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man: document udevadm lock's exit code
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<para><command>udevadm lock</command> takes an (advisory) exclusive lock(s) on a block device (or
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multiple thereof), as per <ulink url="https://systemd.io/BLOCK_DEVICE_LOCKING">Locking Block Device
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Access</ulink> and invokes a program with the lock(s) taken. When the invoked program exits the lock(s)
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are automatically released.</para>
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are automatically released and its return value is propagated as exit code of <command>udevadm
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lock</command>.</para>
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<para>This tool is in particular useful to ensure that
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<citerefentry><refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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