| 0,0 → 1,65 |
|---|
| #ifndef _LINUX_ERR_H |
| #define _LINUX_ERR_H |
| |
| #include <linux/compiler.h> |
| |
| #include <errno.h> |
| |
| /* |
| * 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 |
| |
| #ifndef __ASSEMBLY__ |
| |
| #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) |
| |
| static inline void * __must_check ERR_PTR(long error) |
| { |
| return (void *) error; |
| } |
| |
| static inline long __must_check PTR_ERR(const void *ptr) |
| { |
| return (long) ptr; |
| } |
| |
| static inline long __must_check IS_ERR(const void *ptr) |
| { |
| return IS_ERR_VALUE((unsigned long)ptr); |
| } |
| |
| static inline long __must_check IS_ERR_OR_NULL(const void *ptr) |
| { |
| return !ptr || IS_ERR_VALUE((unsigned long)ptr); |
| } |
| |
| /** |
| * 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; |
| } |
| |
| static inline int __must_check PTR_RET(const void *ptr) |
| { |
| if (IS_ERR(ptr)) |
| return PTR_ERR(ptr); |
| else |
| return 0; |
| } |
| |
| #endif |
| |
| #endif /* _LINUX_ERR_H */ |