68 lines
2.3 KiB
Go
68 lines
2.3 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
|
|
//
|
|
// This file is part of MinIO Object Storage stack
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
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.
|
|
serviceReloadDynamic // Reload dynamic config values.
|
|
// Add new service requests here.
|
|
)
|
|
|
|
// Global service signal channel.
|
|
var globalServiceSignalCh chan serviceSignal
|
|
|
|
// 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
|
|
|
|
func initGlobalContext() {
|
|
GlobalContext, cancelGlobalContext = context.WithCancel(context.Background())
|
|
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())
|
|
}
|