err.h

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#include <linux/errno.h>
 
#define MAX_ERRNO               4095
 
#define IS_ERR_VALUE(__X)       ((unsigned long)(uintptr_t)(__X) >= (unsigned long)-MAX_ERRNO)
 
static inline void * ERR_PTR(long error)
{
    return (void *)(uintptr_t)error;
}
 
static inline long PTR_ERR(const void *ptr)
{
    return (long)(uintptr_t)ptr;
}
 
static inline bool IS_ERR(const void *ptr)
{
    return IS_ERR_VALUE(ptr);
}
 
static inline bool IS_ERR_OR_NULL(const void *ptr)
{
    return !ptr || IS_ERR_VALUE(ptr);
}
 
static inline void * ERR_CAST(const void *ptr)
{
    return (void *)ptr;
}
 
static inline int PTR_ERR_OR_ZERO(const void *ptr)
{
    if (IS_ERR(ptr)) {
        return PTR_ERR(ptr);
    } else {
        return 0;
    }
}