/* Interfaces for obtaining random bytes.
Copyright (C) 2016-2018 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
<http://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

__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;

/* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on
success or -1 on error. */
int getentropy (void *__buffer, size_t __length) __wur;

__END_DECLS

#endif /* _SYS_RANDOM_H */