75 lines
1.2 KiB
Go
75 lines
1.2 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Plan 9 environment variables.
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package syscall
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import "errors"
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func Getenv(key string) (value string, found bool) {
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if len(key) == 0 {
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return "", false
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}
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f, e := Open("/env/"+key, O_RDONLY)
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if e != nil {
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return "", false
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}
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defer Close(f)
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l, _ := Seek(f, 0, 2)
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Seek(f, 0, 0)
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buf := make([]byte, l)
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n, e := Read(f, buf)
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if e != nil {
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return "", false
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}
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if n > 0 && buf[n-1] == 0 {
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buf = buf[:n-1]
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}
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return string(buf), true
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}
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func Setenv(key, value string) error {
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if len(key) == 0 {
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return errors.New("bad arg in system call")
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}
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f, e := Create("/env/"+key, O_RDWR, 0666)
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if e != nil {
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return e
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}
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defer Close(f)
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_, e = Write(f, []byte(value))
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return nil
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}
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func Clearenv() {
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RawSyscall(SYS_RFORK, RFCENVG, 0, 0)
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}
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func Environ() []string {
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env := make([]string, 0, 100)
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f, e := Open("/env", O_RDONLY)
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if e != nil {
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panic(e)
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}
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defer Close(f)
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names, e := readdirnames(f)
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if e != nil {
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panic(e)
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}
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for _, k := range names {
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if v, ok := Getenv(k); ok {
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env = append(env, k+"="+v)
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}
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}
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return env[0:len(env)]
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}
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