d8caff6db672ab0f2d8064c61f5ef0e8e8d288ca
Ultimately, O_CLOEXEC should be off in fd 0, 1, 2, but when we open /dev/null here it's unlikely to be < 0, and after dupping the fd to 0, 1, 2 we turn off O_CLOEXEC explicitly anyway. Unless we know that what we are about to open will return 0, 1 or 2 we should always set O_CLOEXEC in order to be safe to other threads forking of subprocesses at the wrong moment.
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