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Linux/include/linux/err.h

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  1 #ifndef _LINUX_ERR_H
  2 #define _LINUX_ERR_H
  3 
  4 #include <linux/compiler.h>
  5 #include <linux/types.h>
  6 
  7 #include <asm/errno.h>
  8 
  9 /*
 10  * Kernel pointers have redundant information, so we can use a
 11  * scheme where we can return either an error code or a normal
 12  * pointer with the same return value.
 13  *
 14  * This should be a per-architecture thing, to allow different
 15  * error and pointer decisions.
 16  */
 17 #define MAX_ERRNO       4095
 18 
 19 #ifndef __ASSEMBLY__
 20 
 21 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
 22 
 23 static inline void * __must_check ERR_PTR(long error)
 24 {
 25         return (void *) error;
 26 }
 27 
 28 static inline long __must_check PTR_ERR(__force const void *ptr)
 29 {
 30         return (long) ptr;
 31 }
 32 
 33 static inline bool __must_check IS_ERR(__force const void *ptr)
 34 {
 35         return IS_ERR_VALUE((unsigned long)ptr);
 36 }
 37 
 38 static inline bool __must_check IS_ERR_OR_NULL(__force const void *ptr)
 39 {
 40         return !ptr || IS_ERR_VALUE((unsigned long)ptr);
 41 }
 42 
 43 /**
 44  * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
 45  * @ptr: The pointer to cast.
 46  *
 47  * Explicitly cast an error-valued pointer to another pointer type in such a
 48  * way as to make it clear that's what's going on.
 49  */
 50 static inline void * __must_check ERR_CAST(__force const void *ptr)
 51 {
 52         /* cast away the const */
 53         return (void *) ptr;
 54 }
 55 
 56 static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
 57 {
 58         if (IS_ERR(ptr))
 59                 return PTR_ERR(ptr);
 60         else
 61                 return 0;
 62 }
 63 
 64 /* Deprecated */
 65 #define PTR_RET(p) PTR_ERR_OR_ZERO(p)
 66 
 67 #endif
 68 
 69 #endif /* _LINUX_ERR_H */
 70 

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