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//! Error types and utilities.

use failure;

/// The result type used by this library.
pub type Result<T> = ::std::result::Result<T, failure::Error>;

/// A collection of possible errors.
#[derive(Debug, Fail)]
pub enum Error {
    /// The supplied address is null.
    #[fail(display = "address must not be null")]
    Null,
    /// The queried memory is free.
    #[fail(display = "address does not contain allocated memory")]
    Free,
    /// Invalid procfs input.
    #[fail(display = "invalid procfs source input")]
    ProcfsInput,
    /// A proc fs IO operation failed.
    #[fail(display = "{}", _0)]
    ProcfsIo(#[cause] ::std::io::Error),
    /// A system call failed.
    #[fail(display = "system call failed with: {}", _0)]
    SystemCall(::errno::Errno),
    /// A macOS kernel call failed
    #[fail(display = "macOS kernel call failed with: {}", _0)]
    MachRegion(::libc::c_int),
}