github.com/peggyl/go@v0.0.0-20151008231540-ae315999c2d5/src/net/sockoptip_linux.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  )
    11  
    12  func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
    13  	var v int32
    14  	if ifi != nil {
    15  		v = int32(ifi.Index)
    16  	}
    17  	mreq := &syscall.IPMreqn{Ifindex: v}
    18  	if err := fd.incref(); err != nil {
    19  		return err
    20  	}
    21  	defer fd.decref()
    22  	return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreqn(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq))
    23  }
    24  
    25  func setIPv4MulticastLoopback(fd *netFD, v bool) error {
    26  	if err := fd.incref(); err != nil {
    27  		return err
    28  	}
    29  	defer fd.decref()
    30  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v)))
    31  }