1*a1e26a70SApple OSS Distributions /* * Copyright (c) 2018 Apple Inc. All rights reserved. 2*a1e26a70SApple OSS Distributions * 3*a1e26a70SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 4*a1e26a70SApple OSS Distributions * 5*a1e26a70SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 6*a1e26a70SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 7*a1e26a70SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 8*a1e26a70SApple OSS Distributions * compliance with the License. The rights granted to you under the License 9*a1e26a70SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 10*a1e26a70SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 11*a1e26a70SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 12*a1e26a70SApple OSS Distributions * terms of an Apple operating system software license agreement. 13*a1e26a70SApple OSS Distributions * 14*a1e26a70SApple OSS Distributions * Please obtain a copy of the License at 15*a1e26a70SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 16*a1e26a70SApple OSS Distributions * 17*a1e26a70SApple OSS Distributions * The Original Code and all software distributed under the License are 18*a1e26a70SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 19*a1e26a70SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 20*a1e26a70SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 21*a1e26a70SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 22*a1e26a70SApple OSS Distributions * Please see the License for the specific language governing rights and 23*a1e26a70SApple OSS Distributions * limitations under the License. 24*a1e26a70SApple OSS Distributions * 25*a1e26a70SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 26*a1e26a70SApple OSS Distributions */ 27*a1e26a70SApple OSS Distributions 28*a1e26a70SApple OSS Distributions #ifndef _OS_PTRTOOLS_H 29*a1e26a70SApple OSS Distributions #define _OS_PTRTOOLS_H 30*a1e26a70SApple OSS Distributions 31*a1e26a70SApple OSS Distributions /* dereference unaligned pointer 'p' */ 32*a1e26a70SApple OSS Distributions #define os_unaligned_deref(p) ((__os_unaligned_type(p))(p))->val 33*a1e26a70SApple OSS Distributions 34*a1e26a70SApple OSS Distributions /* ensure the compiler emits at most one access to 'val' */ 35*a1e26a70SApple OSS Distributions #define os_access_once(val) (*((volatile __typeof__((val)) *)&(val))) 36*a1e26a70SApple OSS Distributions 37*a1e26a70SApple OSS Distributions #define __os_unaligned_type(p) struct { __typeof__(*(p)) val; } __attribute__((packed)) * 38*a1e26a70SApple OSS Distributions 39*a1e26a70SApple OSS Distributions #endif /* _OS_PTRTOOLS_H */ 40