20.1 Types, Constants and variables :

The following constants identify the different socket types, as needed in the Socket (671) 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 (671) 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 (671) 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 (662), Recv (668) and Send (669) 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 (672) call.

 TSockArray = Array[1..2] of Longint;

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