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<title>
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preface4
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<body BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#330088" ALINK="#FF0044">
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<H1>Preface to the Fourth (2002) Edition
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</H1>
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<br> <br>
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Plan 9 continues to grow and adapt.
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The fourth major release of the system
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incorporates a number of changes, but the most central
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is the conversion to a new version of the 9P file system
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protocol.
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This new version was motivated by a desire to support
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files with name elements longer than 27 bytes (the old
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<TT>NAMELEN</TT>),
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but the opportunity was taken to change a number of other things
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about the protocol,
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making it more efficient, more flexible, and easier to encapsulate.
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One simple but indispensable new feature made possible by the protocol
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change is that the system now records the user who last modified a file;
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try
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<TT>ls</TT>
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<TT>-m</TT>
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to identify the culprit.
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<br> <br>
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Many aspects of system security have been improved.
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The new security agent
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<A href="/magic/man2html/4/factotum"><I>factotum</I>(4)
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</A>maintains user passwords, while
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<A href="/magic/man2html/8/secstore"><I>secstore</I>(8)
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</A>keeps them safe and enables single sign-on to multiple domains and machines
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using a variety of secure protocols and services.
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<br> <br>
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Throughout the system, components have been rewritten and interfaces
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modified to eliminate restrictions, improve performance, and clarify design.
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The full list is too long to include here, but significant changes have occurred
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in a number of system calls
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<A href="/magic/man2html/2/wait">(<I>wait</I>(2),
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</A><A href="/magic/man2html/2/stat"><I>stat</I>(2),
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</A><A href="/magic/man2html/2/mount"><I>mount</I>(2),
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</A>and
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<A href="/magic/man2html/2/errstr"><I>errstr</I>(2)),
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</A>the thread library
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<A href="/magic/man2html/2/thread">(<I>thread</I>(2)),
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</A>formatted printing
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<A href="/magic/man2html/2/print">(<I>print</I>(2)
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</A>and
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<A href="/magic/man2html/2/fmtinstall"><I>fmtinstall</I>(2)),
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</A>security
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(many pages in section 2, including
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<A href="/magic/man2html/2/auth"><I>auth</I>(2),
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</A><A href="/magic/man2html/2/authsrv"><I>authsrv</I>(2)),
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</A>and many others.
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<br> <br>
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The changes are sweeping and are accompanied by many new programs, tools,
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services,
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and libraries.
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See the manual pages and the accompanying documents for more information.
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<br> <br>
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<br> <br>
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<DL><DT><DD>
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<DL><DT><DD>
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<DL><DT><DD>
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<DL><DT><DD>
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<DL><DT><DD>
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<DL><DT><DD>
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Bell Labs
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<br>
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Computing Science Research Center
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<br>
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Murray Hill NJ
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<br>
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April, 2002
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<br> <br>
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<A href=http://www.lucent.com/copyright.html>
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Copyright</A> © 2002 Lucent Technologies Inc. All rights reserved.
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</body></html>
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