MySQL 5.6 C API Developer Guide
int mysql_plugin_options(struct st_mysql_client_plugin *plugin, const char *option, const void *value)
Passes an option type and value to a plugin. This function can be called multiple times to set several options. If the plugin does not have an option handler, an error occurs.
Specify the arguments as follows:
plugin
: A pointer to the plugin
structure.
option
: The option to be set.
value
: A pointer to the option value.