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//! Listener hand-off between processes.
//!
//! The functions arrive in `0.4.0` (Unix) and `0.5.0` (Windows); the error type
//! exists in every build.
use std::fmt;
use std::io;
/// Why a listener hand-off failed. Nothing is adopted on any error.
///
/// ```
/// assert_eq!(net_io::HandoffError::BadChecksum.to_string(), "the hand-off manifest checksum does not match");
/// ```
#[non_exhaustive]
#[derive(Debug)]
pub enum HandoffError {
/// The sender is not the expected process or user.
PeerMismatch,
/// The control message was truncated.
Truncated,
/// The descriptor count does not match the manifest.
CountMismatch,
/// The manifest does not start with the expected magic.
BadMagic,
/// The manifest version is unknown.
BadVersion,
/// The manifest checksum does not match.
BadChecksum,
/// More listeners than one hand-off carries.
TooMany {
/// The maximum.
max: u8,
},
/// A received socket failed verification.
VerifyFailed {
/// Its position in the manifest.
index: u8,
/// Which check failed.
why: &'static str,
},
/// The hand-off did not finish in time.
Timeout,
/// An OS call failed.
Os(io::Error),
}
impl fmt::Display for HandoffError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
HandoffError::PeerMismatch => {
f.write_str("the hand-off sender is not the expected process or user")
}
HandoffError::Truncated => f.write_str("the hand-off message was truncated"),
HandoffError::CountMismatch => {
f.write_str("the descriptor count does not match the manifest")
}
HandoffError::BadMagic => f.write_str("not a hand-off manifest"),
HandoffError::BadVersion => f.write_str("unknown hand-off manifest version"),
HandoffError::BadChecksum => {
f.write_str("the hand-off manifest checksum does not match")
}
HandoffError::TooMany { max } => write!(f, "more than {max} listeners in one hand-off"),
HandoffError::VerifyFailed { index, why } => {
write!(f, "received listener {index} failed: {why}")
}
HandoffError::Timeout => f.write_str("the hand-off did not finish in time"),
HandoffError::Os(e) => write!(f, "{e}"),
}
}
}
impl std::error::Error for HandoffError {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
HandoffError::Os(e) => Some(e),
_ => None,
}
}
}