If the hostname is a host
machine name and a single colon (:) separates the hostname and display
number, XOpenDisplay connects using TCP streams. If the hostname is
not specified, Xlib uses whatever it believes is the fastest transport.
If the hostname is a host machine name and a double colon (::) sepa-
rates the hostname and display number, XOpenDisplay connects using DEC-
net.
So it's supposed to be 'fastest transport' when no hostname is specified but from the other side it says that colon ':' specifes TCP (and '::' specifies DECnet). So there's some ambiguity here.
Andriy
Harold L Hunt II wrote:
Specify ":0.1" (note: no hostname) as the DISPLAY. That will use UNIX domain sockets, which I am assuming that X using when you pass NULL.
Harold
Andriy Rysin wrote:
Just found that if I use 'localhost:0.1' form, XOpenDisplay tries to connect with TCP stream, while if DISPLAY is NULL it choses fastest method it can find.
And actually running just 'xlsfonts' with X down gives error right away. The problem is that I have to check for screen 0.1.
Is there any way to use XOpenDisplay specifying screen 0.1 without forcing it to TCP mode?
Thanks, Andriy
Andriy Rysin wrote:
I've got a server program trying to connect to local X server on
command. If X runs everything is fine but if not timeout for
XOpenDisplay is pretty long. I tried to run 'xlsfonts -display
localhost:0.1' when X server is down and got about 6 sec delay. It's
probably reasonable for remote X server because of network delays but
for localhost there is probably a faster way. Delay is crucial in my
case - I need to know if X is down in less than 2 sec, is there any mean
to know really quick if local server is down?
Thanks in advance, Andriy
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