646853bdd8b1337204643aa014ff3f1f49d91a4f
According to its manual page, flags given to mkostemp(3) shouldn't include O_RDWR, O_CREAT or O_EXCL flags as these are always included. Beyond those, the only flag that all callers (except a few tests where it probably doesn't matter) use is O_CLOEXEC, so set that unconditionally.
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