1*4d495c6eSApple OSS Distributions /* * Copyright (c) 2018 Apple Inc. All rights reserved. 2*4d495c6eSApple OSS Distributions * 3*4d495c6eSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 4*4d495c6eSApple OSS Distributions * 5*4d495c6eSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 6*4d495c6eSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 7*4d495c6eSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 8*4d495c6eSApple OSS Distributions * compliance with the License. The rights granted to you under the License 9*4d495c6eSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 10*4d495c6eSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 11*4d495c6eSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 12*4d495c6eSApple OSS Distributions * terms of an Apple operating system software license agreement. 13*4d495c6eSApple OSS Distributions * 14*4d495c6eSApple OSS Distributions * Please obtain a copy of the License at 15*4d495c6eSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 16*4d495c6eSApple OSS Distributions * 17*4d495c6eSApple OSS Distributions * The Original Code and all software distributed under the License are 18*4d495c6eSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 19*4d495c6eSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 20*4d495c6eSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 21*4d495c6eSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 22*4d495c6eSApple OSS Distributions * Please see the License for the specific language governing rights and 23*4d495c6eSApple OSS Distributions * limitations under the License. 24*4d495c6eSApple OSS Distributions * 25*4d495c6eSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 26*4d495c6eSApple OSS Distributions */ 27*4d495c6eSApple OSS Distributions 28*4d495c6eSApple OSS Distributions #ifndef _OS_PTRTOOLS_H 29*4d495c6eSApple OSS Distributions #define _OS_PTRTOOLS_H 30*4d495c6eSApple OSS Distributions 31*4d495c6eSApple OSS Distributions /* dereference unaligned pointer 'p' */ 32*4d495c6eSApple OSS Distributions #define os_unaligned_deref(p) ((__os_unaligned_type(p))(p))->val 33*4d495c6eSApple OSS Distributions 34*4d495c6eSApple OSS Distributions /* ensure the compiler emits at most one access to 'val' */ 35*4d495c6eSApple OSS Distributions #define os_access_once(val) (*((volatile __typeof__((val)) *)&(val))) 36*4d495c6eSApple OSS Distributions 37*4d495c6eSApple OSS Distributions #define __os_unaligned_type(p) struct { __typeof__(*(p)) val; } __attribute__((packed)) * 38*4d495c6eSApple OSS Distributions 39*4d495c6eSApple OSS Distributions #endif /* _OS_PTRTOOLS_H */ 40