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|
package inutil
import (
"inotify"
"os"
"syscall"
)
const (
// Flags for the parameter of InotifyInit1().
// These, oddly, appear to be 24-bit numbers.
IN_CLOEXEC = inotify.IN_CLOEXEC
)
type Watcher struct {
Events <-chan inotify.Event
events chan<- inotify.Event
Errors <-chan error
errors chan<- error
in *inotify.Inotify
}
func WatcherInit() (*Watcher, error) {
in, err := inotify.InotifyInit()
return newWatcher(in, err)
}
func WatcherInit1(flags int) (*Watcher, error) {
in, err := inotify.InotifyInit1(flags &^ inotify.IN_NONBLOCK)
return newWatcher(in, err)
}
func newWatcher(in *inotify.Inotify, err error) (*Watcher, error) {
events := make(chan inotify.Event)
errors := make(chan error)
o := &Watcher{
Events: events,
events: events,
Errors: errors,
errors: errors,
in: in,
}
go o.worker()
return o, err
}
func (o *Watcher) AddWatch(path string, mask inotify.Mask) (inotify.Wd, error) {
return o.in.AddWatch(path, mask)
}
func (o *Watcher) RmWatch(wd inotify.Wd) error {
return o.in.RmWatch(wd)
}
func (o *Watcher) Close() {
func() {
defer recover()
close(o.events)
close(o.errors)
}()
go o.in.Close()
}
func (o *Watcher) worker() {
defer recover()
for {
ev, err := o.in.Read()
if ev.Wd >= 0 {
o.events <- ev
}
if err != nil {
if err.(*os.SyscallError).Err == syscall.EBADF {
o.Close()
}
o.errors <- err
}
}
}
|
