github.com/peggyl/go@v0.0.0-20151008231540-ae315999c2d5/src/net/sockoptip_windows.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  package net
     6  
     7  import (
     8  	"os"
     9  	"syscall"
    10  	"unsafe"
    11  )
    12  
    13  func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
    14  	ip, err := interfaceToIPv4Addr(ifi)
    15  	if err != nil {
    16  		return os.NewSyscallError("setsockopt", err)
    17  	}
    18  	var a [4]byte
    19  	copy(a[:], ip.To4())
    20  	if err := fd.incref(); err != nil {
    21  		return err
    22  	}
    23  	defer fd.decref()
    24  	return os.NewSyscallError("setsockopt", syscall.Setsockopt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, (*byte)(unsafe.Pointer(&a[0])), 4))
    25  }
    26  
    27  func setIPv4MulticastLoopback(fd *netFD, v bool) error {
    28  	if err := fd.incref(); err != nil {
    29  		return err
    30  	}
    31  	defer fd.decref()
    32  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v)))
    33  }