Function ng_make_node

lib/ff_ng_base.c:598–638

* Instantiate a node of the requested type */

 * Instantiate a node of the requested type
 */
int
ng_make_node(const char *typename, node_p *nodepp)
{
    struct ng_type *type;
    int    error;

    /* Check that the type makes sense */
    if (typename == NULL) {
        TRAP_ERROR();
        return (EINVAL);
    }

    /* Locate the node type. If we fail we return. Do not try to load
     * module.
     */
    if ((type = ng_findtype(typename)) == NULL)
        return (ENXIO);

    /*
     * If we have a constructor, then make the node and
     * call the constructor to do type specific initialisation.
     */
    if (type->constructor != NULL) {
        if ((error = ng_make_node_common(type, nodepp)) == 0) {
            if ((error = ((*type->constructor)(*nodepp))) != 0) {
                NG_NODE_UNREF(*nodepp);
            }
        }
    } else {
        /*
         * Node has no constructor. We cannot ask for one
         * to be made. It must be brought into existence by
         * some external agency. The external agency should
         * call ng_make_node_common() directly to get the
         * netgraph part initialised.
         */
        TRAP_ERROR();
        error = EINVAL;
    }
    return (error);
}

/*
 * Generic node creation. Called by node initialisation for externally