| 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, |
| } |
| } |
| } |