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TOMOYO Linux Cross Reference
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 
  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 * __must_check ERR_PTR(long error)
 23 {
 24         return (void *) error;
 25 }
 26 
 27 static inline long __must_check PTR_ERR(const void *ptr)
 28 {
 29         return (long) ptr;
 30 }
 31 
 32 static inline long __must_check IS_ERR(const void *ptr)
 33 {
 34         return IS_ERR_VALUE((unsigned long)ptr);
 35 }
 36 
 37 static inline long __must_check 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 * __must_check ERR_CAST(const void *ptr)
 50 {
 51         /* cast away the const */
 52         return (void *) ptr;
 53 }
 54 
 55 static inline int __must_check PTR_RET(const void *ptr)
 56 {
 57         if (IS_ERR(ptr))
 58                 return PTR_ERR(ptr);
 59         else
 60                 return 0;
 61 }
 62 
 63 #endif
 64 
 65 #endif /* _LINUX_ERR_H */
 66 

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