1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
// 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 inutil provides a channel-based interface to inotify.
package inutil
import (
"inotify"
"os"
"syscall"
)
type Watcher struct {
Events <-chan inotify.Event
Errors <-chan error
events chan<- inotify.Event
errors chan<- error
in *inotify.Inotify
}
// Wraps inotify.InotifyInit()
func WatcherInit() (*Watcher, error) {
in, err := inotify.InotifyInit()
return newWatcher(in, err)
}
// Wraps inotify.InotifyInit1()
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
}
// Wraps inotify.Inotify.AddWatch(); adds or modifies a watch.
func (o *Watcher) AddWatch(path string, mask inotify.Mask) (inotify.Wd, error) {
return o.in.AddWatch(path, mask)
}
// Wraps inotify.Inotify.RmWatch(); removes a watch.
func (o *Watcher) RmWatch(wd inotify.Wd) error {
return o.in.RmWatch(wd)
}
// Wraps inotify.Inotify.Close(). Unlike inotify.Inotify.Close(),
// this cannot block. Also unlike inotify.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
}
}
}
|
