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// 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"
func Getenv(key string) (value string, found bool) {
if len(key) == 0 {
return "", false
}
f, e := Open("/env/"+key, O_RDONLY)
if e != nil {
return "", false
}
defer Close(f)
l, _ := Seek(f, 0, 2)
Seek(f, 0, 0)
buf := make([]byte, l)
n, e := Read(f, buf)
if e != nil {
return "", false
}
if n > 0 && buf[n-1] == 0 {
buf = buf[:n-1]
}
return string(buf), true
}
func Setenv(key, value string) error {
if len(key) == 0 {
return errors.New("bad arg in system call")
}
f, e := Create("/env/"+key, O_RDWR, 0666)
if e != nil {
return e
}
defer Close(f)
_, e = Write(f, []byte(value))
return nil
}
func Clearenv() {
RawSyscall(SYS_RFORK, RFCENVG, 0, 0)
}
func Environ() []string {
env := make([]string, 0, 100)
f, e := Open("/env", O_RDONLY)
if e != nil {
panic(e)
}
defer Close(f)
names, e := readdirnames(f)
if e != nil {
panic(e)
}
for _, k := range names {
if v, ok := Getenv(k); ok {
env = append(env, k+"="+v)
}
}
return env[0:len(env)]
}
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