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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
* Copyright (C) 2016 ~ 2018 Deepin Technology Co., Ltd.
*
* Author: jouyouyun <jouyouwen717@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package procfs
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"pkg.deepin.io/lib/encoding/kv"
"strconv"
"strings"
)
type Process uint
func (p Process) getFile(name string) string {
return fmt.Sprintf("/proc/%d/%s", uint(p), name)
}
func (p Process) Exist() bool {
procDir := fmt.Sprintf("/proc/%d", uint(p))
_, err := os.Stat(procDir)
return err == nil
}
func (p Process) Cmdline() ([]string, error) {
cmdlineFile := p.getFile("cmdline")
bytes, err := ioutil.ReadFile(cmdlineFile)
if err != nil {
return nil, err
}
content := string(bytes)
parts := strings.Split(content, "\x00")
length := len(parts)
if length >= 2 && parts[length-1] == "" {
return parts[:length-1], nil
}
return parts, nil
}
func (p Process) Cwd() (string, error) {
cwdFile := p.getFile("cwd")
cwd, err := os.Readlink(cwdFile)
return cwd, err
}
func (p Process) Exe() (string, error) {
exeFile := p.getFile("exe")
exe, err := filepath.EvalSymlinks(exeFile)
return exe, err
}
type EnvVars []string
func (p Process) Environ() (EnvVars, error) {
envFile := p.getFile("environ")
contents, err := ioutil.ReadFile(envFile)
if err != nil {
return nil, err
}
return strings.Split(string(contents), "\x00"), nil
}
func (vars EnvVars) Lookup(key string) (string, bool) {
prefix := key + "="
for _, aVar := range vars {
if strings.HasPrefix(aVar, prefix) {
return aVar[len(prefix):], true
}
}
return "", false
}
func (vars EnvVars) Get(key string) string {
ret, _ := vars.Lookup(key)
return ret
}
type Status []*kv.Pair
func (p Process) Status() (Status, error) {
statusFile := p.getFile("status")
f, err := os.Open(statusFile)
if err != nil {
return nil, err
}
defer f.Close()
r := kv.NewReader(f)
r.Delim = ':'
r.TrimSpace = kv.TrimDelimRightSpace | kv.TrimTailingSpace
pairs, err := r.ReadAll()
if err != nil {
return nil, err
}
return Status(pairs), nil
}
func (st Status) lookup(key string) (string, error) {
for _, pair := range st {
if pair.Key == key {
return pair.Value, nil
}
}
return "", StatusFieldNotFoundErr{key}
}
type StatusFieldNotFoundErr struct {
Field string
}
func (err StatusFieldNotFoundErr) Error() string {
return fmt.Sprintf("field %s is not found in proc status file", err.Field)
}
func (st Status) Uids() ([]uint, error) {
uids := make([]uint, 0, 4)
value, err := st.lookup("Uid")
if err != nil {
return nil, err
}
for _, i := range strings.Split(value, "\t") {
v, err := strconv.ParseUint(i, 10, 32)
if err != nil {
return nil, err
}
uids = append(uids, uint(v))
}
return uids, nil
}
func (st Status) PPid() (uint, error) {
value, err := st.lookup("PPid")
if err != nil {
return 0, err
}
v, err := strconv.ParseUint(value, 10, 32)
if err != nil {
return 0, err
}
return uint(v), nil
}
|
