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U9FS(4) 										  U9FS(4)

       u9fs - serve 9P from Unix

       u9fs [ directory ]

       U9fs  is  not  a Plan 9 program.  Instead it is a program that serves Unix files to Plan 9
       machines using the 9P protocol (see intro(5)).  It is to be invoked on a Unix  machine  by
       inetd  with its standard input, output, and error connected to a network connection, typi-
       cally TCP on an Ethernet.  It runs as user root and multiplexes access to multiple Plan	9
       clients	over  the  single  wire.  It simulates Unix permissions itself by assuming Plan 9
       uids match Unix login names.

       If a directory is specified u9fs first does a Unix chroot system call to that directory.

       Plan 9 calls this service 9fs with TCP service number 564 on the Ethernet.   Set  up  this
       way on a machine called, say, kremvax, u9fs may be connected to the name space of a Plan 9
       process by

	      9fs kremvax

       Due to a bug in some versions of the IP software, some systems will not accept the service
       name  9fs, thinking it a service number because of the initial digit.  If so, run the ser-
       vice as u9fs or 564 and do the srv and mount by hand:

	      srv tcp!kremvax!u9fs
	      mount -c /srv/tcp!kremvax!u9fs /n/kremvax

       For more information on this procedure, see srv(4) and bind(1).

       U9fs serves the entire file system of the Unix machine.	 It  forbids  access  to  devices
       because	the  program  is  single-threaded  and may block unpredictably.  Using the attach
       specifier device connects to a file system identical to the usual system except it permits
       device access (and may block unpredictably):

	      srv tcp!kremvax!9fs
	      mount -c /srv/tcp!kremvax!9fs /n/kremvax device

       (The 9fs command does not accept an attach specifier.)  Even so, device access may produce
       unpredictable results if the block size of the device is greater than  8192,  the  maximum
       data size of a 9P message.

       The  source to u9fs is in the Plan 9 directory /sys/src/cmd/unix/u9fs.  To install u9fs on
       a Unix system, copy the source to a directory on that system.  Edit the	makefile  to  set
       LOG  to a proper place for a log file and to set the compile-time configuration correctly.
       Then compile with an ANSI C compiler and install in /usr/etc/u9fs.  Install this  line  in

	      9fs     stream  tcp     nowait  root   /usr/etc/u9fs   u9fs

       and this in services:

	      9fs     564/tcp	    9fs  # Plan 9 fs


       Problems are reported to /tmp/u9fs.log.	A compile-time flag enables chatty debugging.

       bind(1), srv(4), ip(3), nfsserver(8)

       The implementation of devices is unsatisfactory.

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