POpen, opening lots of processes

Hi, I'm using POpen to shell out to a command several hundreds or thousands of times per call (none of them simultaneous, though, this is completely serial). After running my program for a while, I get: Fail: resource exhausted Action: forkProcess Reason: Resource temporarily unavailable which basically seems to be telling me that the program hasn't been closing the old processes, even though they're definitely not in use anymore. Does anyone have any suggestions how to get around this? Thanks! - Hal -- Hal Daume III | hdaume@isi.edu "Arrest this man, he talks in maths." | www.isi.edu/~hdaume