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473b89c963
Most environments have predefined macros that identify the environment
to the source code. If we use these macros instead of defining our own
then there is one less parameter difference to keep track of with
different builds
cf:
http://web.archive.org/web/20191012035921/http://nadeausoftware.com/articles/2012/01/c_c_tip_how_use_compiler_predefined_macros_detect_operating_system
https://sourceforge.net/p/predef/wiki/OperatingSystems/
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/**
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* (C) 2007-22 - ntop.org and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not see see <http://www.gnu.org/licenses/>
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*
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*/
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#ifndef RND_H
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#define RND_H
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#include <stdint.h> // for uint64_t, uint32_t
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// syscall and inquiring random number from hardware generators might fail, so we will retry
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#define RND_RETRIES 1000
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#if defined (__linux__)
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#include <syscall.h> // for SYS_getrandom
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#ifdef SYS_getrandom
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#define GRND_NONBLOCK 1
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#endif
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#endif
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#if defined (__RDRND__) || defined (__RDSEED__)
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#include <immintrin.h> /* _rdrand64_step, rdseed4_step */
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#endif
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#ifdef _WIN32
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#include <wincrypt.h> // HCTYPTPROV, Crypt*-functions
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#endif
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typedef struct rn_generator_state_t {
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uint64_t a, b;
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} rn_generator_state_t;
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typedef struct splitmix64_state_t {
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uint64_t s;
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} splitmix64_state_t;
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int n2n_srand (uint64_t seed);
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uint64_t n2n_rand (void);
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uint64_t n2n_seed (void);
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uint32_t n2n_rand_sqr (uint32_t max_n);
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#endif // RND_H
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