43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package net
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import (
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"os"
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"syscall"
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"unsafe"
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)
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func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
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ip, err := interfaceToIPv4Addr(ifi)
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if err != nil {
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return os.NewSyscallError("setsockopt", err)
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}
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var a [4]byte
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copy(a[:], ip.To4())
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if err := fd.incref(false); err != nil {
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return err
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}
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defer fd.decref()
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err = syscall.Setsockopt(fd.sysfd, int32(syscall.IPPROTO_IP), int32(syscall.IP_MULTICAST_IF), (*byte)(unsafe.Pointer(&a[0])), 4)
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if err != nil {
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return os.NewSyscallError("setsockopt", err)
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}
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return nil
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}
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func setIPv4MulticastLoopback(fd *netFD, v bool) error {
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if err := fd.incref(false); err != nil {
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return err
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}
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defer fd.decref()
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vv := int32(boolint(v))
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err := syscall.Setsockopt(fd.sysfd, int32(syscall.IPPROTO_IP), int32(syscall.IP_MULTICAST_LOOP), (*byte)(unsafe.Pointer(&vv)), 4)
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if err != nil {
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return os.NewSyscallError("setsockopt", err)
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}
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return nil
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}
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