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I suspect that this is a perennial question (judging by a quick look at some list postings of the past)...

...but does anyone have either a patch or a package which implements a bidirectional popen()? One which allows not just "r" xor "w" like the standard version, but also "rw" so that I can use the file handle it returns to push data into and get data out of the stdin/stdout of the subprocess?

Oh, and which is portable between at least Linux and Windows, if not also OS X and the BSDs?