| // 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 |
| } |
