1 /* $NetBSD: err.h,v 1.3 2019/04/16 10:00:04 mrg Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _LINUX_ERR_H_ 33 #define _LINUX_ERR_H_ 34 35 /* XXX Linux uses long and int inconsistently here. Hope this works out. */ 36 37 #include <sys/types.h> 38 #include <sys/errno.h> 39 #include <sys/systm.h> 40 41 #define MAX_ERRNO 4095 42 43 static inline bool 44 IS_ERR_VALUE(uintptr_t n) 45 { 46 return (n >= (uintptr_t)-MAX_ERRNO); 47 } 48 49 static inline void * 50 ERR_PTR(long error) 51 { 52 KASSERT(error < 0); 53 return (void *)(intptr_t)error; 54 } 55 56 static inline long 57 PTR_ERR(const void *ptr) 58 { 59 KASSERT(ptr == (void *)(intptr_t)(long)(intptr_t)ptr); /* XXX Hurk! */ 60 return (long)(intptr_t)ptr; 61 } 62 63 static inline bool 64 IS_ERR(const void *ptr) 65 { 66 return IS_ERR_VALUE((uintptr_t)ptr); 67 } 68 69 static inline bool 70 IS_ERR_OR_NULL(const void *ptr) 71 { 72 return ((ptr == NULL) || IS_ERR(ptr)); 73 } 74 75 static inline void * 76 ERR_CAST(void *ptr) /* XXX Linux declares with const. */ 77 { 78 return ptr; 79 } 80 81 static inline long 82 PTR_ERR_OR_ZERO(const void *ptr) 83 { 84 return (IS_ERR(ptr)? PTR_ERR(ptr) : 0); 85 } 86 87 #define PTR_RET PTR_ERR_OR_ZERO 88 89 #endif /* _LINUX_ERR_H_ */ 90