1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
12 func hostname() (name string, err error) {
13 // Try uname first, as it's only one system call and reading
14 // from /proc is not allowed on Android.
15 var un syscall.Utsname
16 err = syscall.Uname(&un)
18 var buf [512]byte // Enough for a DNS name.
19 for i, b := range un.Nodename[:] {
22 name = string(buf[:i])
26 // If we got a name and it's not potentially truncated
27 // (Nodename is 65 bytes), return it.
28 if err == nil && len(name) > 0 && len(name) < 64 {
31 if runtime.GOOS == "android" {
35 return "localhost", nil
38 f, err := Open("/proc/sys/kernel/hostname")
44 n, err := f.Read(buf[:])
49 if n > 0 && buf[n-1] == '\n' {
52 return string(buf[:n]), nil