dope 0.12.0

The manifold runtime
Documentation 
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use std::io;

use crate::DriverContext;
use std::io::Error;
use std::io::ErrorKind;

pub(in crate::runtime) struct SignalState;

impl SignalState {
    pub(in crate::runtime) fn new() -> io::Result<Self> {
        Err(unsupported())
    }

    pub(in crate::runtime) fn try_register(
        &self,
        _driver: &mut DriverContext<'_, '_>,
    ) -> io::Result<()> {
        Err(unsupported())
    }
}

fn unsupported() -> Error {
    Error::new(
        ErrorKind::Unsupported,
        "signal shutdown is only available on Linux",
    )
}