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
43static inline bool
44IS_ERR_VALUE(uintptr_t n)
45{
46 return (n >= (uintptr_t)-MAX_ERRNO);
47}
48
49static inline void *
50ERR_PTR(long error)
51{
52 KASSERT(error < 0);
53 return (void *)(intptr_t)error;
54}
55
56static inline long
57PTR_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
63static inline bool
64IS_ERR(const void *ptr)
65{
66 return IS_ERR_VALUE((uintptr_t)ptr);
67}
68
69static inline bool
70IS_ERR_OR_NULL(const void *ptr)
71{
72 return ((ptr == NULL) || IS_ERR(ptr));
73}
74
75static inline void *
76ERR_CAST(void *ptr) /* XXX Linux declares with const. */
77{
78 return ptr;
79}
80
81static inline long
82PTR_RET(const void *ptr)
83{
84 return (IS_ERR(ptr)? PTR_ERR(ptr) : 0);
85}
86
87#endif /* _LINUX_ERR_H_ */
88