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
| // Copyright 2011 The Go Authors. All rights reserved.
| // Use of this source code is governed by a BSD-style
| // license that can be found in the LICENSE file.
|
| // Plan 9 environment variables.
|
| package syscall
|
| import (
| "errors"
| )
|
| var (
| errZeroLengthKey = errors.New("zero length key")
| errShortWrite = errors.New("i/o count too small")
| )
|
| func readenv(key string) (string, error) {
| fd, err := open("/env/"+key, O_RDONLY)
| if err != nil {
| return "", err
| }
| defer Close(fd)
| l, _ := Seek(fd, 0, 2)
| Seek(fd, 0, 0)
| buf := make([]byte, l)
| n, err := Read(fd, buf)
| if err != nil {
| return "", err
| }
| if n > 0 && buf[n-1] == 0 {
| buf = buf[:n-1]
| }
| return string(buf), nil
| }
|
| func writeenv(key, value string) error {
| fd, err := create("/env/"+key, O_RDWR, 0666)
| if err != nil {
| return err
| }
| defer Close(fd)
| b := []byte(value)
| n, err := Write(fd, b)
| if err != nil {
| return err
| }
| if n != len(b) {
| return errShortWrite
| }
| return nil
| }
|
| func Getenv(key string) (value string, found bool) {
| if len(key) == 0 {
| return "", false
| }
| v, err := readenv(key)
| if err != nil {
| return "", false
| }
| return v, true
| }
|
| func Setenv(key, value string) error {
| if len(key) == 0 {
| return errZeroLengthKey
| }
| err := writeenv(key, value)
| if err != nil {
| return err
| }
| return nil
| }
|
| func Clearenv() {
| RawSyscall(SYS_RFORK, RFCENVG, 0, 0)
| }
|
| func Unsetenv(key string) error {
| if len(key) == 0 {
| return errZeroLengthKey
| }
| Remove("/env/" + key)
| return nil
| }
|
| func Environ() []string {
| fd, err := open("/env", O_RDONLY)
| if err != nil {
| return nil
| }
| defer Close(fd)
| files, err := readdirnames(fd)
| if err != nil {
| return nil
| }
| ret := make([]string, 0, len(files))
|
| for _, key := range files {
| v, err := readenv(key)
| if err != nil {
| continue
| }
| ret = append(ret, key+"="+v)
| }
| return ret
| }
|
|
