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Source file src/net/sockoptip_posix.go

Documentation: net

  // Copyright 2011 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 net
  
  import (
  	"os"
  	"syscall"
  )
  
  func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
  	mreq := &syscall.IPMreq{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}}
  	if err := setIPv4MreqToInterface(mreq, ifi); err != nil {
  		return err
  	}
  	if err := fd.incref(); err != nil {
  		return err
  	}
  	defer fd.decref()
  	return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreq(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq))
  }
  
  func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
  	var v int
  	if ifi != nil {
  		v = ifi.Index
  	}
  	if err := fd.incref(); err != nil {
  		return err
  	}
  	defer fd.decref()
  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v))
  }
  
  func setIPv6MulticastLoopback(fd *netFD, v bool) error {
  	if err := fd.incref(); err != nil {
  		return err
  	}
  	defer fd.decref()
  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v)))
  }
  
  func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
  	mreq := &syscall.IPv6Mreq{}
  	copy(mreq.Multiaddr[:], ip)
  	if ifi != nil {
  		mreq.Interface = uint32(ifi.Index)
  	}
  	if err := fd.incref(); err != nil {
  		return err
  	}
  	defer fd.decref()
  	return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq))
  }
  

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