1/* Interfaces for obtaining random bytes.
 2   Copyright (C) 2016-2025 Free Software Foundation, Inc.
 3   This file is part of the GNU C Library.
 4
 5   The GNU C Library is free software; you can redistribute it and/or
 6   modify it under the terms of the GNU Lesser General Public
 7   License as published by the Free Software Foundation; either
 8   version 2.1 of the License, or (at your option) any later version.
 9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#ifndef _SYS_RANDOM_H
20#define _SYS_RANDOM_H 1
21
22#include <features.h>
23#include <sys/types.h>
24
25/* Flags for use with getrandom.  */
26#define GRND_NONBLOCK 0x01
27#define GRND_RANDOM 0x02
28#define GRND_INSECURE 0x04
29
30__BEGIN_DECLS
31
32// zig patch: getrandom and getentropy were added in glibc 2.25
33#if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25) || __GLIBC__ > 2
34
35/* Write LENGTH bytes of randomness starting at BUFFER.  Return the
36   number of bytes written, or -1 on error.  */
37ssize_t getrandom (void *__buffer, size_t __length,
38                   unsigned int __flags) __wur
39                   __attr_access ((__write_only__, 1, 2));
40
41/* Write LENGTH bytes of randomness starting at BUFFER.  Return 0 on
42   success or -1 on error.  */
43int getentropy (void *__buffer, size_t __length) __wur
44                __attr_access ((__write_only__, 1, 2));
45
46#endif /* glibc 2.25 or later */
47
48__END_DECLS
49
50#endif /* _SYS_RANDOM_H */