/
process_utils.go
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/
process_utils.go
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// Copyright 2017 Istio 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 util
import (
"fmt"
"log"
"os"
"strconv"
"syscall"
)
// IsProcessRunning check if a os.Process is running
func IsProcessRunning(p *os.Process) (bool, error) {
if p == nil {
return false, nil
}
err := p.Signal(syscall.Signal(0))
if err == nil {
return true, nil
}
return false, fmt.Errorf("process %d is not alive or not belongs to you %v", p.Pid, err)
}
// IsProcessRunningInt check if a process of the given pid(int) is running
func IsProcessRunningInt(pid int) (bool, error) {
process, err := os.FindProcess(pid)
if err != nil {
return false, fmt.Errorf("failed to find process %d: %v (check os.FindProcess)", pid, err)
}
return IsProcessRunning(process)
}
// IsProcessRunningString check if a process of the given pid(string) is running
func IsProcessRunningString(pidS string) (bool, error) {
pid, err := strconv.Atoi(pidS)
if err != nil {
return false, fmt.Errorf("can't covert %s to int: %v", pidS, err)
}
return IsProcessRunningInt(pid)
}
// KillProcess kill a os.Process
func KillProcess(p *os.Process) (err error) {
var alive bool
if alive, err = IsProcessRunning(p); !alive {
log.Printf("Skip stop process %d: %v", p.Pid, err)
return nil
}
if err = p.Kill(); err != nil {
return fmt.Errorf("failed to kill process %d: %v", p.Pid, err)
}
if err = p.Release(); err != nil {
return fmt.Errorf("failed to release resource of process %d: %v", p.Pid, err)
}
return nil
}