/*
* Copyright ( C ) 2017 The Android Open Source Project
* All rights reserved .
*
* Redistribution and use in source and binary forms , with or without
* modification , are permitted provided that the following conditions
* are met :
* * Redistributions of source code must retain the above copyright
* notice , this list of conditions and the following disclaimer .
* * Redistributions in binary form must reproduce the above copyright
* notice , this list of conditions and the following disclaimer in
* the documentation and / or other materials provided with the
* distribution .
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* " AS IS " AND ANY EXPRESS OR IMPLIED WARRANTIES , INCLUDING , BUT NOT
* LIMITED TO , THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED . IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT , INDIRECT ,
* INCIDENTAL , SPECIAL , EXEMPLARY , OR CONSEQUENTIAL DAMAGES ( INCLUDING ,
* BUT NOT LIMITED TO , PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES ; LOSS
* OF USE , DATA , OR PROFITS ; OR BUSINESS INTERRUPTION ) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY , WHETHER IN CONTRACT , STRICT LIABILITY ,
* OR TORT ( INCLUDING NEGLIGENCE OR OTHERWISE ) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE , EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE .
*/
#pragma once
/**
* @ file sys / random . h
* @ brief The getentropy ( ) and getrandom ( ) functions .
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <linux/random.h>
#include <bits/getentropy.h>
__BEGIN_DECLS
#if __BIONIC_AVAILABILITY_GUARD(28 )
/**
* [ getrandom ( 2 ) ] ( https : //man7.org/linux/man-pages/man2/getrandom.2.html) fills the given buffer
* with random bytes .
*
* Returns the number of bytes copied on success , and returns - 1 and sets ` errno ` on failure .
*
* Available since API level 28 .
*
* See also arc4random_buf ( ) which is available in all API levels .
*/
__nodiscard ssize_t getrandom(void * _Nonnull __buffer, size_t __buffer_size, unsigned int __flags) __INTRODUCED_IN(28 );
#endif
__END_DECLS
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