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Choung Park requested to merge cspark-gitlab/libxcb:master into master

This patch extends the existing libxcb protocol framework for AF_VSOCK by adding a new protocol name 'vsock':


For example, in order to have X11 clients running in a virtual machine forwarded to the X11 server running in the host, you can set the DISPLAY variable as:

export DISPLAY=vsock/2:0.0

It can be shortened as the following:

export DISPLAY=vsock/:0

'2' is the assigned number for VMADDR_CID_HOST and it's used as a default value when it's not found in the DISPLAY variable. For a port number, it can be any 'unsigned int', but in order to maintain consistency, it's defined the same as the TCP method: 6000 + <display_number>.

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