What's the maximum pid for Mac OS X? The Mac OS X Internals book states that the maximum process identifier is 30,000 and after that the kernel will start re-using pids.  But checking on my own system, via:

ps a | grep ps | grep -v grep | awk '{print $1}'

I can see that I have pids that go higher.  Does anyone know if there is a pid_max explicitly set somewhere, like in Linux?
Looking at sys/proc_internal.h in xnu-1699.24.23, I find that PID_MAX is 99999.  The value is used in kern_fork.c in the function forkproc.  Looking at that function, process IDs are not assigned equal to PID_MAX, so the highest possible pid is 99998.