2 * Copyright (C) 2023 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * SPDX-License-Identifier: LGPL-2.1-only
11 #include "exception.hpp"
19 using seed_t = unsigned int;
21 class production_error : public ::lttng::runtime_error {
23 explicit production_error(const std::string& msg,
24 const char *file_name,
25 const char *function_name,
26 unsigned int line_number);
30 * Get a seed from a reliable source of randomness without blocking, raising
31 * an exception on failure.
33 seed_t produce_true_random_seed();
36 * Get a random seed making a best-effort to use a true randomness source,
37 * but falling back to a pseudo-random seed based on the time and various system
38 * configuration values on failure.
40 * Note that this function attempts to use the urandom device, which will block
41 * in the unlikely event that its pool is uninitialized, on platforms that don't
42 * provide getrandom().
44 seed_t produce_best_effort_random_seed();
46 } /* namespace random */
47 } /* namespace lttng */
49 #endif /* LTTNG_RANDOM_H */