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// Copyright (C) 2016 Luke Shumaker <lukeshu@sbcglobal.net>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sd_login
import (
"git.lukeshu.com/go/libgnulinux/inotify"
"golang.org/x/sys/unix"
)
// Monitor monitors several types of events, so you don't have to do
// busy-polling.
//
// However, Monitor won't actually give you the event that happened,
// you'll need to read it yourself.
type Monitor struct {
in *inotify.Inotify
}
type MonitorCategory uint
const (
MonitorSeats MonitorCategory = 1 << iota
MonitorSessions
MonitorUsers
MonitorMachines
MonitorAll = MonitorSeats | MonitorSessions | MonitorUsers | MonitorMachines
)
func NewMonitor(categories MonitorCategory) (*Monitor, error) {
if categories == 0 {
return nil, unix.EINVAL
}
in, err := inotify.InotifyInit1(inotify.IN_CLOEXEC)
if err != nil {
return nil, err
}
if categories&MonitorSeats != 0 {
_, err := in.AddWatch("/run/systemd/seats/", inotify.IN_MOVED_TO|inotify.IN_DELETE)
if err != nil {
in.Close()
return nil, err
}
}
if categories&MonitorSessions != 0 {
_, err := in.AddWatch("/run/systemd/sessions/", inotify.IN_MOVED_TO|inotify.IN_DELETE)
if err != nil {
in.Close()
return nil, err
}
}
if categories&MonitorUsers != 0 {
_, err := in.AddWatch("/run/systemd/users/", inotify.IN_MOVED_TO|inotify.IN_DELETE)
if err != nil {
in.Close()
return nil, err
}
}
if categories&MonitorMachines != 0 {
_, err := in.AddWatch("/run/systemd/machines/", inotify.IN_MOVED_TO|inotify.IN_DELETE)
if err != nil {
in.Close()
return nil, err
}
}
return &Monitor{in: in}, nil
}
func (m *Monitor) Close() error {
return m.in.Close()
}
func (m *Monitor) Flush() error {
for {
ev, err := m.in.ReadNonblock()
if err != nil {
return err
}
if ev.Wd < 0 {
return nil
}
}
}
func (m *Monitor) Wait() error {
_, err := m.in.ReadBlock()
return err
}
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