typedef int (*SilcConfigCallback)(SilcConfigType type, const char *name,
                                      SilcUInt32 line, void *val,
                                      void *context);

    This is the callback prototype for the options handler.  The pointer
    `val' points to a location of type described by `type'.  `name' points
    to a null-terminated string with the name of the option which triggered
    this callback, that is stated at line `line'.  `context' is the
    user-specified context provided when this option was registered.