LCOV - code coverage report
Current view: top level - lkbce/include/linux - err.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 1 100.0 %
Date: 2017-01-25 Functions: 1 1 100.0 %

          Line data    Source code
       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           3 : 
      57             : #endif /* _LINUX_ERR_H */

Generated by: LCOV version 1.10