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1 // Copyright 2011 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 package net
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6
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7 import (
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8 "os"
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9 "runtime"
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10 "syscall"
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11 "unsafe"
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12 )
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13
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14 func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
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15 ip, err := interfaceToIPv4Addr(ifi)
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16 if err != nil {
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17 return os.NewSyscallError("setsockopt", err)
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18 }
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19 var a [4]byte
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20 copy(a[:], ip.To4())
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21 err = fd.pfd.Setsockopt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, (*byte)(unsafe.Pointer(&a[0])), 4)
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22 runtime.KeepAlive(fd)
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23 return wrapSyscallError("setsockopt", err)
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24 }
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25
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26 func setIPv4MulticastLoopback(fd *netFD, v bool) error {
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27 err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
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28 runtime.KeepAlive(fd)
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29 return wrapSyscallError("setsockopt", err)
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30 }
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