Used to update or read the signal mask of a task. ## Notes If `old_set` is not `None`, the previous value of the signal mask is stored in oldset. If `set` is `None`, then the signal mask is unchanged (i.e., `how` is ignored), but the current value of the signal mask is returned in `old_set` (if it is not `None`).
(&self, how: SigProcMask, set: Option<u64>, old_set: Option<&mut u64>)
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