#message #identifier #error #errno #protocols #operation


errno codes with messages from various OSes and architectures

1 unstable release

Uses old Rust 2015

0.1.0 May 26, 2018

#11 in #errno

Used in errno-codes-tool



Build Status crates.io MIT/Apache 2.0


Rust library for dealing with errno codes sent over the network from different operation systems and/or CPU architectures.

Documentation on docs.rs


errno is a standard way for handling errors in many standard libraries of many operating systems. Unfortunately, very few errno constant identifiers are standardized, and a lot of errno values with the same meaning use different numeric constants across different OSes.

On Linux, some CPU architectures may define their own numeric constants (see $KERNEL_SRC/arch/$ARCH/include/uapi/asm/errno.h), different from common values used by the most of other architectures (see $KERNEL_SRC/include/uapi/asm-generic/errno*.h). It looks like this was done for source-level compatibility with proprietary Unixes for these CPU architectures.

Despite compatibility complications, raw errno codes are sometimes used in network protocols. This library simplifies working with such protocols.

Known errno codes

Source code with constants and mappings generate automatically based on header files from following OSes:

  • Linux, all architectures known by kernel 4.16
  • Windows (MinGW)


Add this to your Cargo.toml:

errno-codes = "0.1"

See examples/ directory and crate errno-codes-tool for usage examples.


~28K SLoC