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-rw-r--r--sql/set_var.h29
1 files changed, 28 insertions, 1 deletions
diff --git a/sql/set_var.h b/sql/set_var.h
index ab819694e09..6b62d62706e 100644
--- a/sql/set_var.h
+++ b/sql/set_var.h
@@ -929,6 +929,34 @@ public:
};
+/**
+ Global-only, read-only variable. E.g. command line option.
+*/
+
+class sys_var_const: public sys_var
+{
+public:
+ enum_var_type var_type;
+ SHOW_TYPE show_type_value;
+ uchar *ptr;
+ sys_var_const(sys_var_chain *chain, const char *name_arg, enum_var_type type,
+ SHOW_TYPE show_type_arg, uchar *ptr_arg)
+ :sys_var(name_arg), var_type(type),
+ show_type_value(show_type_arg), ptr(ptr_arg)
+ { chain_sys_var(chain); }
+ bool update(THD *thd, set_var *var) { return 1; }
+ bool check_default(enum_var_type type) { return 1; }
+ bool check_type(enum_var_type type) { return type != var_type; }
+ bool check_update_type(Item_result type) { return 1; }
+ uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
+ {
+ return ptr;
+ }
+ SHOW_TYPE show_type() { return show_type_value; }
+ bool is_readonly() const { return 1; }
+};
+
+
class sys_var_have_option: public sys_var
{
protected:
@@ -1317,7 +1345,6 @@ struct sys_var_with_base
int set_var_init();
void set_var_free();
-int mysql_append_static_vars(const SHOW_VAR *show_vars, uint count);
SHOW_VAR* enumerate_sys_vars(THD *thd, bool sorted);
int mysql_add_sys_var_chain(sys_var *chain, struct my_option *long_options);
int mysql_del_sys_var_chain(sys_var *chain);