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   unix    ( 7 )

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Примечание (Note)

Binding to a socket with a filename creates a socket in the
       filesystem that must be deleted by the caller when it is no
       longer needed (using unlink(2)).  The usual UNIX close-behind
       semantics apply; the socket can be unlinked at any time and will
       be finally removed from the filesystem when the last reference to
       it is closed.

       To pass file descriptors or credentials over a SOCK_STREAM
       socket, you must send or receive at least one byte of
       nonancillary data in the same sendmsg(2) or recvmsg(2) call.

       UNIX domain stream sockets do not support the notion of out-of-
       band data.