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Simon McVittie authored
This is not used by default, but can be configured by OS builders (or regression-test environments) if desired. If used, this listens on $XDG_RUNTIME_DIR/bus, or fails if $XDG_RUNTIME_DIR is not set. Fallback behaviour is unnecessary, because it is already possible to use a string of semicolon-separated addresses like <listen>unix:runtime=yes;unix:tmpdir=/tmp</listen>, resulting in listening on either $XDG_RUNTIME_DIR/bus or /tmp/something. We use a non-abstract socket here, because that is desirable for use with Linux containers: abstract sockets are attached to the network namespace, whereas non-abstract sockets are part of the filesystem and can be bind-mounted between domains if necessary. The major advantage of abstract sockets is that they do not need cleanup, but the specification of XDG_RUNTIME_DIR guarantees to provide cleanup anyway. Based on prior work by Simon McVittie, Colin Walters and Alexander Larsson. Bug: https://bugs.freedesktop.org/show_bug.cgi?id=61303 Reviewed-by: Philip Withnall <philip.withnall@collabora.co.uk>
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