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Test web application
This is a very simple test web application that can run in foreground mode and daemon mode. Its only purpose is to return a very simple static HTML page.
The most interesting part of this example is probably the daemonize
infrastructure (daemonize.h, daemonize.c) -- I have been trying to closely
follow systemd's recommendations for implementing traditional SysV daemons
(more info:man 7 daemon) sticking myself to POSIX standards as much as
possible.
To keep the code as clear as possible, I have encapsulated each recommended step into a function abstraction, and every failure yields a distinct error code so that we can easily trace the origins of the error.
The daemonize infrastructure is very generic -- you only need to provide a pointer to a function that initializes the daemon's state and a pointer to a function that runs the main loop.