Function ly_ctx_set_ext_data_clb 

pub unsafe extern "C" fn ly_ctx_set_ext_data_clb(
    ctx: *const ly_ctx,
    clb: ly_ext_data_clb,
    user_data: *mut c_void,
) -> ly_ext_data_clb

@brief Set callback providing run-time extension instance data. The expected data depend on the extension. Data expected by internal extensions:

• ietf-yang-schema-mount:mount-point (struct lyd_node **ext_data)\n Operational data tree with at least ietf-yang-library data describing the mounted schema and ietf-yang-schema-mount validated data describing the specific mount point (ref).

@param[in] ctx Context that will use this callback. @param[in] clb Callback responsible for returning the extension instance data. @param[in] user_data Arbitrary data that will always be passed to the callback @p clb.