(libc.info.gz) Internet Address Formats

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(libc.info.gz) Internet Namespace

(libc.info.gz) Host Addresses

 
 16.6.1 Internet Socket Address Formats
 --------------------------------------
 
 In the Internet namespace, for both IPv4 (`AF_INET') and IPv6
 (`AF_INET6'), a socket address consists of a host address and a port on
 that host.  In addition, the protocol you choose serves effectively as
 a part of the address because local port numbers are meaningful only
 within a particular protocol.
 
    The data types for representing socket addresses in the Internet
 namespace are defined in the header file `netinet/in.h'.  
 
  -- Data Type: struct sockaddr_in
      This is the data type used to represent socket addresses in the
      Internet namespace.  It has the following members:
 
     `sa_family_t sin_family'
           This identifies the address family or format of the socket
           address.  You should store the value `AF_INET' in this member.
            Socket Addresses.
 
     `struct in_addr sin_addr'
           This is the Internet address of the host machine.   Host
           Addresses, and  Host Names, for how to get a value
           to store here.
 
     `unsigned short int sin_port'
           This is the port number.   Ports.
 
    When you call `bind' or `getsockname', you should specify `sizeof
 (struct sockaddr_in)' as the LENGTH parameter if you are using an IPv4
 Internet namespace socket address.
 
  -- Data Type: struct sockaddr_in6
      This is the data type used to represent socket addresses in the
      IPv6 namespace.  It has the following members:
 
     `sa_family_t sin6_family'
           This identifies the address family or format of the socket
           address.  You should store the value of `AF_INET6' in this
           member.   Socket Addresses.
 
     `struct in6_addr sin6_addr'
           This is the IPv6 address of the host machine.   Host
           Addresses, and  Host Names, for how to get a value
           to store here.
 
     `uint32_t sin6_flowinfo'
           This is a currently unimplemented field.
 
     `uint16_t sin6_port'
           This is the port number.   Ports.
 
 

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(libc.info.gz) Internet Namespace

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