[Chicken-janitors] #225: Add a predicate for port open/closed status (slot 8)

[Chicken Trac]

#225: Add a predicate for port open/closed status (slot 8)
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 Reporter:  sjamaan                |       Owner:  Felix
     Type:  enhancement            |      Status:  new  
 Priority:  not urgent at all      |   Milestone:  4.6.0
Component:  core libraries         |     Version:  4.6.0
 Keywords:  ports, closed, status  |  
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 Currently there's no way to check if a port is open or closed besides from
 performing an operation on it and checking whether it caused an exception
 or call ##sys#slot on it directly.

 It would be a good idea to add a port-closed? predicate. Here's a patch.

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Ticket URL: <http://www.irp.oist.jp/trac/chicken/ticket/225>
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