Network Programming with Perl

The IO::Select Module

Perl versions 5.003 and higher come with an object-oriented wrapper class called IO::Select. You create an IO::Select object, add to it the handles you wish to monitor, and then call its can_read(), can_write(), or has_exceptions() methods to wait for one or more of the object's handles to become ready for I/O.

$select = IO::Select->new([@handles]) The IO::Select new() class method creates a new IO::Select object. It can be called with a list of handles, in which case they will be added to the set that IO::Select monitors, or it can be called with an empty argument list, in which case the monitor set will be initially empty.

The handle list can be composed of any type of filehandle including IO::Handle objects, globs, ...