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CentOS 7.0 - man page for ieee1284_unref (centos section 3)

IEEE1284_REF(3) 			    Functions				  IEEE1284_REF(3)

NAME
       ieee1284_ref, ieee1284_unref - modify a port's reference count

SYNOPSIS
       #include <ieee1284.h>

       int ieee1284_ref(struct parport *port);

       int ieee1284_unref(struct parport *port);

DESCRIPTION
       If you want to free the port list from ieee1284_find_ports but open one of the ports later
       on, you will need to prevent it from being destroyed in ieee1284_free_ports. Each port has
       a reference count, and you can use ieee1284_ref to increment it and ieee1284_unref to
       decrement it.

       If you use ieee1284_ref at any stage, you must later call ieee1284_unref to relinquish the
       extra reference. If you do not do this, the resources associated with the port will not be
       cleaned up.

       If you have not previously used ieee1284_ref on a port, you must not use ieee1284_unref on
       it.

RETURN VALUE
       These functions return the number of references held after the increment or decrement.

SEE ALSO
       ieee1284_open(3)

AUTHOR
       Tim Waugh <twaugh@redhat.com>
	   Author.

COPYRIGHT
       Copyright (C) 2001-2003 Tim Waugh

[FIXME: source] 			    06/17/2014				  IEEE1284_REF(3)


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