How to detect memory leaks

[Vest.Michael]

Dear FreeBSD,

     Do you know how to detect memory leaks in applications running on
FreeBSD?
     We have an application written in C that is running on FreeBSD 3.4 and
4.5. We
suspect that there are some memory leaks in the application, but are unsure
how to
track them down. Do you know of any tools or procedures that we can use to
determine
where the leaks are?

Mike Vest