Detection "connection reset by peer" in mod_perl before send a response

Dear all.

I need to detect that user pressed escape, apache receives it like "connection reset by peer" (I saw 
it with truss, freebsd strace), before my script will send a response to client.

I can explain: my script works some time (about 2-3 sec), it gathers some data. Within this period 
it is possible that user decide to press escape or even to close the page or browser.

I need to detect it and clean some temporary files, what is normally happen by additional request 
from script on the page.

I need your advice how to do it.

Thanks.