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49708181b5
The sequence should be the same for every fd: - Close the parent end of the pipe - If the child end of the pipe is not the intended fd already, - Dup it over - And close the old fd This fixes a double-close() in the read path (which is fairly harmless since it happens in the child, but sticks out in strace), some fd leakage, and the stderr-already-is-2 case.