I have been plagued with a browser closing before a long log file was displayed as running output of a C++ process in unix.
Keeping a browser open indefinitely is a trick that you'll need to get your web server to go along with. Web servers have differing strategies for how they handle what they
believe to be "runaway" CGIs.
One scheme you might try is to fork a separate process that uses HTTP::Daemon to set up a mini web server, then send back a redirect to the browser to point it to the new process. merlyn described this technique in a recent article (which isn't yet on-line, but the listing is here). This bypasses any of the web servers "runaway" detection. From the HTTP::Daemon process, you can dribble out output to your heart's content.
Oh. You said C++. Never mind.
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