Great news,
> Of course, we can write a new function and register every
> root talloc context using it. What about that?
I just found, that talloc context may be specified in vty_app_info
structure:
/*! Information an application registers with the VTY */
struct vty_app_info {
/*! \brief name of the application */
const char *name;
/*! \brief version string of the application */
const char *version;
/*! \brief copyright string of the application */
const char *copyright;
/*! \brief \ref talloc context */
void *tall_ctx;
// ...
}