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Clarify WAIT_FOR documentation
The path is relative to the sysfs device, so this provides an easy way to wait for an attribute to appear.
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@ -466,7 +466,8 @@
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<term><option>WAIT_FOR</option></term>
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<listitem>
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<para>Wait for a file to become available or until a 10
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seconds timeout expires.</para>
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seconds timeout expires. The path is relative to the sysfs device,
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i. e. if no path is specified this waits for an attribute to appear.</para>
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</listitem>
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</varlistentry>
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