зеркало из https://github.com/github/vitess-gh.git
62 строки
1.4 KiB
Go
62 строки
1.4 KiB
Go
/*
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Copyright 2019 The Vitess Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 servenv
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import (
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"flag"
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"fmt"
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"os"
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"vitess.io/vitess/go/vt/log"
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)
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var pidFile = flag.String("pid_file", "", "If set, the process will write its pid to the named file, and delete it on graceful shutdown.")
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func init() {
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pidFileCreated := false
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// Create pid file after flags are parsed.
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OnInit(func() {
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if *pidFile == "" {
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return
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}
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file, err := os.OpenFile(*pidFile, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
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if err != nil {
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log.Errorf("Unable to create pid file '%s': %v", *pidFile, err)
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return
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}
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pidFileCreated = true
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fmt.Fprintln(file, os.Getpid())
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file.Close()
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})
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// Remove pid file on graceful shutdown.
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OnClose(func() {
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if *pidFile == "" {
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return
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}
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if !pidFileCreated {
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return
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}
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if err := os.Remove(*pidFile); err != nil {
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log.Errorf("Unable to remove pid file '%s': %v", *pidFile, err)
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}
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})
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}
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