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参考

/* There is some amount of overlap with 
   
     as known by inet code */  #ifndef __int8_t_defined  # define __int8_t_defined  typedef signed char             int8_t;   typedef short int               int16_t;  typedef int                     int32_t;  # if __WORDSIZE == 64  typedef long int                int64_t;  # else  __extension__  typedef long long int           int64_t;  # endif  #endif    /* Unsigned.  */  typedef unsigned char           uint8_t;  typedef unsigned short int      uint16_t;  #ifndef __uint32_t_defined  typedef unsigned int            uint32_t;  # define __uint32_t_defined  #endif  #if __WORDSIZE == 64  typedef unsigned long int       uint64_t;  #else  __extension__  typedef unsigned long long int  uint64_t;  #endif
   

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