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[unix-separados] / ipv6 / sockopt_asmreq_posix.go 

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// Copyright 2013 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build darwin dragonfly freebsd linux netbsd openbsd windows

package ipv6

import (
	"net"
	"os"
	"unsafe"

	"golang.org/x/net/internal/netsyscall"
)

func setsockoptIPMreq(s uintptr, opt *sockOpt, ifi *net.Interface, grp net.IP) error {
	var mreq sysIPv6Mreq
	copy(mreq.Multiaddr[:], grp)
	if ifi != nil {
		mreq.setIfindex(ifi.Index)
	}
	return os.NewSyscallError("setsockopt", netsyscall.Setsockopt(s, opt.level, opt.name, unsafe.Pointer(&mreq), sysSizeofIPv6Mreq))
}