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. 4 5 package os 6 7 import ( 8 "internal/syscall/windows" 9 "syscall" 10 ) 11 12 func hostname() (name string, err error) { 13 // Use PhysicalDnsHostname to uniquely identify host in a cluster 14 const format = windows.ComputerNamePhysicalDnsHostname 15 16 n := uint32(64) 17 for { 18 b := make([]uint16, n) 19 err := windows.GetComputerNameEx(format, &b[0], &n) 20 if err == nil { 21 return syscall.UTF16ToString(b[:n]), nil 22 } 23 if err != syscall.ERROR_MORE_DATA { 24 return "", NewSyscallError("ComputerNameEx", err) 25 } 26 27 // If we received an ERROR_MORE_DATA, but n doesn't get larger, 28 // something has gone wrong and we may be in an infinite loop 29 if n <= uint32(len(b)) { 30 return "", NewSyscallError("ComputerNameEx", err) 31 } 32 } 33 } 34
