hl-engine 0.1.0

Safe Rust lifecycle API for the standalone HL Linux guest engine
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use crate::Error;

/// Completed guest status.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum Exit {
    Code(i32),
    Signal(i32),
    Fault { status: i32, detail: u64 },
}
impl Exit {
    #[must_use]
    pub const fn code(self) -> Option<i32> {
        if let Self::Code(value) = self {
            Some(value)
        } else {
            None
        }
    }
    #[must_use]
    pub const fn signal(self) -> Option<i32> {
        if let Self::Signal(value) = self {
            Some(value)
        } else {
            None
        }
    }
    #[must_use]
    pub const fn success(self) -> bool {
        matches!(self, Self::Code(0))
    }
}
pub(crate) fn native(value: crate::ffi::EngineExit) -> Result<Exit, Error> {
    if value.abi != 4 || value.size != 24 {
        return Err(Error::ResultProtocol("invalid native exit layout".into()));
    }
    match value.kind {
        1 => Ok(Exit::Code(value.guest_status)),
        2 => Ok(Exit::Signal(value.guest_status)),
        3 => Ok(Exit::Fault {
            status: value.guest_status,
            detail: value.detail,
        }),
        4 => Err(Error::Engine {
            status: value.guest_status,
            detail: value.detail,
        }),
        kind => Err(Error::ResultProtocol(format!(
            "invalid native exit kind {kind}"
        ))),
    }
}