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/* Interfaces for obtaining random bytes.
Copyright (C) 2016-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _SYS_RANDOM_H
#define _SYS_RANDOM_H 1
#include <features.h>
#include <sys/types.h>
/* Flags for use with getrandom. */
#define GRND_NONBLOCK 0x01
#define GRND_RANDOM 0x02
#define GRND_INSECURE 0x04
__BEGIN_DECLS
/* Write LENGTH bytes of randomness starting at BUFFER. Return the
number of bytes written, or -1 on error. */
ssize_t getrandom (void *__buffer, size_t __length,
unsigned int __flags) __wur
__attr_access ((__write_only__, 1, 2));
/* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on
success or -1 on error. */
int getentropy (void *__buffer, size_t __length) __wur
__attr_access ((__write_only__, 1, 2));
__END_DECLS
#endif /* _SYS_RANDOM_H */
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