1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
13 * disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31 #ifndef _LINUX_ERR_H_
32 #define _LINUX_ERR_H_
33
34 #define MAX_ERRNO 4095
35
36 #define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
37
38 static inline void *
ERR_PTR(long error)39 ERR_PTR(long error)
40 {
41 return (void *)error;
42 }
43
44 static inline long
PTR_ERR(const void * ptr)45 PTR_ERR(const void *ptr)
46 {
47 return (long)ptr;
48 }
49
50 static inline long
IS_ERR(const void * ptr)51 IS_ERR(const void *ptr)
52 {
53 return IS_ERR_VALUE((unsigned long)ptr);
54 }
55
56 static inline long
IS_ERR_OR_NULL(const void * ptr)57 IS_ERR_OR_NULL(const void *ptr)
58 {
59 return !ptr || IS_ERR_VALUE((unsigned long)ptr);
60 }
61
62 static inline void *
ERR_CAST(void * ptr)63 ERR_CAST(void *ptr)
64 {
65 return (void *)ptr;
66 }
67
68 static inline int
PTR_ERR_OR_ZERO(const void * ptr)69 PTR_ERR_OR_ZERO(const void *ptr)
70 {
71 if (IS_ERR(ptr))
72 return PTR_ERR(ptr);
73 else
74 return 0;
75 }
76
77 #define PTR_RET(p) PTR_ERR_OR_ZERO(p)
78
79 #endif /* _LINUX_ERR_H_ */
80