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
}
|
