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Closing the original stdout is how we signal to a larger compatibility tool (in practice pressure-vessel) that either we are ready, or we have crashed: when every process that held the write end open has closed it, the compatibility tool sees EOF on the pipe. If the FEXServer inherits stdout and holds it open, then that state will never be reached. steamrt/tasks#870 Signed-off-by: Simon McVittie <smcv@collabora.com>