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1 | #ifndef _LINUX_ERR_H |
2 | #define _LINUX_ERR_H |
3 | |
4 | #include <linux/compiler.h> |
5 | |
6 | #include <asm/errno.h> |
7 | |
8 | /* |
9 | * Kernel pointers have redundant information, so we can use a |
10 | * scheme where we can return either an error code or a dentry |
11 | * pointer with the same return value. |
12 | * |
13 | * This should be a per-architecture thing, to allow different |
14 | * error and pointer decisions. |
15 | */ |
16 | #define MAX_ERRNO 4095 |
17 | |
18 | #ifndef __ASSEMBLY__ |
19 | |
20 | #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) |
21 | |
22 | static inline void *ERR_PTR(long error) |
23 | { |
24 | return (void *) error; |
25 | } |
26 | |
27 | static inline long PTR_ERR(const void *ptr) |
28 | { |
29 | return (long) ptr; |
30 | } |
31 | |
32 | static inline long IS_ERR(const void *ptr) |
33 | { |
34 | return IS_ERR_VALUE((unsigned long)ptr); |
35 | } |
36 | |
37 | static inline long IS_ERR_OR_NULL(const void *ptr) |
38 | { |
39 | return !ptr || IS_ERR_VALUE((unsigned long)ptr); |
40 | } |
41 | |
42 | /** |
43 | * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type |
44 | * @ptr: The pointer to cast. |
45 | * |
46 | * Explicitly cast an error-valued pointer to another pointer type in such a |
47 | * way as to make it clear that's what's going on. |
48 | */ |
49 | static inline void *ERR_CAST(const void *ptr) |
50 | { |
51 | /* cast away the const */ |
52 | return (void *) ptr; |
53 | } |
54 | |
55 | #endif |
56 | |
57 | #endif /* _LINUX_ERR_H */ |
58 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9