+set global general_log_file='';
+--replace_column 2 #
+show variables like 'general_log_file';
+set global general_log= OFF;
+set global general_log_file='/tmp/log.master';
+set global general_log= ON;
+create table t1(f1 int);
+drop table t1;
+set global general_log= OFF;
+set global general_log_file=default;
+set global general_log= ON;
+create table t1(f1 int);
+drop table t1;
+--replace_column 2 #
+show variables like 'general_log_file';
+--replace_column 2 #
+show variables like 'slow_query_log_file';
+
+set global general_log= default;
+set global slow_query_log= default;
+set global general_log_file= default;
+set global slow_query_log_file= default;
+show variables like 'general_log';
+show variables like 'slow_query_log';
+set global general_log=ON;
+set global log_output=default;
+show variables like 'log_output';
+set global general_log=OFF;
+set global log_output=FILE;
+truncate table mysql.general_log;
+show variables like 'log_output';
+set global general_log=ON;
+create table t1(f1 int);
+--replace_column 1 TIMESTAMP 3 #
+select * from mysql.general_log;
+set global general_log=OFF;
+set global log_output="FILE,TABLE";
+show variables like 'log_output';
+set global general_log=ON;
+drop table t1;
+--replace_column 1 TIMESTAMP 3 #
+select * from mysql.general_log;
+
+--enable_ps_protocol