title: What API do I call to get the system uptime?
body: <p>I would like to get the system uptime from within a C application running on a linux-based system.  I don't want to call uptime(1) and parse the output, I'd like to call the underlying C API I suspect exists.  Anyone know if there is such a call, or does uptime(1) simply process records obtained from wtmp?</p>