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Guard type that keeps selected Unix signals suppressed.

```rust use uninterruptible::Uninterruptible;

// catch terminate signals (SIGTERM, SIGQUIT, SIGINT) let u = Uninterruptible::terminate()?;

// do work, e.g. call in sub-process

u.checkpoint()?; // fails if the process recived one of the terminate signals (e.g. CTRL-C was pressed)

drop(u); // revert to default signal handlers ```

See module level documentation on [docs.rs] for more examples.