blob: f13625aee7907dcd1e110ae32d344325b2c77bf4 [file] [log] [blame]
use crate::platform;
use std::fmt;
/// Ctrl-C error.
#[derive(Debug)]
pub enum Error {
/// Signal could not be found from the system.
NoSuchSignal(crate::SignalType),
/// Ctrl-C signal handler already registered.
MultipleHandlers,
/// Unexpected system error.
System(std::io::Error),
}
impl Error {
fn describe(&self) -> &str {
match *self {
Error::NoSuchSignal(_) => "Signal could not be found from the system",
Error::MultipleHandlers => "Ctrl-C signal handler already registered",
Error::System(_) => "Unexpected system error",
}
}
}
impl From<platform::Error> for Error {
fn from(e: platform::Error) -> Error {
#[cfg(not(windows))]
if e == platform::Error::EEXIST {
return Error::MultipleHandlers;
}
let system_error = std::io::Error::new(std::io::ErrorKind::Other, e);
Error::System(system_error)
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Ctrl-C error: {}", self.describe())
}
}
impl std::error::Error for Error {
fn description(&self) -> &str {
self.describe()
}
fn cause(&self) -> Option<&dyn std::error::Error> {
match *self {
Error::System(ref e) => Some(e),
_ => None,
}
}
}