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Last update: 06/04/2026

errno

:boom: Cross-platform interface to the `errno` variable

Latest version: 0.3.14 registry icon
Maintenance score
54
Safety score
100
Popularity score
77
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Security
  Vulnerabilities
Version Suggest Low Medium High Critical
0.3.14 0 0 0 0 0
0.3.13 0 0 0 0 0
0.3.12 0 0 0 0 0
0.3.11 0 0 0 0 0
0.3.10 0 0 0 0 0
0.3.9 0 0 0 0 0
0.3.8 0 0 0 0 0
0.3.7 0 0 0 0 0
0.3.6 0 0 0 0 0
0.3.5 0 0 0 0 0
0.3.4 0 0 0 0 0
0.3.3 0 0 0 0 0
0.3.2 0 0 0 0 0
0.3.1 0 0 0 0 0
0.3.0 0 0 0 0 0
0.2.8 0 0 0 0 0
0.2.7 0 0 0 0 0
0.2.6 0 0 0 0 0
0.2.5 0 0 0 0 0
0.2.4 0 0 0 0 0
0.2.3 0 0 0 0 0
0.2.2 0 0 0 0 0
0.2.1 0 0 0 0 0
0.2.0 0 0 0 0 0
0.1.8 0 0 0 0 0
0.1.7 0 0 0 0 0
0.1.6 0 0 0 0 0
0.1.5 0 0 0 0 0
0.1.4 0 0 0 0 0
0.1.3 0 0 0 0 0
0.1.2 0 0 0 0 0
0.1.1 0 0 0 0 0
0.1.0 0 0 0 0 0

Stability
Latest release:

0.3.14 - This version is safe to use because it has no known security vulnerabilities at this time. Find out if your coding project uses this component and get notified of any reported security vulnerabilities with Meterian-X Open Source Security Platform

Licensing

Maintain your licence declarations and avoid unwanted licences to protect your IP the way you intended.

Apache-2.0   -   Apache License 2.0

Not a wildcard

Not proprietary

OSI Compliant

MIT   -   MIT License

Not a wildcard

Not proprietary

OSI Compliant

errno CI Cargo

Cross-platform interface to the errno variable. Works on Rust 1.56 or newer.

Documentation is available at https://docs.rs/errno.

Dependency

Add to your Cargo.toml:

[dependencies]
errno = "0.3"

Comparison with std::io::Error

The standard library provides Error::last_os_error which fetches errno in the same way.

This crate provides these extra features:

  • No heap allocations
  • Optional #![no_std] support
  • A set_errno function

Examples

extern crate errno;
use errno::{Errno, errno, set_errno};

// Get the current value of errno
let e = errno();

// Set the current value of errno
set_errno(e);

// Extract the error code as an i32
let code = e.0;

// Display a human-friendly error message
println!("Error {}: {}", code, e);

#![no_std]

Enable #![no_std] support by disabling the default std feature:

[dependencies]
errno = { version = "0.3", default-features = false }

The Error impl will be unavailable.