// 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 ( "errors" "sync" "time" ) // BUG(mikio): On NaCl, methods and functions related to // Interface are not implemented. // BUG(mikio): On DragonFly BSD, NetBSD, OpenBSD, Plan 9 and Solaris, // the MulticastAddrs method of Interface is not implemented. var ( errInvalidInterface = errors.New("invalid network interface") errInvalidInterfaceIndex = errors.New("invalid network interface index") errInvalidInterfaceName = errors.New("invalid network interface name") errNoSuchInterface = errors.New("no such network interface") errNoSuchMulticastInterface = errors.New("no such multicast network interface") ) // Interface represents a mapping between network interface name // and index. It also represents network interface facility // information. type Interface struct { Index int // positive integer that starts at one, zero is never used MTU int // maximum transmission unit Name string // e.g., "en0", "lo0", "eth0.100" HardwareAddr HardwareAddr // IEEE MAC-48, EUI-48 and EUI-64 form Flags Flags // e.g., FlagUp, FlagLoopback, FlagMulticast } type Flags uint const ( FlagUp Flags = 1 << iota // interface is up FlagBroadcast // interface supports broadcast access capability FlagLoopback // interface is a loopback interface FlagPointToPoint // interface belongs to a point-to-point link FlagMulticast // interface supports multicast access capability ) var flagNames = []string{ "up", "broadcast", "loopback", "pointtopoint", "multicast", } func (f Flags) String() string { s := "" for i, name := range flagNames { if f&(1<