pty2 0.1.0

Fork with new pseudo-terminal (PTY)
Documentation 
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use ::descriptor::DescriptorError;
use std::error::Error;
use std::fmt;

/// The alias `Result` learns `SlaveError` possibility.

pub type Result<T> = ::std::result::Result<T, SlaveError>;

/// The enum `SlaveError` defines the possible errors from constructor Slave.
#[derive(Clone, Copy, Debug)]
pub enum SlaveError {
    BadDescriptor(DescriptorError),
    Dup2Error,
}

impl fmt::Display for SlaveError {
    /// The function `fmt` formats the value using the given formatter.

    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", ::errno::errno())
    }
}

impl Error for SlaveError {
    /// The function `description` returns a short description of the error.

    fn description(&self) -> &str {
        match *self {
            SlaveError::BadDescriptor(_) => "the descriptor as occured an error",
            SlaveError::Dup2Error => "the `dup2` has a error, errno isset appropriately.",
        }
    }

    /// The function `cause` returns the lower-level cause of this error, if any.

    fn cause(&self) -> Option<&Error> {
        match *self {
            SlaveError::BadDescriptor(ref err) => Some(err),
            _ => None,
        }
    }
}