how to forcely release heap in UNIX

From: manusha1980@xxxxxxxxx
Date: Mon, 29 Oct 2007 12:50:19 -0700

is there a system call to forcely release the unused heap-free store
memory in unix os's?
please check this link to see why i might need this.

http://c-faq.com/malloc/freetoOS.html

thanks

.

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