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<?xml version="1.0" encoding="utf-8"?>
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<chapter xml:id="event.flags" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Event flags</title>
<para>
<constant>Event::READ</constant>
This flag indicates an event that becomes active when the provided file
descriptor (usually a stream resource, or socket) is ready for reading.
</para>
<para>
<constant>Event::WRITE</constant>
flag indicates an event that becomes active when the provided file
descriptor (usually a stream resource, or socket) is ready for writing.
</para>
<para>
<constant>Event::SIGNAL</constant>
used to implement signal detection. See "Constructing signal events" below.
</para>
<para>
<constant>Event::TIMEOUT</constant>
indicates an event that becomes active after a timeout elapses. The
<constant>Event::TIMEOUT</constant>
flag is ignored when constructing an event: one can either set a timeout
when event is
<emphasis>added</emphasis>,
or not. It is set in the
<literal>$what</literal>
argument to the callback function when a timeout has occurred.
</para>
<para>
See also
<link
xlink:href="http://www.wangafu.net/~nickm/libevent-book/Ref4_event.html#_the_event_flags">Fast
portable non-blocking network programming with Libevent, Working with events,
Event flags</link>
</para>
</chapter>
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