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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 os
import "syscall"
// ENOENV is the Error indicating that an environment variable does not exist.
var ENOENV = NewError("no such environment variable")
// Getenverror retrieves the value of the environment variable named by the key.
// It returns the value and an error, if any.
func Getenverror(key string) (value string, err Error) {
if len(key) == 0 {
return "", EINVAL
}
f, e := Open("/env/" + key)
if iserror(e) {
return "", ENOENV
}
defer f.Close()
var buf [4096]byte
n, e := f.Read(buf[:len(buf)-1])
if iserror(e) {
return "", ENOENV
}
buf[n] = 0
return string(buf[0:n]), nil
}
// Getenv retrieves the value of the environment variable named by the key.
// It returns the value, which will be empty if the variable is not present.
func Getenv(key string) string {
v, _ := Getenverror(key)
return v
}
// Setenv sets the value of the environment variable named by the key.
// It returns an Error, if any.
func Setenv(key, value string) Error {
if len(key) == 0 {
return EINVAL
}
f, e := Create("/env/" + key)
if iserror(e) {
return e
}
defer f.Close()
_, e = f.Write(syscall.StringByteSlice(value))
return nil
}
// Clearenv deletes all environment variables.
func Clearenv() {
syscall.RawSyscall(syscall.SYS_RFORK, syscall.RFCENVG, 0, 0)
}
// Environ returns an array of strings representing the environment,
// in the form "key=value".
func Environ() []string {
env := make([]string, 0, 100)
f, e := Open("/env")
if iserror(e) {
panic(e)
}
defer f.Close()
names, e := f.Readdirnames(-1)
if iserror(e) {
panic(e)
}
for _, k := range names {
if v, e := Getenverror(k); !iserror(e) {
env = append(env, k+"="+v)
}
}
return env[0:len(env)]
}
// TempDir returns the default directory to use for temporary files.
func TempDir() string {
return "/tmp"
}
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