openportp

openportp( 
g_obj 
) 
=> t / nil

Description

Checks if the given argument is a port object and it is open (for input or output), nil otherwise.

Arguments

Value Returned

Examples

(portp ip = (infile “inFile”)) 
=> t
(portp op = (outfile “outFile”)) 
=> t
(openportp ip) 
=> t
(openportp op) 
=> t
(close ip) 
=> t
(openportp ip) 
=> nil
(close op) 
=> t
(openportp op) 
=> nil

Related Topics

Input Output Functions