libgo/go/net/sockoptip_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 import (
   8         "os"
   9         "syscall"
  10 )
  11
  12 func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
  13         var v int32
  14         if ifi != nil {
  15                 v = int32(ifi.Index)
  16         }
  17         mreq := &syscall.IPMreqn{Ifindex: v}
  18         if err := fd.incref(false); err != nil {
  19                 return err
  20         }
  21         defer fd.decref()
  22         err := syscall.SetsockoptIPMreqn(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq)
  23         if err != nil {
  24                 return os.NewSyscallError("setsockopt", err)
  25         }
  26         return nil
  27 }
  28
  29 func setIPv4MulticastLoopback(fd *netFD, v bool) error {
  30         if err := fd.incref(false); err != nil {
  31                 return err
  32         }
  33         defer fd.decref()
  34         err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
  35         if err != nil {
  36                 return os.NewSyscallError("setsockopt", err)
  37         }
  38         return nil
  39 }