1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
package main
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"syscall"
"0xacab.org/leap/bitmask-systray/bitmask"
)
var pidFile = filepath.Join(bitmask.ConfigPath, "systray.pid")
func acquirePID() error {
pid := syscall.Getpid()
current, err := getPID()
if err != nil {
return err
}
if current != 0 && current != pid {
proc, err := os.FindProcess(current)
if err != nil {
return err
}
err = proc.Signal(syscall.Signal(0))
if err == nil {
return fmt.Errorf("Another systray is running with pid: %d", current)
}
}
return setPID(pid)
}
func releasePID() error {
pid := syscall.Getpid()
current, err := getPID()
if err != nil {
return err
}
if current != 0 && current != pid {
return fmt.Errorf("Can't release pid file, is not own by this process")
}
if current == pid {
return os.Remove(pidFile)
}
return nil
}
func getPID() (int, error) {
_, err := os.Stat(pidFile)
if os.IsNotExist(err) {
return 0, nil
}
if err != nil {
return 0, err
}
file, err := os.Open(pidFile)
if err != nil {
return 0, err
}
defer file.Close()
b, err := ioutil.ReadAll(file)
if err != nil {
return 0, err
}
if len(b) == 0 {
return 0, nil
}
return strconv.Atoi(string(b))
}
func setPID(pid int) error {
file, err := os.Create(pidFile)
if err != nil {
return err
}
defer file.Close()
_, err = file.WriteString(fmt.Sprintf("%d", pid))
return err
}
|
