Network Programming with Perl

IO::Poll Events

IO::Poll allows you to monitor handles for a richer set of conditions than those made available by IO::Select. In addition to watching a handle for incoming data and the ability to accept outgoing data without blocking, IO::Poll allows you to watch handles for two levels of incoming "priority data," for end-of-file conditions, and for several different types of error. Each condition is known as an "event."

Each event is designated by one of the constants summarized in Table 16.1. They are divided into constants that can be added to bitmasks sent to poll() using the mask() method, and constants that are returned from poll() via the handles() method.

Table 16.1. IO::Poll Mask Constants

	TO poll()	FROM poll()	Description
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