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/*
* Copyright 2012-2022 Li Kexian
*
* 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.
*
* A toolkit for Golang development
* https://www.likexian.com/
*/
package xdaemon
import (
"os"
"syscall"
"github.com/likexian/gokit/xfile"
"github.com/likexian/gokit/xos"
)
// Config storing config for daemon
type Config struct {
Pid string
Log string
User string
Chdir string
}
// Version returns package version
func Version() string {
return "0.7.2"
}
// Author returns package author
func Author() string {
return "[Li Kexian](https://www.likexian.com/)"
}
// License returns package license
func License() string {
return "Licensed under the Apache License 2.0"
}
// Daemon start to daemon
func (c *Config) Daemon() (err error) {
var pid *xos.Pidx
if c.Pid != "" {
pid = xos.Pid(c.Pid)
_, err := pid.Alive()
if err == nil {
return xos.ErrPidExists
}
}
err = c.doDaemon()
if err != nil {
return
}
if c.Pid != "" {
_, err = pid.Create()
if err != nil {
return
}
}
if c.User != "" {
err = xos.SetUser(c.User)
if err != nil {
return
}
}
return
}
// Doing the daemon
func (c *Config) doDaemon() (err error) {
syscall.Umask(0)
if c.Chdir != "" {
err = os.Chdir(c.Chdir)
if err != nil {
return
}
}
if syscall.Getppid() == 1 {
return
}
files := make([]*os.File, 3, 6)
if c.Log != "" {
fp, err := xfile.NewFile(c.Log, true)
if err != nil {
return err
}
files[0], files[1], files[2] = fp, fp, fp
} else {
files[0], files[1], files[2] = os.Stdin, os.Stdout, os.Stderr
}
dir, _ := os.Getwd()
sysattrs := syscall.SysProcAttr{Setsid: true}
prcattrs := os.ProcAttr{
Dir: dir,
Env: os.Environ(),
Files: files,
Sys: &sysattrs,
}
proc, err := os.StartProcess(os.Args[0], os.Args, &prcattrs)
if err != nil {
return
}
err = proc.Release()
if err != nil {
return
}
os.Exit(0)
return
}
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