Uptime under linux in C

Question

How can I retrieve uptime under linux using C? (without using popen and/or /proc)

Thanks

Answer 1

To get the system start time in a more portable way, would be to use "who -b". To use this in a program you would have to spawn a shell and interpret its output. Unfortunately this seems the only place where such an information is available in POSIX, and this also only as an extension.