Here for xterm, I observe it does writev(), recvfrom() and recvmsg() system calls on file descriptor 3 for that. One approach could be to use strace (or the equivalent command on your system if not Linux) to trace the send/receive system calls that your application does to communicate with the X server. Now, if you can't change $DISPLAY and want to capture the traffic of an already running local X application that uses unix domain sockets, that's where it gets tricky. You can then set $DISPLAY to localhost:4 and capture the network traffic as above or tell socat to dump it with -x -v. If it doesn't, you can use socat as a man in the middle that accepts connections as TCP and forwards them as unix or abstract: socat tcp-listen:6004,reuseaddr,fork unix:/tmp/.X11-unix/X4 1 day ago &0183 &32 FuboTV, which also offers a free trial, is another option if you’re looking for a streaming service with a lot of TV shows, live sporting events, live TV and more. If your X server listens on TCP (but they tend not to anymore nowadays), the easiest is to change DISPLAY to localhost:4 instead of :4 and capture the network traffic on port 6004 on the loopback interface. Xscope Measuring is a cloud-based web measurement platform designed to help contractors save time, increase sales and grow their business. Either /tmp/.X11-unix/X4 or the same path in the ABSTRACT namespace (usually shown as in netstat output). When $DISPLAY is only :4 (short for unix/:4), then clients use a unix domain socket. In that case, you can capture the traffic with any network sniffer like tcpdump or wireshark by capturing the TCP traffic on that port.
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The TCP port is then 6000 plus the display number (in that case 6004). When DISPLAY is set to host:4, short for tcp/host:4, clients use TCP to connect to the server. You can talk X11 over TCP, or over a Unix domain socket or (on Linux) on a Unix domain socket in the abstract namespace.
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