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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
// +build linux netbsd
package ps
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
)
// UnixProcess is an implementation of Process that contains Unix-specific
// fields and information.
type UnixProcess struct {
pid int
ppid int
state rune
pgrp int
sid int
binary string // binary name might be truncated
}
// Pid returns process id
func (p *UnixProcess) Pid() int {
return p.pid
}
// PPid returns parent process id
func (p *UnixProcess) PPid() int {
return p.ppid
}
// Executable returns process executable name
func (p *UnixProcess) Executable() string {
path, err := p.Path()
if err != nil {
// Fall back to binary name which might be truncated
return p.binary
}
return filepath.Base(path)
}
// Path returns path to process executable
func (p *UnixProcess) Path() (string, error) {
return filepath.EvalSymlinks(fmt.Sprintf("/proc/%d/exe", p.pid))
}
// Refresh reloads all the data associated with this process.
func (p *UnixProcess) Refresh() error {
statPath := fmt.Sprintf("/proc/%d/stat", p.pid)
dataBytes, err := ioutil.ReadFile(statPath)
if err != nil {
return err
}
// First, parse out the image name
data := string(dataBytes)
binStart := strings.IndexRune(data, '(') + 1
binEnd := strings.IndexRune(data[binStart:], ')')
p.binary = data[binStart : binStart+binEnd]
// Move past the image name and start parsing the rest
// The name here might not be the full name
data = data[binStart+binEnd+2:]
_, err = fmt.Sscanf(data,
"%c %d %d %d",
&p.state,
&p.ppid,
&p.pgrp,
&p.sid)
return err
}
func findProcess(pid int) (Process, error) {
dir := fmt.Sprintf("/proc/%d", pid)
_, err := os.Stat(dir)
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
return nil, err
}
return newUnixProcess(pid)
}
func processes() ([]Process, error) {
d, err := os.Open("/proc")
if err != nil {
return nil, err
}
defer d.Close()
results := make([]Process, 0, 50)
for {
fis, err := d.Readdir(10)
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
for _, fi := range fis {
// We only care about directories, since all pids are dirs
if !fi.IsDir() {
continue
}
// We only care if the name starts with a numeric
name := fi.Name()
if name[0] < '0' || name[0] > '9' {
continue
}
// From this point forward, any errors we just ignore, because
// it might simply be that the process doesn't exist anymore.
pid, err := strconv.ParseInt(name, 10, 0)
if err != nil {
continue
}
p, err := newUnixProcess(int(pid))
if err != nil {
continue
}
results = append(results, p)
}
}
return results, nil
}
func newUnixProcess(pid int) (*UnixProcess, error) {
p := &UnixProcess{pid: pid}
return p, p.Refresh()
}
|
