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    #include <sys/types.h>
    #include <sysy/socket.h>
   
    int socketpair( int domain , int type , int protocol , int sv[2] );
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    #include <sys/socket.h>
   
    struct sockaddr{
        sa_family_t sa_family ;         /* µØÖ·×å */
        char  sa_data[14] ;               /* µØÖ·Êý¾Ý */
    };
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