[fprint] Cancel the enrolling process and memory leak?

[Pavel M.]

Hello,

How can I cancel the enrolling process executed by fp_enroll_finger 
(struct fp_dev *dev, struct fp_print_data **print_data) ? Do I have to 
create a thread and terminate it every time I want to cancel the 
enrolling? It doesn't sound to be the best solution to me because such 
terminating usually is unsafe. I can't find any information about it in 
the libfprint's documentation except "Synchronity/asynchronity". If I 
understand it right the fprint_demo and other applications using the 
libfprint work unfortunately in that way.

I wonder also why fp_enroll_finger(...) is consuming so much memory? 
When the fprint_demo is waiting for an enrollment it's leaking about 100 
kB RAM per second. When I open the fprint_demo it takes about 5MB RAM 
but when I start the enrolling process by pressing "Enroll" but don't 
enroll my fingerprint the application's memory consumption increases 
after some minutes to more than 40 MB a and continues to increase until 
I scan the fingerprint or exit the application. Is something wrong with 
my driver, scanner(AuthenTec AES1610) or the libfprint?

Thanks in advance for your help!

Pavel M.