Neels Hofmeyr | 6aa871d | 2019-11-20 03:35:37 +0100 | [diff] [blame^] | 1 | /* Copyright 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| 2 | * |
| 3 | * All Rights Reserved |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU Affero General Public License as published by |
| 7 | * the Free Software Foundation; either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU Affero General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Affero General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <osmocom/core/timer.h> |
| 21 | #include <osmocom/hlr/timestamp.h> |
| 22 | |
| 23 | /* Central implementation to set a timestamp to the current time, in case we want to modify this in the future. */ |
| 24 | void timestamp_update(timestamp_t *timestamp) |
| 25 | { |
| 26 | struct timeval tv; |
| 27 | time_t raw; |
| 28 | struct tm utc; |
| 29 | /* The simpler way would be just time(&raw), but by using osmo_gettimeofday() we can also use |
| 30 | * osmo_gettimeofday_override for unit tests independent from real time. */ |
| 31 | osmo_gettimeofday(&tv, NULL); |
| 32 | raw = tv.tv_sec; |
| 33 | gmtime_r(&raw, &utc); |
| 34 | *timestamp = mktime(&utc); |
| 35 | } |
| 36 | |
| 37 | /* Calculate seconds since a given timestamp was taken. Return true for a valid age returned in age_p, return false if |
| 38 | * the timestamp is either in the future or the age surpasses uint32_t range. When false is returned, *age_p is set to |
| 39 | * UINT32_MAX. */ |
| 40 | bool timestamp_age(const timestamp_t *timestamp, uint32_t *age_p) |
| 41 | { |
| 42 | int64_t age64; |
| 43 | timestamp_t now; |
| 44 | timestamp_update(&now); |
| 45 | age64 = (int64_t)now - (int64_t)(*timestamp); |
| 46 | if (age64 < 0 || age64 > UINT32_MAX) { |
| 47 | *age_p = UINT32_MAX; |
| 48 | return false; |
| 49 | } |
| 50 | *age_p = (uint32_t)age64; |
| 51 | return true; |
| 52 | } |
| 53 | |