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Message: [QUOTE="Gordon Beaton, post: 1928854"] There is no general way to know how many file descriptors you've got open, except by keeping track of every Socket, ServerSocket, and FileInputStream you open (and I've probably missed some), and knowing when library methods open these things for you (as Runtime.exec() does). On Linux you can cheat a little by counting the files in /proc/self/fd, and you can check the limit with "ulimit -n". But this seems to like a lot of trouble, I don't see the point of knowing that they will "soon" run out, because you'll get an exception when you attempt to exceed the limit anyway (so why stop sooner). What real problem are you trying to solve? /gordon [/QUOTE]