UNIX SVR4

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UNIX SVR4

• COSC513
• Zhaohui Chen
• Jiefei Huang

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UNIX SVR4

• UNIX system V release 4 is a major new release of
  the UNIX operating system, developed by ATT and
  Sun microsystems
• Goals standardization of the UNIX system and
  introduction of new technology

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Standardization of the UNIX system

• Previous operating systems are open systems.
• SVR4 is developed to provide a uniform platform
  for commercial
• It combines features from SVR3 , BSD4.3 , SunOS
  and Microsoft XENIX system V.

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Introduction of new technology

• Extends networking capabilities
• Improves system administration and maintenance
• Further internationalizes the UNIX system

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SVR4 new features

• Operating system enhancements
• File system enhancements
• Networking
• System administration and maintenance
• Real-time support

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SVR4 new features

• Character user interface
• Graphical user interface
• Internationalization
• C language
• Extended terminal interface

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Operating system enhancements

• SVR4 uses a virtual memory architecture based on
  SunOS which has efficient use of systems main
  memory and capability to execute very large
  programs.

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Additional benefits

• Mapped files allows a file to be mapped
  explicitly into the address
• space of a user program. This makes user program
  easier to write and allows programs to execute
  more efficiently.

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File system enhancements

• Virtual file system allows several
• different file system types to coexist
• on the same system.
• rfs (BSD based)
• nfs (SunOS based)
• s5 (earlier UNIX release based)

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System administration and maintenance

• Software installation and configuration
  management tools allows an administrator easy
  access to information
• System administration menus allows a user to
  administer a UNIX system without knowledge of
  UNIX system commands.

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Real-time processing

• User-controlled process scheduler kernel code
  that determines what program will run, when, and
  for how long.
• High-resolution timers gives microsecond
  resolution, good for applications deal with very
  short time intervals.

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Character-based user interface

• Framed access command environment
  an interface allows a user to see the UNIX
  system through frames containing menus and forms.
  
• SVR4 enhanced FACE to be more consistent and
  adding applications to FACE has been made easier.

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Graphical user interface

• OPEN LOOK graphical user interface defines a
  standard for the look and feel of the GUI
  applications.
• XWIN graphical windowing system gives
  the user the ability to create multiple windows
  on a single display,with each window running
  different applications.

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Internationalization

• Support for multiple international code sets and
  character
• Translate system messages to the users native
  language
• Support the national conventions used to
  communicate

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C language

• Enhanced c packages C programming language
  utilities(CPLU), Advanced programming
  utilities(APU), C programmer productivity
  tools(CPPT).
• New features dynamic linking
  dynamic tables . . .

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Extended terminal interface

• Standard programming interface provided in
  release 4 for character screen management and
  character operations.
• Consists of 3 libraries
• Provides C subroutines for creating forms ,
  menus, form editing functions,panels

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Networking on UNIX SVR4
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Networking on UNIX SVR4

• UNIX SVR4 merges the networking facilities of
  UNIX SVR3, BSD4.2 and 4.3, and SunOS.
• It also introduces new networking routines .

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From UNIX SVR3

• Transport level interface (TLI)
• Remote file sharing mechanism(RFS)
• Streams

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From BSD 4.2 and 4.3

• TCP/IP protocols
• Sockets
• Inetd facility

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From SunOS

• Network file system (NFS)

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New facilities in SVR4

• The network selection mechanism
• Name-to-address mapping

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Transport level interface (TLI)

• TLI defines an interface between applications and
  transport level network protocols, relieving user
  programs of the need to know the protocol
  characteristics.

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Remote file sharing (RFS)

• It provides transparent access to remote files
  and devices .

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Stream

• A framework for developing network protocols
• It defines standard interfaces that allow
  networking architectures and high-level protocols
  to be independent of underlying
  protocols,drivers,and media.

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TCP/IP

• UNIX system V release 4 supports TCP/IP and
  supports networking among systems of different
  types.

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Sockets

• Sockets is a networking interface widely used in
  BSD systems which defines how a process accesses
  the services of a protocol.
• In SVR4, sockets is provided in a library so that
  BSD applications that use sockets can migrate
  easily to SVR4.

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Inted

• In release 4 , UNIX system V supports inetd, a
  port monitor that waits for service requests from
  computers on a TCP/IP network.
• When a connection request arrives, inted spawns
  the server process and passes the network
  connection to it.

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Network file system (NFS)

• A standard for sharing files between different
  machines, operating systems in a network
• Users can get directly to the files they want
  without knowing the network address of the date.

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Network selection

• New features in UNIX SVR4
• it allows network applications to choose the
  network over which they will communicate.
• If an application fails to connect with its first
  choice, it can select different networks until it
  finds one that meets its requirements and allows
  the connection.

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Network selection

• With Network selection, an application does not
  need a network selection embedded in its code.
  This allows the application to run without
  modification on different systems that support
  different networks.

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Name-to-address mapping

• Name-to-address mapping is a mechanism that
  allows network clients to determine the addresses
  of servers on a network in a network independent
  manner.

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Name-to-address mapping

• This mechanism makes it possible for clients to
  reach a server, even if the address on which the
  server is listening should change.
• It also allows a client to reach a server over
  different networks.

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References

• ATT,UNIX SYSTEM V/386 RELEASE 4 product overview
  and master index, Unix press 1991
• Michael Padovana, Networking applications on UNIX
  system V release 4, Prentice Hall 1993
• M Santifaller, TCP/IP and NFSinternetworking in
  a UNIX environment,Addison-Wesley 1994
• Mark G Sobell,Unix system Va practical guide,
  Addison-Wesley 1995
• http//www.stokely.com/unix.sysam.resources/index.
  html
• http//darkwing.uoregon.edu/hak/unix.html