err.h revision 271127 
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, 2014 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
30#ifndef	_LINUX_ERR_H_
31#define	_LINUX_ERR_H_
32
33#define MAX_ERRNO	4095
34
35#define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
36
37static inline void *
38ERR_PTR(long error)
39{
40	return (void *)error;
41}
42
43static inline long
44PTR_ERR(const void *ptr)
45{
46	return (long)ptr;
47}
48
49static inline long
50IS_ERR(const void *ptr)
51{
52	return IS_ERR_VALUE((unsigned long)ptr);
53}
54
55static inline void *
56ERR_CAST(void *ptr)
57{
58	return (void *)ptr;
59}
60
61static inline int
62PTR_ERR_OR_ZERO(const void *ptr)
63{
64        if (IS_ERR(ptr))
65                return PTR_ERR(ptr);
66        else
67                return 0;
68}
69
70#define PTR_RET(p) PTR_ERR_OR_ZERO(p)
71
72#endif	/* _LINUX_ERR_H_ */
73