1 #ifndef _ASM_GENERIC_ERRNO_BASE_H
 2 #define _ASM_GENERIC_ERRNO_BASE_H
 3
 4 #define    EPERM         1    /* Operation not permitted */
 5 #define    ENOENT         2    /* No such file or directory */
 6 #define    ESRCH         3    /* No such process */
 7 ......
 8 ......
 9 ......
10 #define    EDOM        33    /* Math argument out of domain of func */
11 #define    ERANGE        34    /* Math result not representable */
12
13 #endif

 1 #define _ASM_GENERIC_ERRNO_H
 2
 3 #include <asm-generic/errno-base.h>
 4
 5 #define EDEADLK         35      /* Resource deadlock would occur */
 6 #define ENAMETOOLONG    36      /* File name too long */
 7 #define ENOLCK          37      /* No record locks available */
 8 ......
 9 ......
10 ......
11 #define ERFKILL         132     /* Operation not possible due to RF-kill */
12
13 #define EHWPOISON       133     /* Memory page has hardware error */
14
15 #endif

 1 #define MAX_ERRNO    4095
 2
 3 #ifndef __ASSEMBLY__
 4 EPERM
 5 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
 6 ERROR
 7 static inline void * __must_check ERR_PTR(long error)        //把错误转化指针
 8 {
 9     return (void *) error;
10 }
11
12 static inline long __must_check PTR_ERR(const void *ptr)            //把指针转化错误
13 {
14     return (long) ptr;
15 }
16
17 static inline long __must_check IS_ERR(const void *ptr)        //判断是否错误指针
18 {
19     return IS_ERR_VALUE((unsigned long)ptr);
20 }
21
22 static inline long __must_check IS_ERR_OR_NULL(const void *ptr)        //判断空指针或者错误指针
23 {
24     return !ptr || IS_ERR_VALUE((unsigned long)ptr);
25 }