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    <p>Firstly, would it make sense to put these two servers into one program? If so, you won't have to communicate between processes, and the whole logic becomes substantially easier. You will have to think about doing asynchronous input and output, and the <code>select()</code> function is designed for just this. There will be many explanations around on how to do this, and a quick look finds <a href="http://www.gnu.org/s/libc/manual/html_node/Waiting-for-I_002fO.html" rel="nofollow">this page</a>.</p> <p>However, if you <em>must</em> have two separate processes, then you will need to choose a mechanism for <a href="http://en.wikipedia.org/wiki/Inter-process_communication" rel="nofollow">inter-process communication</a>, of which there are several, and your choice will be affected by your operating system. A <a href="http://en.wikipedia.org/wiki/Pipeline_%28Unix%29" rel="nofollow">pipe</a>, if available, might be suitable, as might a Unix <a href="http://en.wikipedia.org/wiki/Named_pipe" rel="nofollow">named pipe</a>. Or you could look into third-party message passing frameworks, or just use shared memory and/or semaphores (but be very careful!).</p>
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    1. COTim, thanks, that helps a lot getting started with this. I have it setup this way basically: toplevel-file.c, toplevel-file.h, udp-program.c udp-program.h tcp-program.c tcp-program.h and finally net.c and net.h (which I put all the UDP / TCP simple socket functions in). I thought this method would make it easier since the UDP server will be busy keeping another device up. If you think it's easier to put it ALL in the top level file (which I normally never do), than I can do that. Select definitely seems easier to implement than a pipe, but having one file (or one process) makes things messy.
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    2. CODon't forget that a single compiled program can come from multiple source files, which can help keep different parts of the program separate. Just make sure that there's only one `main()` function, and check your development system documentation about how to compile and link several source files.
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    3. COOh sorry Tim, in that case, it is only "one program". I just have multiple source files. The only thing is, I forked the UDP server to run off the side currently so that I could also monitor for incoming TCP requests with the TCP program (so right now, when the user calls start on the main program, it runs and forks the UDP server, and runs the TCP server, only problem I have is obv. the communication between them). This is why I was confused when you said multiple processes. I will look into both solutions: fork/pipes and select but which would be easier to implement for something like this?
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