/* 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 */