catching signals and process IDs

Hi all

Have a small problem and need a solution.

We have two processes that were created in our main program. We need them to be able to send signals to each other. One child knows the pid of the other, and we need to send a signal from the other child 1 to child 2 so child 2 can learn the pid of child 1. Is there a way to catch this signal and learn the pid this way. Thanks.

if your talking about unix machines, then im pretty sure the "kill" function is used to only signal another process (id). any communication between the two processes would need to be done through files or (named or unnamed) pipes or sockets. unnamed pipes would probably be easiest and ideal.