1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #pragma once 30 31 /** 32 * @file sys/random.h 33 * @brief The getentropy() and getrandom() functions. 34 */ 35 36 #include <sys/cdefs.h> 37 #include <sys/types.h> 38 39 #include <linux/random.h> 40 41 __BEGIN_DECLS 42 43 /** 44 * [getentropy(3)](http://man7.org/linux/man-pages/man3/getentropy.3.html) fills the given buffer 45 * with random bytes. 46 * 47 * Returns 0 on success, and returns -1 and sets `errno` on failure. 48 * 49 * Available since API level 28. 50 * 51 * See also arc4random_buf() which is available in all API levels. 52 */ 53 int getentropy(void* __buffer, size_t __buffer_size) __wur __INTRODUCED_IN(28); 54 55 /** 56 * [getrandom(2)](http://man7.org/linux/man-pages/man2/getrandom.2.html) fills the given buffer 57 * with random bytes. 58 * 59 * Returns the number of bytes copied on success, and returns -1 and sets `errno` on failure. 60 * 61 * Available since API level 28. 62 * 63 * See also arc4random_buf() which is available in all API levels. 64 */ 65 ssize_t getrandom(void* __buffer, size_t __buffer_size, unsigned int __flags) __wur __INTRODUCED_IN(28); 66 67 __END_DECLS 68