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
IS_ERR_VALUE(uintptr_t n)44 IS_ERR_VALUE(uintptr_t n)
45 {
46 return (n >= (uintptr_t)-MAX_ERRNO);
47 }
48
49 static inline void *
ERR_PTR(long error)50 ERR_PTR(long error)
51 {
52 KASSERT(error < 0);
53 return (void *)(intptr_t)error;
54 }
55
56 static inline long
PTR_ERR(const void * ptr)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
IS_ERR(const void * ptr)64 IS_ERR(const void *ptr)
65 {
66 return IS_ERR_VALUE((uintptr_t)ptr);
67 }
68
69 static inline bool
IS_ERR_OR_NULL(const void * ptr)70 IS_ERR_OR_NULL(const void *ptr)
71 {
72 return ((ptr == NULL) || IS_ERR(ptr));
73 }
74
75 static inline void *
ERR_CAST(void * ptr)76 ERR_CAST(void *ptr) /* XXX Linux declares with const. */
77 {
78 return ptr;
79 }
80
81 static inline long
PTR_ERR_OR_ZERO(const void * ptr)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