blob: 8fae706adbe24d3a272f1482f2e1e8b080f837ea (
plain)
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
|
// Copyright 2015 Matthew Holt and The Caddy Authors
//
// 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 caddy
import (
"log"
"os"
"os/signal"
)
// TrapSignals create signal/interrupt handlers as best it can for the
// current OS. This is a rather invasive function to call in a Go program
// that captures signals already, so in that case it would be better to
// implement these handlers yourself.
func TrapSignals() {
trapSignalsCrossPlatform()
trapSignalsPosix()
}
// trapSignalsCrossPlatform captures SIGINT or interrupt (depending
// on the OS), which initiates a graceful shutdown. A second SIGINT
// or interrupt will forcefully exit the process immediately.
func trapSignalsCrossPlatform() {
go func() {
shutdown := make(chan os.Signal, 1)
signal.Notify(shutdown, os.Interrupt)
for i := 0; true; i++ {
<-shutdown
if i > 0 {
log.Println("[INFO] SIGINT: Force quit")
os.Exit(ExitCodeForceQuit)
}
log.Println("[INFO] SIGINT: Shutting down")
go gracefulStop("SIGINT")
}
}()
}
// gracefulStop exits the process as gracefully as possible.
func gracefulStop(sigName string) {
exitCode := ExitCodeSuccess
err := stopAndCleanup()
if err != nil {
log.Printf("[ERROR] %s stop: %v", sigName, err)
exitCode = ExitCodeFailedQuit
}
log.Printf("[INFO] %s: Shutdown done", sigName)
os.Exit(exitCode)
}
// Exit codes. Generally, you will want to avoid
// automatically restarting the process if the
// exit code is 1.
const (
ExitCodeSuccess = iota
ExitCodeFailedStartup
ExitCodeForceQuit
ExitCodeFailedQuit
)
|
