uevent's Introduction

Golang uevent bindings

This golang library implements uevent bindings for reading and decoding Linux kernel udev events.

Usage

package main

import (
	"fmt"
	"log"

	"github.com/s-urbaniak/uevent"
)

func main() {
	r, err := uevent.NewReader()
	if err != nil {
		log.Fatal(err)
	}

	dec := uevent.NewDecoder(r)

	for {
		evt, err := dec.Decode()
		if err != nil {
			log.Fatal(err)
		}
		fmt.Println(evt)
	}
}

Prerequisites

Linux

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uevent's Issues

Please add missing license file

The Apache 2 license is a good choice, or the BSD-style license that Go itself is released under (https://golang.org/LICENSE).

Thank you for the useful package!

Provide a way to shutdown the udev loop gracefully

The project documentation shows a way to use uevent library as:

dec := uevent.NewDecoder(r)

for {
    evt, err := dec.Decode()
    if err != nil {
	log.Fatal(err)
    }
    fmt.Println(evt)
}

I have an app with a goroutine that does this loop. Now I need to stop my application and shutdown the loop. Unfortunately there is no way to do it gracefully. I can do uevent.Close() in another goroutine but it is racy and causes a panic in bufio.Reader (see anatol/booster#22):

panic: bufio: reader returned negative count from Read

goroutine 6 [running]:
bufio.(*Reader).fill(0xc000070f68)
	/usr/lib/go/src/bufio/bufio.go:103 +0x1dd
bufio.(*Reader).ReadSlice(0xc000070f68, 0x0, 0xc, 0x7f6718544c28, 0xc0003c42f0, 0x0, 0xab0fc0)
	/usr/lib/go/src/bufio/bufio.go:360 +0x3d
bufio.(*Reader).collectFragments(0xc000070f68, 0xc000070d00, 0x40d610, 0xc00006b440, 0x30, 0x30, 0x823120, 0xc00005c960, 0x60, 0x7f671854e308, ...)
	/usr/lib/go/src/bufio/bufio.go:435 +0x7a
bufio.(*Reader).ReadString(0xc000070f68, 0xc00005c900, 0x7, 0x0, 0xc00011a9d8, 0x0)
	/usr/lib/go/src/bufio/bufio.go:483 +0x4c
github.com/s-urbaniak/uevent.(*Decoder).next(...)
	/home/anatol/go/pkg/mod/github.com/s-urbaniak/[email protected]/decoder.go:81
github.com/s-urbaniak/uevent.(*Decoder).Decode(0xc000070ed0, 0xc00006b3e0, 0x83cf0f, 0x7)
	/home/anatol/go/pkg/mod/github.com/s-urbaniak/[email protected]/decoder.go:42 +0x75
main.udevListener()
	/mnt/cold/sources/golang/booster/init/main.go:454 +0x185
created by main.boost
	/mnt/cold/sources/golang/booster/init/main.go:782 +0x4bd

Please provide a way to shutdown the uevent loop gracefully.

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