76 lines
2.0 KiB
Rust
76 lines
2.0 KiB
Rust
// Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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use std::{
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convert::{From, TryInto},
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fmt::{
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Display, {self},
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},
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io, result,
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};
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use serde::{Deserialize, Serialize};
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use thiserror::Error;
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/// A system error
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/// In Unix systems, retrieved from errno (man 3 errno), set by a libc
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/// function that returned an error.
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/// On Windows, retrieved from GetLastError, set by a Windows function
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/// that returned an error
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#[derive(Error, Serialize, Deserialize, Clone, Copy, Debug, PartialEq)]
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#[serde(transparent)]
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pub struct Error(i32);
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pub type Result<T> = result::Result<T, Error>;
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impl Error {
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/// Constructs a new error with the given error number.
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pub fn new<T: TryInto<i32>>(e: T) -> Error {
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// A value outside the bounds of an i32 will never be a valid
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// errno/GetLastError
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Error(e.try_into().unwrap_or_default())
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}
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/// Constructs an Error from the most recent system error.
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///
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/// The result of this only has any meaning just after a libc/Windows call that returned
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/// a value indicating errno was set.
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pub fn last() -> Error {
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Error(io::Error::last_os_error().raw_os_error().unwrap())
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}
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/// Gets the errno for this error
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pub fn errno(self) -> i32 {
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self.0
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}
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}
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impl From<io::Error> for Error {
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fn from(e: io::Error) -> Self {
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Error(e.raw_os_error().unwrap_or_default())
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}
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}
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impl From<Error> for io::Error {
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fn from(e: Error) -> io::Error {
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io::Error::from_raw_os_error(e.0)
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}
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}
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impl From<Error> for Box<dyn std::error::Error + Send> {
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fn from(e: Error) -> Self {
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Box::new(e)
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}
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}
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impl Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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Into::<io::Error>::into(*self).fmt(f)
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}
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}
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/// Returns the last errno as a Result that is always an error.
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pub fn errno_result<T>() -> Result<T> {
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Err(Error::last())
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}
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