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package main
// Watches for changes to a directory. Works cross-platform
import (
"github.com/fsnotify/fsnotify"
)
// This would be a really dumb way to watch for new network interfaces
// since it then watches a linux only directory /sys/class/net for changes
func watchSysClassNet() {
// Create new watcher.
watcher, err := fsnotify.NewWatcher()
if err != nil {
log(logError, "watchSysClassNet() failed:", err)
return
}
defer watcher.Close()
// Start listening for events.
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
log("event:", event)
if event.Has(fsnotify.Write) {
log("modified file:", event.Name)
}
case err, ok := <-watcher.Errors:
if !ok {
return
}
log("error:", err)
}
}
}()
// Add a path.
err = watcher.Add("/tmp")
if err != nil {
log(logError, "watchSysClassNet() watcher.Add() failed:", err)
return
}
// Block main goroutine forever.
<-make(chan struct{})
}
func fsnotifyNetworkInterfaceChanges() error {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return err
}
defer watcher.Close()
// Watch for network interface changes
err = watcher.Add("/sys/class/net")
if err != nil {
return err
}
for {
select {
case event := <-watcher.Events:
log("fsnotifyNetworkInterfaceChanges() event =", event)
if event.Op&fsnotify.Create == fsnotify.Create {
// Do something on network interface creation
}
case err := <-watcher.Errors:
log("fsnotifyNetworkInterfaceChanges() event err =", err)
return err
}
}
}
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