libgo/go/net/cgo_linux.go

   1 // Copyright 2011 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 net
   6
   7 /*
   8 #include <netdb.h>
   9 */
  10
  11 import "syscall"
  12
  13 func cgoAddrInfoFlags() int {
  14         // NOTE(rsc): In theory there are approximately balanced
  15         // arguments for and against including AI_ADDRCONFIG
  16         // in the flags (it includes IPv4 results only on IPv4 systems,
  17         // and similarly for IPv6), but in practice setting it causes
  18         // getaddrinfo to return the wrong canonical name on Linux.
  19         // So definitely leave it out.
  20         return syscall.AI_CANONNAME | syscall.AI_V4MAPPED | syscall.AI_ALL
  21 }