| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="ts_linux-host-vboxsvc">
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| 4 | <title>VBoxSVC IPC Issues</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | On Linux, <ph conkeyref="vbox-conkeyref-phrases/product-name"/> makes use of a custom version of
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| 9 | Mozilla XPCOM (cross platform component object model) for
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| 10 | interprocess and intraprocess communication (IPC). The process
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| 11 | <userinput>VBoxSVC</userinput> serves as a communication hub between
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| 12 | different <ph conkeyref="vbox-conkeyref-phrases/product-name"/> processes and maintains the global
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| 13 | configuration, such as the XML database. When starting an
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| 14 | <ph conkeyref="vbox-conkeyref-phrases/product-name"/> component, the processes
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| 15 | <userinput>VBoxSVC</userinput> and <userinput>VBoxXPCOMIPCD</userinput>
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| 16 | are started automatically. They are only accessible from the
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| 17 | user account they are running under. <userinput>VBoxSVC</userinput>
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| 18 | owns the <ph conkeyref="vbox-conkeyref-phrases/product-name"/> configuration database which normally
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| 19 | resides in <filepath>~/.config/VirtualBox</filepath>, or the
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| 20 | appropriate configuration directory for your operating system.
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| 21 | While it is running, the configuration files are locked.
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| 22 | Communication between the various <ph conkeyref="vbox-conkeyref-phrases/product-name"/> components and
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| 23 | <userinput>VBoxSVC</userinput> is performed through a local domain
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| 24 | socket residing in
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| 25 | <filepath>/tmp/.vbox-<varname>username</varname>-ipc</filepath>.
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| 26 | In case there are communication problems, such as an
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| 27 | <ph conkeyref="vbox-conkeyref-phrases/product-name"/> application cannot communicate with
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| 28 | <userinput>VBoxSVC</userinput>, terminate the daemons and remove the
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| 29 | local domain socket directory.
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| 30 | </p>
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| 31 | </body>
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| 32 |
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| 33 | </topic>
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