[Bug 253277] x11/xtrans: Don't unlink existing UNIX sockets => allows multiple X sessions from sddm

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253277

            Bug ID: 253277
           Summary: x11/xtrans: Don't unlink existing UNIX sockets =>
                    allows multiple X sessions from sddm
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: olivier.freebsd at free.fr
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

Created attachment 222189
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=222189&action=edit
Patch against the ports tree

Patch that removes the `unlink` call before binding some UNIX socket.

The problem with the existing approach is that, when Xorg is launched as
`root`, it can always unlink existing sockets, which it does when no display is
explicitly specified and `-displayfd` is used.

Moreover, the X server removes the UNIX socket when exiting (even in most
abnormal cases).

Typically, sddm exactly triggers the problem. So when you try to open another
session through it, the first session's sockets are crushed and it becomes
stale.

I'm proposing the patch here since it is not practically useful on platforms
that launch Xorg with an unprivileged user and because upstream seems inactive.

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