libgo/go/net/sockoptip_windows.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 import (
   8         "os"
   9         "syscall"
  10         "unsafe"
  11 )
  12
  13 func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
  14         ip, err := interfaceToIPv4Addr(ifi)
  15         if err != nil {
  16                 return os.NewSyscallError("setsockopt", err)
  17         }
  18         var a [4]byte
  19         copy(a[:], ip.To4())
  20         if err := fd.incref(false); err != nil {
  21                 return err
  22         }
  23         defer fd.decref()
  24         err = syscall.Setsockopt(fd.sysfd, int32(syscall.IPPROTO_IP), int32(syscall.IP_MULTICAST_IF), (*byte)(unsafe.Pointer(&a[0])), 4)
  25         if err != nil {
  26                 return os.NewSyscallError("setsockopt", err)
  27         }
  28         return nil
  29 }
  30
  31 func setIPv4MulticastLoopback(fd *netFD, v bool) error {
  32         if err := fd.incref(false); err != nil {
  33                 return err
  34         }
  35         defer fd.decref()
  36         vv := int32(boolint(v))
  37         err := syscall.Setsockopt(fd.sysfd, int32(syscall.IPPROTO_IP), int32(syscall.IP_MULTICAST_LOOP), (*byte)(unsafe.Pointer(&vv)), 4)
  38         if err != nil {
  39                 return os.NewSyscallError("setsockopt", err)
  40         }
  41         return nil
  42 }