inportp

inportp( 
g_obj 
) 
=> t / nil

Checks if an object is an input port.

An input port may be closed, so if inportp returns t, that does not guarantee a successful read from the port.

g_obj

Any SKILL object.

`t`	The given object is an input port.
`nil`	The given object is not an input port.

(inportp piport)   
=> t

(inportp poport)   
=> nil

(inportp 123)      
=> nil