BUG#21627629 - --DAEMONIZE: DON'T ENFORCE REDIRECTION IS LOG-ERROR

	        OPTION IS IN USE.

The patch does not log error if log-error option is
specified along with daemonize and the stderr and stdout
file descriptor are connected to a terminal type device.

Author: thayumanavar77

sql/mysqld.cc

@@ -4403,10 +4403,12 @@ int mysqld_main(int argc, char **argv)
     exit(MYSQLD_ABORT_EXIT);
   }
 
-  if (opt_daemonize && (isatty(STDOUT_FILENO) || isatty(STDERR_FILENO)))
+  if (opt_daemonize && log_error_dest == disabled_my_option &&
+      (isatty(STDOUT_FILENO) || isatty(STDERR_FILENO)))
   {
-    fprintf(stderr, "Please set appopriate redirections for "
-                    "standard output and/or standard error in daemon mode.\n");
+    fprintf(stderr, "Please enable --log-error option or set appropriate "
+                    "redirections for standard output and/or standard error "
+                    "in daemon mode.\n");
     exit(MYSQLD_ABORT_EXIT);
   }
 

sql/sys_vars.cc

@@ -1955,7 +1955,9 @@ static Sys_var_charptr Sys_log_error(
        "log_error", "Error log file",
        READ_ONLY GLOBAL_VAR(log_error_dest),
        CMD_LINE(OPT_ARG, OPT_LOG_ERROR),
-       IN_FS_CHARSET, DEFAULT(disabled_my_option));
+       IN_FS_CHARSET, DEFAULT(disabled_my_option), NO_MUTEX_GUARD,
+       NOT_IN_BINLOG, ON_CHECK(NULL), ON_UPDATE(NULL),
+       NULL, sys_var::PARSE_EARLY);
 
 static Sys_var_mybool Sys_log_queries_not_using_indexes(
        "log_queries_not_using_indexes",