0,0 → 1,65 |
#ifndef _LINUX_ERR_H |
#define _LINUX_ERR_H |
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#include <linux/compiler.h> |
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#include <errno.h> |
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/* |
* Kernel pointers have redundant information, so we can use a |
* scheme where we can return either an error code or a dentry |
* pointer with the same return value. |
* |
* This should be a per-architecture thing, to allow different |
* error and pointer decisions. |
*/ |
#define MAX_ERRNO 4095 |
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#ifndef __ASSEMBLY__ |
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#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) |
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static inline void * __must_check ERR_PTR(long error) |
{ |
return (void *) error; |
} |
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static inline long __must_check PTR_ERR(const void *ptr) |
{ |
return (long) ptr; |
} |
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static inline long __must_check IS_ERR(const void *ptr) |
{ |
return IS_ERR_VALUE((unsigned long)ptr); |
} |
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static inline long __must_check IS_ERR_OR_NULL(const void *ptr) |
{ |
return !ptr || IS_ERR_VALUE((unsigned long)ptr); |
} |
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/** |
* ERR_CAST - Explicitly cast an error-valued pointer to another pointer type |
* @ptr: The pointer to cast. |
* |
* Explicitly cast an error-valued pointer to another pointer type in such a |
* way as to make it clear that's what's going on. |
*/ |
static inline void * __must_check ERR_CAST(const void *ptr) |
{ |
/* cast away the const */ |
return (void *) ptr; |
} |
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static inline int __must_check PTR_RET(const void *ptr) |
{ |
if (IS_ERR(ptr)) |
return PTR_ERR(ptr); |
else |
return 0; |
} |
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#endif |
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#endif /* _LINUX_ERR_H */ |