1 // Copyright 2014 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.
5 // +build darwin freebsd linux
13 "golang.org/x/net/internal/socket"
16 func (so *sockOpt) getIPMreqn(c *socket.Conn) (*net.Interface, error) {
17 b := make([]byte, so.Len)
18 if _, err := so.Get(c, b); err != nil {
21 mreqn := (*ipMreqn)(unsafe.Pointer(&b[0]))
22 if mreqn.Ifindex == 0 {
25 ifi, err := net.InterfaceByIndex(int(mreqn.Ifindex))
32 func (so *sockOpt) setIPMreqn(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
35 mreqn.Ifindex = int32(ifi.Index)
38 mreqn.Multiaddr = [4]byte{grp[0], grp[1], grp[2], grp[3]}
40 b := (*[sizeofIPMreqn]byte)(unsafe.Pointer(&mreqn))[:sizeofIPMreqn]