Way too many ways to wait on a child process with a timeout

https://gaultier.github.io/blog/way_too_many_ways_to_wait_for_a_child_process_with_a_timeout.html

Nice tour through a bunch of options for timing out a process in C, considering a bunch of options that are more or less portable.

It's pretty unsatisfying that in the end, there is no great general solution to what seems like it should be a simple problem.

The source for all examples is on github