.TH ISO 4F "9 December 1988".ds ]W Wisconsin ARGO 1.0.UC  4.SH NAMEiso \- ISO protocol family.SH SYNOPSIS.B #include <sys/types.h>.br.B #include <netargo/iso.h>.SH DESCRIPTIONThe ISO protocol family is a collection of protocolsthat uses the ISO address format.The ISO family provides protocol support for theSOCK_SEQPACKET abstraction through the TP protocol (ISO 8073), and for the SOCK_RAW abstractionby providing direct access (for debugging) to theCLNP (ISO 8473) network layer protocol..SH ADDRESSINGISO addresses are based upon ISO 8348/AD2, "Addendum to the Network Service Definition Covering Network Layer Addressing.".PPSockets bound to the OSI protocol family usethe following address structure:.sp 1.nf._fstruct sockaddr_iso {	short	siso_family;	u_short	siso_tsuffix;	struct	iso_addr siso_addr;};.sp 1.fi.PPThis fields of this structure are:.TP 10\fIsiso_family:\fRIdentifies the domain: AF_ISO or AF_INET..TP 10\fIsiso_tsuffix:\fRThe transport part of the address, described below..TP 10\fIsiso_addr:\fRThe network part of the address, described below..SS TRANSPORT ADDRESSING.PPThe above structure describes a simple form of ISO \fItransport\fR addresses.An ISO transport address is similar to an Internet address in thatit contains a network-address portion and a portion that thetransport layer uses to multiplex its services among clients.In the Internet domain, this portion of the address is called a \fIport\fR.In the ISO domain, this is called a \fItransport selector\fR(also known at one time as a \fItransport suffix\fR).While ports are always 16 bits, transport selectors may beof (almost) arbitrary size.ARGO supports two forms of transport selectors:"normal" or 16-bit selectors, and"extended" selectors, or selectors that may be from 1-64 bytesin length.The default mode of operation is to use 16-bit transport selectors.These addresses can be represented with the above structure.When transport selectors of any other size are used, the transportselector is kept in a separate structure.See the manual page \fItp(4p)\fR..SS NETWORK ADDRESSING.PPISO network addresses are limited to 20 bytes in length.ISO network addresses can take any format.ARGO 1.0 supports three formats.See \fIisodir(3)\fR and \fIisodir(5)\fR..SH PROTOCOLSThe ARGO 1.0 implementation of the ISO protocol family comprisesthe Connectionless-Mode Network Protocol (CLNP), and the Transport Protocol (TP), classes 4 and 0,and X.25.TP is used to support the SOCK_SEQPACKETabstraction.A raw interface to CLNP is availableby creating an ISO socket of type SOCK_RAW.This is used for CLNP debugging only..SH SEE ALSOtp(4P), cons(4p), clnp(4P), isodir(3), iso(4f), isodir(5),"The ARGO 1.0 Kernel Programmer's Guide","Installing ARGO 1.0 on Academic Operating Systems 4.3 Release 2"