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Plan 9 - man page for dk (plan9 section 3)

DK(3)				     Library Functions Manual				    DK(3)

NAME
       dk - Datakit conversations

SYNOPSIS
       bind #kname /net/dk
       bind #iname /net/dk

       ctlfd = open(".../ctl", ORDWR);
       write(ctlfd, "push dkmux", 10);
       write(ctlfd, "config csc [no]restart name nvc window", n);

DESCRIPTION
       A Datakit device--either k for the regular Datakit or i for the Incon--is a directory con-
       taining up to 256 directories, one per virtual circuit, named 0 through 255, and a special
       file named clone.  The specifier name matches the Datakit device to a physical device that
       its virtual circuits are multiplexed over (see dkmux below).

       Normally, the standard routines dial, hangup, listen, and announce (see dial(2)) are  used
       to  make, listen for, and control calls over any network.  The routines expect the follow-
       ing properties of any multiplexed network, not just Datakit.

       Opening the clone file opens the ctl file of an unused virtual circuit.	Reading  any  ctl
       file  returns  the  name of the virtual circuit directory.  For example, reading #k/17/ctl
       will return the string 17.

       Each virtual circuit directory contains the files:

       ctl	 to control the virtual circuit: establish a connection, hang it up, etc.

       data	 to converse with the remote end (via read and write)

       listen	 to listen for calls (after announcing; see below)

       other	 information about the conversation

       raddr	 the address of the remote end

       ruser	 the id of the user at the remote end (when applicable)

       To set up and tear down virtual circuits a process writes  textual  commands  to  the  ctl
       file:

       connect addr	 connect  to address addr.  If the connection fails, the write returns an
			 error.

       hangup		 tear down a connected virtual circuit.

       announce name	 announce the readiness to accept calls to name.

       accept n 	 accept the call on virtual circuit n.

       reject n e	 reject the call on virtual circuit n with error code e.   E  must  be	a
			 number from 0 to 7.

       Once  a virtual circuit is set up, a process can converse with the remote service by read-
       ing and writing the data file.  Write boundaries are preserved.

       Accepting calls to name requires the following dance:

       1)     announce name on a virtual circuit.

       2)     open the listen file in that virtual circuit's directory.  When a call comes in  on
	      a  virtual  circuit for name, the open will return with the file descriptor open to
	      the control file of the incoming virtual circuit.

       3)     accept or reject the call by writing an accept or reject command to the ctl file of
	      the announced virtual circuit.

       A  dkmux  module  pushed  onto  a  stream  makes that stream a multiplexed connection to a
       Datakit.  The subsequent config control message configures the multiplexer and matches  it
       to a dk device.	The parameters to the config message are

       csc    the line number of the common signaling channel (must be > 0)

       nvc    the number of virtual circuits (optional; default chosen by Datakit)

       [no]restart
	      the  word  restart  or norestart (optional; default is restart).	Restart tells the
	      Datakit to forget all previous connections and authentications for this machine.

       name   The name used in binding dk device.

       window the default URP window size for virtual circuits on this Datakit line  (default  is
	      2048).

FILES
       #k/clone
       #k/[0-255]
       #k/[0-255]/data
       #k/[0-255]/ctl
       #k/[0-255]/listen
       #k/[0-255]/ruser
       #k/[0-255]/raddr

SEE ALSO
       stream(3), dkconfig(8), datakit(3)

SOURCE
       /sys/src/9/*/devdk.c

											    DK(3)


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