/* Interfaces for obtaining random bytes.
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Copyright (C) 2016-2021 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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<https://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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#define GRND_INSECURE 0x04
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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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