send password to pg_dump

Hello,

I'm trying to run pg_dump programmatically, and I'm wondering how I can send it a password.

I'm running it with a system() call in a child process, and sending the password in from the parent process on stdin, but somehow pg_dump always finds out how to ask my terminal for a password. How do I fool it?

(I need this to work in linux... in python would be preferable too.)

Thanks for any advice.

- Shaun