process_rr
process_rr, process_genm, process_error,
OSSL_CMP_SRV_rr_cb_t process_rr;
if ((si = srv_ctx->process_rr(srv_ctx, req, issuer, serial)) == NULL)
if (srv_ctx->process_rr == NULL)
rsp = process_rr(srv_ctx, req);
OSSL_CMP_SRV_rr_cb_t process_rr,
srv_ctx->process_rr = process_rr;
process_rr, process_genm, process_error,
OSSL_CMP_SRV_rr_cb_t process_rr,