Source file src/pkg/os/sys_windows.go

     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	

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