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What is the @ character in beginning section of sockets's path in output of "netstat -a" command?

unix 3 [ ] STREAM CONNECTED 10868 1261/X @/tmp/.X11-unix/X0

unix 3 [ ] STREAM CONNECTED 13901 1537/dbus-daemon @/tmp/dbus-bzqSWN4VUU

unix 3 [ ] STREAM CONNECTED 11248 1603/dbus-daemon @/tmp/dbus-ifHSrM07KF

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It indicates that the socket exists in the abstract namespace. That is to say, there is no socket file in the filesystem named "/tmp/.X11-unix/X0" etc, so they can not be opened using the normal file open() system call, but rather can only be opened using the socket connect() call.

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