| 1 | /* |
| 2 | * Copyright (C) 2023 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #ifndef LTTNG_RANDOM_H |
| 9 | #define LTTNG_RANDOM_H |
| 10 | |
| 11 | #include <stddef.h> |
| 12 | |
| 13 | typedef unsigned int seed_t; |
| 14 | |
| 15 | /* |
| 16 | * Get a seed from a reliable source of randomness without blocking. Returns 0 |
| 17 | * on success, -1 on failure. |
| 18 | */ |
| 19 | int lttng_produce_true_random_seed(seed_t *out_seed); |
| 20 | |
| 21 | /* |
| 22 | * Get a random seed making a best-effort to use a true randomness source, |
| 23 | * but falling back to a pseudo-random seed based on the time and various system |
| 24 | * configuration values on failure. Returns 0 on success, -1 on failure. |
| 25 | */ |
| 26 | int lttng_produce_best_effort_random_seed(seed_t *out_seed); |
| 27 | |
| 28 | #endif /* LTTNG_RANDOM_H */ |