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// +build linux
package udev
import (
"context"
"fmt"
"runtime"
"sync"
"testing"
"time"
)
func ExampleMonitor() {
// Create Udev and Monitor
u := Udev{}
m := u.NewMonitorFromNetlink("udev")
// Add filters to monitor
m.FilterAddMatchSubsystemDevtype("block", "disk")
m.FilterAddMatchTag("systemd")
// Create a context
ctx, cancel := context.WithCancel(context.Background())
// Start monitor goroutine and get receive channel
ch, _ := m.DeviceChan(ctx)
// WaitGroup for timers
var wg sync.WaitGroup
wg.Add(3)
go func() {
fmt.Println("Started listening on channel")
for d := range ch {
fmt.Println("Event:", d.Syspath(), d.Action())
}
fmt.Println("Channel closed")
wg.Done()
}()
go func() {
fmt.Println("Starting timer to update filter")
<-time.After(2 * time.Second)
fmt.Println("Removing filter")
m.FilterRemove()
fmt.Println("Updating filter")
m.FilterUpdate()
wg.Done()
}()
go func() {
fmt.Println("Starting timer to signal done")
<-time.After(4 * time.Second)
fmt.Println("Signalling done")
cancel()
wg.Done()
}()
wg.Wait()
}
func TestMonitorDeviceChan(t *testing.T) {
u := Udev{}
m := u.NewMonitorFromNetlink("udev")
m.FilterAddMatchSubsystemDevtype("block", "disk")
m.FilterAddMatchTag("systemd")
ctx, cancel := context.WithCancel(context.Background())
ch, e := m.DeviceChan(ctx)
if e != nil {
t.Fail()
}
var wg sync.WaitGroup
wg.Add(3)
go func() {
fmt.Println("Started listening on channel")
for d := range ch {
fmt.Println(d.Syspath(), d.Action())
}
fmt.Println("Channel closed")
wg.Done()
}()
go func() {
fmt.Println("Starting timer to update filter")
<-time.After(2 * time.Second)
fmt.Println("Removing filter")
m.FilterRemove()
fmt.Println("Updating filter")
m.FilterUpdate()
wg.Done()
}()
go func() {
fmt.Println("Starting timer to signal done")
<-time.After(4 * time.Second)
fmt.Println("Signalling done")
cancel()
wg.Done()
}()
wg.Wait()
}
func TestMonitorGC(t *testing.T) {
runtime.GC()
}
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