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92dcaa3e | 1 | /* Interfaces for obtaining random bytes. |
2b778ceb | 2 | Copyright (C) 2016-2021 Free Software Foundation, Inc. |
92dcaa3e FW |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
92dcaa3e FW |
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 | |
319d2a7b | 28 | #define GRND_INSECURE 0x04 |
92dcaa3e FW |
29 | |
30 | __BEGIN_DECLS | |
31 | ||
32 | /* Write LENGTH bytes of randomness starting at BUFFER. Return the | |
33 | number of bytes written, or -1 on error. */ | |
34 | ssize_t getrandom (void *__buffer, size_t __length, | |
35 | unsigned int __flags) __wur; | |
36 | ||
37 | /* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on | |
38 | success or -1 on error. */ | |
39 | int getentropy (void *__buffer, size_t __length) __wur; | |
40 | ||
41 | __END_DECLS | |
42 | ||
43 | #endif /* _SYS_RANDOM_H */ |