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<pre>Network Working Group G. Marcy
Request for Comments: 1096 Carnegie Mellon University
March 1989
<span class="h1">Telnet X Display Location Option</span>
Status of This Memo
This RFC specifies a standard for the Internet community. Hosts on
the Internet that transmit the X display location within the Telnet
protocol are expected to adopt and implement this standard.
Distribution of this memo is unlimited.
This standard is modelled on <a href="./rfc1079">RFC 1079</a> [<a href="#ref-1" title=""Telnet Terminal Speed Option"">1</a>], the telnet terminal speed
option. Much of the text of this document is copied from that RFC.
Motivation
When a user is running the Telnet client under the X window system,
it is useful for the remote Telnet to know the X display location of
that client. For example, the user might wish to start other X
applications from the remote host using the same display location as
the Telnet client. The purpose of this option is to make this
information available through telnet connections.
<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>. Command Name and Code</span>
X-DISPLAY-LOCATION (XDISPLOC)
Code = 35
<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>. Command Meanings</span>
IAC WILL X-DISPLAY-LOCATION
Sender is willing to send the X display location in a
subsequent sub-negotiation.
IAC WON'T X-DISPLAY-LOCATION
Sender refuses to send the X display location.
IAC DO X-DISPLAY-LOCATION
Sender is willing to receive the X display location in a
subsequent sub-negotiation.
<span class="grey">Marcy [Page 1]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-2" ></span>
<span class="grey"><a href="./rfc1096">RFC 1096</a> Telnet X Display Location Option March 1989</span>
IAC DON'T X-DISPLAY-LOCATION
Sender refuses to accept the X display location.
IAC SB X-DISPLAY-LOCATION SEND IAC SE
Sender requests receiver to transmit his (the receiver's) X
display location. The code for SEND is 1. (See below.)
IAC SB X-DISPLAY-LOCATION IS ... IAC SE
Sender is stating his X display location. The code for IS is
0. (See below.)
<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>. Default</span>
WON'T X-DISPLAY-LOCATION
The X display location will not be exchanged.
DON'T X-DISPLAY-LOCATION
The X display location will not be exchanged.
<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>. Description of the Option</span>
WILL and DO are used only to obtain and grant permission for future
discussion. The actual exchange of status information occurs within
option subcommands (IAC SB X-DISPLAY-LOCATION...).
Once the two hosts have exchanged a WILL and a DO, the sender of the
DO X-DISPLAY-LOCATION is free to request the X display location.
Only the sender of the DO may send requests (IAC SB X-DISPLAY-
LOCATION SEND IAC SE) and only the sender of the WILL may transmit
actual X display location (within an IAC SB X-DISPLAY-LOCATION IS ...
IAC SE command). The X display location may not be sent
spontaneously, but only in response to a request.
The X display location is an NVT ASCII string. This string follows
the normal Unix convention used for the DISPLAY environment variable,
e.g.,
<host>:<dispnum>[.<screennum>]
No extraneous characters such as spaces may be included.
The following is an example of use of the option:
<span class="grey">Marcy [Page 2]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-3" ></span>
<span class="grey"><a href="./rfc1096">RFC 1096</a> Telnet X Display Location Option March 1989</span>
Host1: IAC DO X-DISPLAY-LOCATION
Host2: IAC WILL X-DISPLAY-LOCATION
(Host1 is now free to request status information at any time.)
Host1: IAC SB X-DISPLAY-LOCATION SEND IAC SE
Host2: IAC SB X-DISPLAY-LOCATION IS "SRI-NIC.ARPA:0.0" IAC SE
(This command is 22 octets.)
<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>. Implementation Suggestions</span>
Since the X display location may not contain a hostname on the client
host, i.e., ":0" or "unix:0.0", the Telnet client will need to modify
the location appropriately before sending it on to the remote Telnet.
Reference
[<a id="ref-1">1</a>] Hedrick, C., "Telnet Terminal Speed Option", <a href="./rfc1079">RFC 1079</a>,
Rutgers University, December, 1988.
Author's Address:
Glenn A. Marcy
Carnegie Mellon University
School of Computer Science
Pittsburgh, PA 15213-3890
Phone: (412) 268-7669
Email: Glenn.Marcy@CS.CMU.EDU
Marcy [Page 3]
</pre>
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