mirror of
https://github.com/minio/minio.git
synced 2025-11-04 10:11:09 +01:00
8d98662633
Implementation overview: https://gist.github.com/klauspost/1801c858d5e0df391114436fdad6987b
75 lines
2.3 KiB
Go
75 lines
2.3 KiB
Go
/*
|
|
* MinIO Cloud Storage, (C) 2016 MinIO, Inc.
|
|
*
|
|
* 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 cmd
|
|
|
|
import (
|
|
"context"
|
|
"os"
|
|
"os/exec"
|
|
"syscall"
|
|
)
|
|
|
|
// Type of service signals currently supported.
|
|
type serviceSignal int
|
|
|
|
const (
|
|
serviceRestart serviceSignal = iota // Restarts the server.
|
|
serviceStop // Stops the server.
|
|
// Add new service requests here.
|
|
)
|
|
|
|
// Global service signal channel.
|
|
var globalServiceSignalCh chan serviceSignal
|
|
|
|
// GlobalServiceDoneCh - Global service done channel.
|
|
var GlobalServiceDoneCh <-chan struct{}
|
|
|
|
// GlobalContext context that is canceled when server is requested to shut down.
|
|
var GlobalContext context.Context
|
|
|
|
// cancelGlobalContext can be used to indicate server shutdown.
|
|
var cancelGlobalContext context.CancelFunc
|
|
|
|
// Initialize service mutex once.
|
|
func init() {
|
|
initGlobalContext()
|
|
}
|
|
|
|
func initGlobalContext() {
|
|
GlobalContext, cancelGlobalContext = context.WithCancel(context.Background())
|
|
GlobalServiceDoneCh = GlobalContext.Done()
|
|
globalServiceSignalCh = make(chan serviceSignal)
|
|
}
|
|
|
|
// restartProcess starts a new process passing it the active fd's. It
|
|
// doesn't fork, but starts a new process using the same environment and
|
|
// arguments as when it was originally started. This allows for a newly
|
|
// deployed binary to be started. It returns the pid of the newly started
|
|
// process when successful.
|
|
func restartProcess() error {
|
|
// Use the original binary location. This works with symlinks such that if
|
|
// the file it points to has been changed we will use the updated symlink.
|
|
argv0, err := exec.LookPath(os.Args[0])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Invokes the execve system call.
|
|
// Re-uses the same pid. This preserves the pid over multiple server-respawns.
|
|
return syscall.Exec(argv0, os.Args, os.Environ())
|
|
}
|