Types, Constants and variables :

The following constants identify the different socket types, as needed in the Socket call.

SOCK_STREAM     = 1; { stream (connection) socket   }
SOCK_DGRAM      = 2; { datagram (conn.less) socket  }
SOCK_RAW        = 3; { raw socket                   }
SOCK_RDM        = 4; { reliably-delivered message   }
SOCK_SEQPACKET  = 5; { sequential packet socket     }
SOCK_PACKET     =10;

The following constants determine the socket domain, they are used in the Socket call.

AF_UNSPEC       = 0;
AF_UNIX         = 1; { Unix domain sockets          }
AF_INET         = 2; { Internet IP Protocol         }
AF_AX25         = 3; { Amateur Radio AX.25          }
AF_IPX          = 4; { Novell IPX                   }
AF_APPLETALK    = 5; { Appletalk DDP                }
AF_NETROM       = 6; { Amateur radio NetROM         }
AF_BRIDGE       = 7; { Multiprotocol bridge         }
AF_AAL5         = 8; { Reserved for Werner's ATM    }
AF_X25          = 9; { Reserved for X.25 project    }
AF_INET6        = 10; { IP version 6                 }
AF_MAX          = 12;

The following constants determine the protocol family, they are used in the Socket call.

 
PF_UNSPEC       = AF_UNSPEC;
PF_UNIX         = AF_UNIX;
PF_INET         = AF_INET;
PF_AX25         = AF_AX25;
PF_IPX          = AF_IPX;
PF_APPLETALK    = AF_APPLETALK;
PF_NETROM       = AF_NETROM;
PF_BRIDGE       = AF_BRIDGE;
PF_AAL5         = AF_AAL5;
PF_X25          = AF_X25;
PF_INET6        = AF_INET6;
PF_MAX          = AF_MAX;

The following types are used to store different kinds of eddresses for the Bind, Recv and Send calls.

  
TSockAddr = packed Record
  family:word;
  data  :array [0..13] of char;
  end;

TUnixSockAddr = packed Record
  family:word;
  path:array[0..108] of char;
  end;

TInetSockAddr = packed Record
  family:Word;
  port  :Word;
  addr  :Cardinal;
  pad   :array [1..8] of byte; 
  end;

The following type is returned by the SocketPair call.

TSockArray = Array[1..2] of Longint;