/* Interfaces for obtaining random bytes.

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Copyright (C) 2016-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library 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 GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _SYS_RANDOM_H

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#define _SYS_RANDOM_H 1

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#include <features.h>

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#include <sys/types.h>

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/* Flags for use with getrandom. */

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#define GRND_NONBLOCK 0x01

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#define GRND_RANDOM 0x02

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__BEGIN_DECLS

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/* Write LENGTH bytes of randomness starting at BUFFER. Return the

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number of bytes written, or -1 on error. */

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ssize_t getrandom (void *__buffer, size_t __length,

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unsigned int __flags) __wur;

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/* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on

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success or -1 on error. */

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int getentropy (void *__buffer, size_t __length) __wur;

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__END_DECLS

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#endif /* _SYS_RANDOM_H */

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