winio

README

go-winio

This repository contains utilities for efficiently performing Win32 IO operations in Go. Currently, this is focused on accessing named pipes and other file handles, and for using named pipes as a net transport.

This code relies on IO completion ports to avoid blocking IO on system threads, allowing Go to reuse the thread to schedule another goroutine. This limits support to Windows Vista and newer operating systems. This is similar to the implementation of network sockets in Go's net package.

Please see the LICENSE file for licensing information.

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit Microsoft CLA.

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

Additionally, the pull request pipeline requires the following steps to be performed before mergining.

Code Sign-Off

We require that contributors sign their commits using git commit --signoff to certify they either authored the work themselves or otherwise have permission to use it in this project.

A range of commits can be signed off using git rebase --signoff.

Please see the developer certificate for more info, as well as to make sure that you can attest to the rules listed. Our CI uses the DCO Github app to ensure that all commits in a given PR are signed-off.

Linting

Code must pass a linting stage, which uses golangci-lint. The linting settings are stored in .golangci.yaml, and can be run automatically with VSCode by adding the following to your workspace or folder settings:

    "go.lintTool": "golangci-lint",
    "go.lintOnSave": "package",

Additional editor integrations options are also available.

Alternatively, golangci-lint can be installed locally and run from the repo root:

# use . or specify a path to only lint a package
# to show all lint errors, use flags "--max-issues-per-linter=0 --max-same-issues=0"
> golangci-lint run ./...

Go Generate

The pipeline checks that auto-generated code, via go generate, are up to date.

This can be done for the entire repo:

> go generate ./...

Code of Conduct

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Special Thanks

Thanks to natefinch for the inspiration for this library. See npipe for another named pipe implementation.

Documentation

Overview

This package provides utilities for efficiently performing Win32 IO operations in Go. Currently, this package is provides support for genreal IO and management of

• named pipes
• files
• Hyper-V sockets

This code is similar to Go's net package, and uses IO completion ports to avoid blocking IO on system threads, allowing Go to reuse the thread to schedule other goroutines.

This limits support to Windows Vista and newer operating systems.

Additionally, this package provides support for:

• creating and managing GUIDs
• writing to ETW
• opening and manageing VHDs
• parsing Windows Image files
• auto-generating Win32 API code

Index

• func EncodeExtendedAttributes(eas []ExtendedAttribute) ([]byte, error)
• type ExtendedAttribute
  • func DecodeExtendedAttributes(b []byte) (eas []ExtendedAttribute, err error)

Functions

func EncodeExtendedAttributes

func EncodeExtendedAttributes(eas []ExtendedAttribute) ([]byte, error)

EncodeExtendedAttributes encodes a list of EAs into a FILE_FULL_EA_INFORMATION buffer for use with BackupWrite, ZwSetEaFile, etc.

Types

type ExtendedAttribute

type ExtendedAttribute struct {
	Name  string
	Value []byte
	Flags uint8
}

ExtendedAttribute represents a single Windows EA.

func DecodeExtendedAttributes

func DecodeExtendedAttributes(b []byte) (eas []ExtendedAttribute, err error)

DecodeExtendedAttributes decodes a list of EAs from a FILE_FULL_EA_INFORMATION buffer retrieved from BackupRead, ZwQueryEaFile, etc.