| 1 | /* $NetBSD: err.h,v 1.1 2015/08/18 21:10:56 skrll 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 ELAST |
| 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_RET(const void *ptr) |
| 83 | { |
| 84 | return (IS_ERR(ptr)? PTR_ERR(ptr) : 0); |
| 85 | } |
| 86 | |
| 87 | #endif /* _LINUX_ERR_H_ */ |
| 88 | |