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at line 176 connect ERROR: con_rtn = -1, errno = 22 Invalid argument
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/*
*function    : TCP communication with a forked subtask
  struct sockaddr_un
    {
      sa_family_t sun_family; // PF_NUIX or AF_UNIX or AF_LOCAL
      char sun_path[UNIX_PATH_MAX];  //name of path;
    };
  //usr/include/linux/socket.h
  typedef unsigned short sa_family_t;
  struct sockaddr            //this is general structure;
    {
      unsigned short sa_family; //AF_xxx
      char sa_data[14];        // 14 bytes of protocol address
    };
  //usr/include/netinet/in.h
  struct sockaddr_in        //internet socket, can convert between above and it;
    {
      short int sin_family;    //address cluster
      unsigned short int sin_port; //port number
      struct in_addr;        //ip address
      unsigned char sin_zero[8]; //for the same size as struct sockaddr
    };
  struct in_addr
    {