libgo/go/net/main_conf_test.go

   1 // Copyright 2015 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 // +build !js,!plan9,!windows
   6
   7 package net
   8
   9 // forceGoDNS forces the resolver configuration to use the pure Go resolver
  10 // and returns a fixup function to restore the old settings.
  11 func forceGoDNS() func() {
  12         c := systemConf()
  13         oldGo := c.netGo
  14         oldCgo := c.netCgo
  15         fixup := func() {
  16                 c.netGo = oldGo
  17                 c.netCgo = oldCgo
  18         }
  19         c.netGo = true
  20         c.netCgo = false
  21         return fixup
  22 }
  23
  24 // forceCgoDNS forces the resolver configuration to use the cgo resolver
  25 // and returns a fixup function to restore the old settings.
  26 // (On non-Unix systems forceCgoDNS returns nil.)
  27 func forceCgoDNS() func() {
  28         c := systemConf()
  29         oldGo := c.netGo
  30         oldCgo := c.netCgo
  31         fixup := func() {
  32                 c.netGo = oldGo
  33                 c.netCgo = oldCgo
  34         }
  35         c.netGo = false
  36         c.netCgo = true
  37         return fixup
  38 }