err.h revision 331756 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2016 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: stable/11/sys/compat/linuxkpi/common/include/linux/err.h 331756 2018-03-30 02:04:46Z emaste $
30 */
31#ifndef	_LINUX_ERR_H_
32#define	_LINUX_ERR_H_
33
34#include <linux/compiler.h>
35
36#define MAX_ERRNO	4095
37
38#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
39
40static inline void *
41ERR_PTR(long error)
42{
43	return (void *)error;
44}
45
46static inline long
47PTR_ERR(const void *ptr)
48{
49	return (long)ptr;
50}
51
52static inline long
53IS_ERR(const void *ptr)
54{
55	return IS_ERR_VALUE((unsigned long)ptr);
56}
57
58static inline long
59IS_ERR_OR_NULL(const void *ptr)
60{
61	return !ptr || IS_ERR_VALUE((unsigned long)ptr);
62}
63
64static inline void *
65ERR_CAST(void *ptr)
66{
67	return (void *)ptr;
68}
69
70static inline int
71PTR_ERR_OR_ZERO(const void *ptr)
72{
73	if (IS_ERR(ptr))
74		return PTR_ERR(ptr);
75	else
76		return 0;
77}
78
79#define PTR_RET(p) PTR_ERR_OR_ZERO(p)
80
81#endif	/* _LINUX_ERR_H_ */
82