Source file src/pkg/net/sockoptip_posix.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	// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
     6	
     7	package net
     8	
     9	import (
    10		"runtime"
    11		"syscall"
    12	)
    13	
    14	func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
    15		mreq := &syscall.IPMreq{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}}
    16		if err := setIPv4MreqToInterface(mreq, ifi); err != nil {
    17			return err
    18		}
    19		err := fd.pfd.SetsockoptIPMreq(syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)
    20		runtime.KeepAlive(fd)
    21		return wrapSyscallError("setsockopt", err)
    22	}
    23	
    24	func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
    25		var v int
    26		if ifi != nil {
    27			v = ifi.Index
    28		}
    29		err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v)
    30		runtime.KeepAlive(fd)
    31		return wrapSyscallError("setsockopt", err)
    32	}
    33	
    34	func setIPv6MulticastLoopback(fd *netFD, v bool) error {
    35		err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))
    36		runtime.KeepAlive(fd)
    37		return wrapSyscallError("setsockopt", err)
    38	}
    39	
    40	func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
    41		mreq := &syscall.IPv6Mreq{}
    42		copy(mreq.Multiaddr[:], ip)
    43		if ifi != nil {
    44			mreq.Interface = uint32(ifi.Index)
    45		}
    46		err := fd.pfd.SetsockoptIPv6Mreq(syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq)
    47		runtime.KeepAlive(fd)
    48		return wrapSyscallError("setsockopt", err)
    49	}
    50	

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