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man: Document return value of event source prepare callback (#4834)
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@ -76,10 +76,11 @@
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specified as <parameter>callback</parameter> will be invoked
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immediately before the event loop goes to sleep to wait for
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incoming events. It is invoked with the user data pointer passed
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when the event source was created. The callback function may be
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used to reconfigure the precise events to wait for. If the
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<parameter>callback</parameter> parameter is passed as NULL the
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callback function is reset. </para>
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when the event source was created. The event source will be disabled
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if the callback function returns a negative error code. The callback
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function may be used to reconfigure the precise events to wait for.
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If the <parameter>callback</parameter> parameter is passed as NULL
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the callback function is reset. </para>
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<para>Event source objects have no preparation callback associated
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when they are first created with calls such as
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