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man: document the Dump() calls of the PID 1 D-Bus interface, and what they are
(cherry picked from commit 0df8512124
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@ -554,10 +554,6 @@ node /org/freedesktop/systemd1 {
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<!--method ListUnitsByNames is not documented!-->
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<!--method Dump is not documented!-->
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<!--method DumpByFileDescriptor is not documented!-->
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<!--method ListUnitFilesByPatterns is not documented!-->
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<!--method PresetUnitFilesWithMode is not documented!-->
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@ -1312,6 +1308,20 @@ node /org/freedesktop/systemd1 {
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all clients which previously asked for <function>Subscribe()</function> either closed their connection
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to the bus or invoked <function>Unsubscribe()</function>.</para>
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<para><function>Dump()</function> returns a text dump of the internal service manager state. This is a
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privileged, low-level debugging interface only. The returned string is supposed to be readable
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exclusively by developers, and not programmatically. There's no interface stability on the returned
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string guaranteed, and new fields may be added any time, and old fields removed. The general structure
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may be rearranged drastically between releases. This is exposed by
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<citerefentry><refentrytitle>systemd-analyze</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<command>dump</command> command. The <function>DumpByFileDescriptor()</function> method is identical to
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<function>Dump()</function> but returns the data serialized into a file descriptor (the client should
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read the text data from it until hitting EOF). Given the size limits on D-Bus messages and the possibly
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large size of the returned string, <function>DumpByFileDescriptor()</function> is usually the
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preferable interface, since it ensures the data can be passed reliably from the service manager to the
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client. (Note though that <function>DumpByFileDescriptor()</function> cannot work when communicating
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with the service manager remotely, as file descriptors are strictly local to a system.)</para>
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<para><function>Reload()</function> may be invoked to reload all unit files.</para>
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<para><function>Reexecute()</function> may be invoked to reexecute the main manager process. It will
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