| // 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)] |
| } |