/
pid.go
105 lines (77 loc) · 2.3 KB
/
pid.go
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// Package pid provides methods for working with PID files
package pid
// ////////////////////////////////////////////////////////////////////////////////// //
// //
// Copyright (c) 2024 ESSENTIAL KAOS //
// Apache License, Version 2.0 <https://www.apache.org/licenses/LICENSE-2.0> //
// //
// ////////////////////////////////////////////////////////////////////////////////// //
import (
"errors"
"fmt"
"os"
"strconv"
"strings"
"github.com/essentialkaos/ek/v12/fsutil"
)
// ////////////////////////////////////////////////////////////////////////////////// //
// Dir is a path to directory with PID files
var Dir = "/var/run"
// ////////////////////////////////////////////////////////////////////////////////// //
// Create creates file with process PID file
func Create(name string) error {
err := fsutil.ValidatePerms("DRW", Dir)
if err != nil {
return err
}
if name == "" {
return errors.New("PID file name can't be blank")
}
pidFile := Dir + "/" + normalizePIDFilename(name)
if fsutil.IsExist(pidFile) {
os.Remove(pidFile)
}
return os.WriteFile(
pidFile,
[]byte(fmt.Sprintf("%d\n", os.Getpid())),
0644,
)
}
// Remove removes file with process PID file
func Remove(name string) error {
err := fsutil.ValidatePerms("DRW", Dir)
if err != nil {
return err
}
pidFile := Dir + "/" + normalizePIDFilename(name)
return os.Remove(pidFile)
}
// Get returns PID from PID file
func Get(name string) int {
err := fsutil.ValidatePerms("DR", Dir)
if err != nil {
return -1
}
pidFile := Dir + "/" + normalizePIDFilename(name)
return Read(pidFile)
}
// Read just reads PID from PID file
func Read(pidFile string) int {
data, err := os.ReadFile(pidFile)
if err != nil {
return -1
}
pid, err := strconv.Atoi(strings.TrimRight(string(data), "\n"))
if err != nil {
return -1
}
return pid
}
// ////////////////////////////////////////////////////////////////////////////////// //
// normalizePIDFilename returns PID file name with extension
func normalizePIDFilename(name string) string {
if !strings.Contains(name, ".pid") {
return name + ".pid"
}
return name
}