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Transport Layer Interface

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In computer networking, the Transport Layer Interface (TLI) was the networking API provided by AT&T UNIX System V Release 3 (SVR3) in 1987[1] and continued into Release 4 (SVR4).[2] TLI was the System V counterpart to the BSD sockets programming interface, which was also provided in UNIX System V Release 4 (SVR4).[3] TLI was later standardized as XTI, the X/Open Transport Interface.

TLI and Sockets

It was originally expected that the OSI protocols would supersede TCP/IP, thus TLI is designed from an OSI model-oriented viewpoint, corresponding to the OSI transport layer. Otherwise, TLI looks similar, API-wise, to sockets.

TLI and XTI were widely used and, up to UNIX 98, were preferred over the POSIX Sockets API.[4] TLI and XTI are still supported in SVR4-derived operating systems and operating systems conforming to branded UNIX (UNIX 95, UNIX 98 and UNIX 03 Single UNIX Specifications) such as Solaris (as well as "classic" Mac OS, in the form of Open Transport). Under UNIX 95 (XPG4) and UNIX 98 (XPG5.2), XTI was the preferred and recommended supported API for new transport protocols.[5][6] As a result of deliberations by the Austin Group with the goal of bringing flavors of UNIX that do not provide STREAMS, such as BSD and Linux, under the Single UNIX Specification, the UNIX 03 Single UNIX Specification both declares STREAMS as optional, and declares POSIX Sockets as the preferred API for new tranport protocols.

See also

Notes

  1. ^ (Goodheart 1994, p. 11)
  2. ^ (Goodheart 1994, p. 17)
  3. ^ (Goodheart 1994, p. 17)
  4. ^ (XNS & 5.2)
  5. ^ (XNS & 5)
  6. ^ (XNS & 5.2)

References

  • Goodheart, Berny (1994). The magic garden explained: the internals of UNIX® System V Release 4, an open-systems design. Australia: Prentice Hall. ISBN 0-13-098138-9. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)CS1 maint: ref duplicates default (link)
  • Open Group (February 1997), Networking Services (XNS) Issue 5, CAE Specification, vol. XNS (5th ed.), Berkshire, U.K.: The Open Group, ISBN 1-85912-165-9
  • Open Group (January 2000), Networking Services (XNS) Issue 5.2, CAE Specification, vol. XNS (5.2th ed.), Berkshire, U.K.: The Open Group
  • Pajari, George (1992) [1991]. Writing UNIX® Device Drivers (2nd Printing ed.). Reading, MA: Addison-Wesley. ISBN 0-201-52374-4.
  • Santa Cruz Operation (1997) [1995], System V Application Binary Interface — Intel386 Architecture Processor Supplement (4th ed.), Santa Cruz, CA: The Santa Cruz Operation, Inc.
  • Santa Cruz Operation (1997) [1995], System V Application Binary Interface (4.1th ed.), Santa Cruz, CA: The Santa Cruz Operation, Inc.
  • Stevens, W. Richard (1990). UNIX® Network Programming. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-13-949876-1.
  • Stevens, W. Richard (1993). Advanced Programming in the UNIX® Environment (1st Edition, 15th Printing ed.). Reading, MA: Addison-Wesley. ISBN 0-201-56317-7.
  • Thomas, Rebecca (1986). Advanced Programmers Guide to UNIX® System V. Berkeley, CA: Osborne McGraw-Hill. ISBN 0-07-881211-9. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)CS1 maint: ref duplicates default (link)
  • UNIX System Laboratories (1995), System V Application Binary Interface (4th ed.), Englewood Cliffs, N.J.: UNIX System Laboratories
  • Waite Group (1987). Mitchel Waite (ed.). UNIX® Papers (2nd Printing ed.). Indianapolis, IN: Howard W. Sams & Company. ISBN 0-672-22578-6.
  • Zucker, Steve (1995) [1993], System V Application Binary Interface—PowerPc Processor Supplement, Mountain View, CA: SunSoft {{citation}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)CS1 maint: ref duplicates default (link)
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