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/**
* (C) 2007-22 - ntop.org and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not see see <http://www.gnu.org/licenses/>
*
*/
#ifndef RND_H
#define RND_H
#include <stdint.h>
#include <stddef.h>
#include <time.h> /* time, clock */
#include "n2n.h" /* traceEvent */
// syscall and inquiring random number from hardware generators might fail, so we will retry
#define RND_RETRIES 1000
#if defined (__linux__)
#include <sys/syscall.h> /* syscall, SYS_getrandom */
#ifdef SYS_getrandom
#define GRND_NONBLOCK 1
#include <errno.h> /* errno, EAGAIN */
#endif
#endif
#if defined (__RDRND__) || defined (__RDSEED__)
#include <immintrin.h> /* _rdrand64_step, rdseed4_step */
#endif
#if defined (WIN32)
#include <wincrypt.h> // HCTYPTPROV, Crypt*-functions
#endif
typedef struct rn_generator_state_t {
uint64_t a, b;
} rn_generator_state_t;
typedef struct splitmix64_state_t {
uint64_t s;
} splitmix64_state_t;
int n2n_srand (uint64_t seed);
uint64_t n2n_rand (void);
uint64_t n2n_seed (void);
uint32_t n2n_rand_sqr (uint32_t max_n);
#endif // RND_H
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