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https://github.com/KusakabeShi/EtherGuard-VPN.git
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85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
// Copyright 2014 Docker, Inc.
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// Copyright 2015-2018 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Package daemon provides a Go implementation of the sd_notify protocol.
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// It can be used to inform systemd of service start-up completion, watchdog
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// events, and other status changes.
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//
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// https://www.freedesktop.org/software/systemd/man/sd_notify.html#Description
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package mtypes
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import (
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"net"
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"os"
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)
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const (
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// SdNotifyReady tells the service manager that service startup is finished
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// or the service finished loading its configuration.
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SdNotifyReady = "READY=1"
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// SdNotifyStopping tells the service manager that the service is beginning
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// its shutdown.
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SdNotifyStopping = "STOPPING=1"
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// SdNotifyReloading tells the service manager that this service is
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// reloading its configuration. Note that you must call SdNotifyReady when
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// it completed reloading.
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SdNotifyReloading = "RELOADING=1"
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// SdNotifyWatchdog tells the service manager to update the watchdog
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// timestamp for the service.
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SdNotifyWatchdog = "WATCHDOG=1"
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)
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// SdNotify sends a message to the init daemon. It is common to ignore the error.
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// If `unsetEnvironment` is true, the environment variable `NOTIFY_SOCKET`
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// will be unconditionally unset.
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//
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// It returns one of the following:
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// (false, nil) - notification not supported (i.e. NOTIFY_SOCKET is unset)
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// (false, err) - notification supported, but failure happened (e.g. error connecting to NOTIFY_SOCKET or while sending data)
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// (true, nil) - notification supported, data has been sent
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func SdNotify(unsetEnvironment bool, state string) (bool, error) {
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socketAddr := &net.UnixAddr{
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Name: os.Getenv("NOTIFY_SOCKET"),
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Net: "unixgram",
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}
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// NOTIFY_SOCKET not set
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if socketAddr.Name == "" {
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return false, nil
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}
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if unsetEnvironment {
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if err := os.Unsetenv("NOTIFY_SOCKET"); err != nil {
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return false, err
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}
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}
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conn, err := net.DialUnix(socketAddr.Net, nil, socketAddr)
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// Error connecting to NOTIFY_SOCKET
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if err != nil {
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return false, err
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}
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defer conn.Close()
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if _, err = conn.Write([]byte(state)); err != nil {
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return false, err
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}
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return true, nil
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}
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