github.com/mdempsky/go@v0.0.0-20151201204031-5dd372bd1e70/src/net/sockoptip_posix.go (about)

     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 darwin dragonfly freebsd linux netbsd openbsd windows
     6  
     7  package net
     8  
     9  import (
    10  	"os"
    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  	if err := fd.incref(); err != nil {
    20  		return err
    21  	}
    22  	defer fd.decref()
    23  	return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreq(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq))
    24  }
    25  
    26  func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
    27  	var v int
    28  	if ifi != nil {
    29  		v = ifi.Index
    30  	}
    31  	if err := fd.incref(); err != nil {
    32  		return err
    33  	}
    34  	defer fd.decref()
    35  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v))
    36  }
    37  
    38  func setIPv6MulticastLoopback(fd *netFD, v bool) error {
    39  	if err := fd.incref(); err != nil {
    40  		return err
    41  	}
    42  	defer fd.decref()
    43  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v)))
    44  }
    45  
    46  func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
    47  	mreq := &syscall.IPv6Mreq{}
    48  	copy(mreq.Multiaddr[:], ip)
    49  	if ifi != nil {
    50  		mreq.Interface = uint32(ifi.Index)
    51  	}
    52  	if err := fd.incref(); err != nil {
    53  		return err
    54  	}
    55  	defer fd.decref()
    56  	return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq))
    57  }