175 lines
3.3 KiB
Go
175 lines
3.3 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package net
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import (
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"internal/poll"
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"io"
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"os"
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"syscall"
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)
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// Network file descriptor.
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type netFD struct {
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pfd poll.FD
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// immutable until Close
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net string
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n string
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dir string
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listen, ctl, data *os.File
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laddr, raddr Addr
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isStream bool
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}
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var netdir = "/net" // default network
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func newFD(net, name string, listen, ctl, data *os.File, laddr, raddr Addr) (*netFD, error) {
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ret := &netFD{
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net: net,
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n: name,
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dir: netdir + "/" + net + "/" + name,
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listen: listen,
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ctl: ctl, data: data,
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laddr: laddr,
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raddr: raddr,
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}
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ret.pfd.Destroy = ret.destroy
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return ret, nil
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}
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func (fd *netFD) init() error {
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// stub for future fd.pd.Init(fd)
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return nil
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}
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func (fd *netFD) name() string {
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var ls, rs string
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if fd.laddr != nil {
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ls = fd.laddr.String()
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}
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if fd.raddr != nil {
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rs = fd.raddr.String()
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}
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return fd.net + ":" + ls + "->" + rs
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}
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func (fd *netFD) ok() bool { return fd != nil && fd.ctl != nil }
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func (fd *netFD) destroy() {
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if !fd.ok() {
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return
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}
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err := fd.ctl.Close()
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if fd.data != nil {
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if err1 := fd.data.Close(); err1 != nil && err == nil {
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err = err1
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}
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}
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if fd.listen != nil {
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if err1 := fd.listen.Close(); err1 != nil && err == nil {
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err = err1
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}
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}
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fd.ctl = nil
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fd.data = nil
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fd.listen = nil
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}
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func (fd *netFD) Read(b []byte) (n int, err error) {
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if !fd.ok() || fd.data == nil {
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return 0, syscall.EINVAL
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}
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n, err = fd.pfd.Read(fd.data.Read, b)
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if fd.net == "udp" && err == io.EOF {
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n = 0
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err = nil
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}
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return
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}
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func (fd *netFD) Write(b []byte) (n int, err error) {
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if !fd.ok() || fd.data == nil {
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return 0, syscall.EINVAL
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}
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return fd.pfd.Write(fd.data.Write, b)
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}
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func (fd *netFD) closeRead() error {
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if !fd.ok() {
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return syscall.EINVAL
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}
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return syscall.EPLAN9
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}
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func (fd *netFD) closeWrite() error {
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if !fd.ok() {
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return syscall.EINVAL
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}
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return syscall.EPLAN9
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}
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func (fd *netFD) Close() error {
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if err := fd.pfd.Close(); err != nil {
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return err
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}
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if !fd.ok() {
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return syscall.EINVAL
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}
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if fd.net == "tcp" {
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// The following line is required to unblock Reads.
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_, err := fd.ctl.WriteString("close")
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if err != nil {
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return err
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}
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}
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err := fd.ctl.Close()
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if fd.data != nil {
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if err1 := fd.data.Close(); err1 != nil && err == nil {
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err = err1
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}
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}
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if fd.listen != nil {
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if err1 := fd.listen.Close(); err1 != nil && err == nil {
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err = err1
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}
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}
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fd.ctl = nil
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fd.data = nil
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fd.listen = nil
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return err
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}
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// This method is only called via Conn.
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func (fd *netFD) dup() (*os.File, error) {
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if !fd.ok() || fd.data == nil {
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return nil, syscall.EINVAL
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}
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return fd.file(fd.data, fd.dir+"/data")
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}
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func (l *TCPListener) dup() (*os.File, error) {
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if !l.fd.ok() {
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return nil, syscall.EINVAL
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}
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return l.fd.file(l.fd.ctl, l.fd.dir+"/ctl")
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}
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func (fd *netFD) file(f *os.File, s string) (*os.File, error) {
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dfd, err := syscall.Dup(int(f.Fd()), -1)
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if err != nil {
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return nil, os.NewSyscallError("dup", err)
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}
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return os.NewFile(uintptr(dfd), s), nil
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}
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func setReadBuffer(fd *netFD, bytes int) error {
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return syscall.EPLAN9
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}
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func setWriteBuffer(fd *netFD, bytes int) error {
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return syscall.EPLAN9
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}
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