IEEE1284_REF

Section: Functions (3)
Updated: 07/26/2009
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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.

AUTHOR

Tim Waugh <twaugh@redhat.com>

: Author.