130 lines
2.6 KiB
Go
130 lines
2.6 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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"io"
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"os"
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"syscall"
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"time"
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)
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// Network file descritor.
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type netFD struct {
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proto, name, dir string
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ctl, data *os.File
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laddr, raddr Addr
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}
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var canCancelIO = true // used for testing current package
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func sysInit() {
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}
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func resolveAndDial(net, addr string, localAddr Addr, deadline time.Time) (Conn, error) {
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// On plan9, use the relatively inefficient
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// goroutine-racing implementation.
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return resolveAndDialChannel(net, addr, localAddr, deadline)
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}
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func newFD(proto, name string, ctl, data *os.File, laddr, raddr Addr) *netFD {
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return &netFD{proto, name, "/net/" + proto + "/" + name, ctl, data, laddr, raddr}
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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) 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.data.Read(b)
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if fd.proto == "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.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 !fd.ok() {
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return syscall.EINVAL
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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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fd.ctl = nil
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fd.data = 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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syscall.ForkLock.RLock()
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dfd, err := syscall.Dup(int(f.Fd()), -1)
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syscall.ForkLock.RUnlock()
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if err != nil {
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return nil, &OpError{"dup", s, fd.laddr, 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 setDeadline(fd *netFD, t time.Time) error {
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return syscall.EPLAN9
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}
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func setReadDeadline(fd *netFD, t time.Time) error {
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return syscall.EPLAN9
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}
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func setWriteDeadline(fd *netFD, t time.Time) error {
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return syscall.EPLAN9
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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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