1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
// 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.
package net
import (
"os"
"syscall"
"unsafe"
)
func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
ip, err := interfaceToIPv4Addr(ifi)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
var a [4]byte
copy(a[:], ip.To4())
if err := fd.incref(false); err != nil {
return err
}
defer fd.decref()
err = syscall.Setsockopt(fd.sysfd, int32(syscall.IPPROTO_IP), int32(syscall.IP_MULTICAST_IF), (*byte)(unsafe.Pointer(&a[0])), 4)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
func setIPv4MulticastLoopback(fd *netFD, v bool) error {
if err := fd.incref(false); err != nil {
return err
}
defer fd.decref()
vv := int32(boolint(v))
err := syscall.Setsockopt(fd.sysfd, int32(syscall.IPPROTO_IP), int32(syscall.IP_MULTICAST_LOOP), (*byte)(unsafe.Pointer(&vv)), 4)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
|
