Demonstrate potential memory leak in fsnotify.

memleak.go

package main
import (
  "log"
  "os"
  "github.com/howeyc/fsnotify"
  "runtime"
)
 
func main() {
  c := make(chan int)
 
  if len(os.Args) < 2 {
    log.Fatal("no arguments")
  }
 
  n, err := fsnotify.NewWatcher()
  if err != nil {
    log.Fatal(err)
  }
 
  go func() {
    var m runtime.MemStats
    for {
      select {
      case ev := <-n.Event:
        // log.Println("event:", ev)
        if ev.IsCreate() {
          // log.Println("removing", ev.Name)
          err = os.Remove(ev.Name)
          if err != nil {
            log.Println("remove failed:", err)
          }
        }
        ev = nil
      case err := <-n.Error:
        log.Println("error:", err)
        err = nil
      }
      runtime.GC()
      runtime.ReadMemStats(&m)
      log.Println(m.Alloc, m.TotalAlloc, m.Sys, m.Mallocs, m.Frees)
    }
  }()
 
  for _, s := range os.Args[1:] {
    err = n.WatchFlags(s, fsnotify.FSN_CREATE)
    if err != nil {
      log.Fatal(err)
    }
  }
 
  <-c // wait forever
}