sending signals to child process

[Sarir Khamsi]

I would like to start a child process (like w/ popen3(), or some such)
and then be able to interrupt it by sending it a control-c. How do I
do that in Python? Is there a better way to gracefully halt a child
process? Is there a more cross-platform way to start a child process
(popen() is only on UNIX/Win32)? Thanks.

Sarir