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// Copyright 2015 Luke Shumaker <lukeshu@sbcglobal.net>.
//
// This is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of
// the License, or (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this manual; if not, see
// <http://www.gnu.org/licenses/>.
package inotify
import (
"os"
"syscall"
)
// A Watcher is a wrapper around an (*Inotify) that exposes a
// channel-based interface that is much nicer to work with.
type Watcher struct {
Events <-chan Event
Errors <-chan error
events chan<- Event
errors chan<- error
in *Inotify
}
// Wraps InotifyInit()
func WatcherInit() (*Watcher, error) {
in, err := InotifyInit()
return newWatcher(in, err)
}
// Wraps InotifyInit1()
func WatcherInit1(flags int) (*Watcher, error) {
in, err := InotifyInit1(flags &^ IN_NONBLOCK)
return newWatcher(in, err)
}
func newWatcher(in *Inotify, err error) (*Watcher, error) {
events := make(chan Event)
errors := make(chan error)
o := &Watcher{
Events: events,
events: events,
Errors: errors,
errors: errors,
in: in,
}
go o.worker()
return o, err
}
// Wraps Inotify.AddWatch(); adds or modifies a watch.
func (o *Watcher) AddWatch(path string, mask Mask) (Wd, error) {
return o.in.AddWatch(path, mask)
}
// Wraps Inotify.RmWatch(); removes a watch.
func (o *Watcher) RmWatch(wd Wd) error {
return o.in.RmWatch(wd)
}
// Wraps Inotify.Close(). Unlike Inotify.Close(),
// this cannot block. Also unlike Inotify.Close(), nothing
// may be received from the channel after this is called.
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
}
}
}
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