| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef _RESOLV_PARAMS_H |
| #define _RESOLV_PARAMS_H |
| |
| #include <stdint.h> |
| |
| /* Hard-coded defines */ |
| #define MAXNS 4 /* max # name servers we'll track */ |
| #define MAXDNSRCH 6 /* max # domains in search path */ |
| #define MAXDNSRCHPATH 256 /* max length of domain search paths */ |
| #define MAXNSSAMPLES 64 /* max # samples to store per server */ |
| |
| /* Defaults used for initializing __res_params */ |
| #define SUCCESS_THRESHOLD 75 /* if successes * 100 / total_samples is less than |
| * this value, the server is considered failing |
| */ |
| #define NSSAMPLE_VALIDITY 1800 /* Sample validity in seconds. |
| * Set to -1 to disable skipping failing |
| * servers. |
| */ |
| |
| /* per-netid configuration parameters passed from netd to the resolver */ |
| struct __res_params { |
| uint16_t sample_validity; // sample lifetime in s |
| // threshold of success / total samples below which a server is considered broken |
| uint8_t success_threshold; // 0: disable, value / 100 otherwise |
| uint8_t min_samples; // min # samples needed for statistics to be considered meaningful |
| uint8_t max_samples; // max # samples taken into account for statistics |
| } __attribute__((__packed__)); |
| |
| #endif // _RESOLV_PARAMS_H |