| 1 | /* Interfaces for obtaining random bytes. |
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| 2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _SYS_RANDOM_H |
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| 20 | #define _SYS_RANDOM_H 1 |
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| 21 | |
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| 22 | #include <features.h> |
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| 23 | #include <sys/types.h> |
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| 24 | |
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| 25 | /* Flags for use with getrandom. */ |
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| 26 | #define GRND_NONBLOCK 0x01 |
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| 27 | #define GRND_RANDOM 0x02 |
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| 28 | #define GRND_INSECURE 0x04 |
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| 29 | |
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| 30 | __BEGIN_DECLS |
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| 31 | |
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| 32 | /* Write LENGTH bytes of randomness starting at BUFFER. Return the |
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| 33 | number of bytes written, or -1 on error. */ |
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| 34 | ssize_t getrandom (void *__buffer, size_t __length, |
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| 35 | unsigned int __flags) __wur; |
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| 36 | |
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| 37 | /* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on |
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| 38 | success or -1 on error. */ |
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| 39 | int getentropy (void *__buffer, size_t __length) __wur; |
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| 40 | |
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| 41 | __END_DECLS |
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| 42 | |
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| 43 | #endif /* _SYS_RANDOM_H */ |
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| 44 | |
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