2012-03-27 23:13:14 +00:00
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// 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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// TCPConn is an implementation of the Conn interface for TCP network
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// connections.
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type TCPConn struct {
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conn
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}
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func newTCPConn(fd *netFD) *TCPConn {
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return &TCPConn{conn{fd}}
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}
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// ReadFrom implements the io.ReaderFrom ReadFrom method.
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func (c *TCPConn) ReadFrom(r io.Reader) (int64, error) {
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return genericReadFrom(c, r)
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}
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// CloseRead shuts down the reading side of the TCP connection.
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// Most callers should just use Close.
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func (c *TCPConn) CloseRead() error {
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if !c.ok() {
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return syscall.EINVAL
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}
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return c.fd.CloseRead()
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}
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// CloseWrite shuts down the writing side of the TCP connection.
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// Most callers should just use Close.
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func (c *TCPConn) CloseWrite() error {
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if !c.ok() {
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return syscall.EINVAL
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}
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return c.fd.CloseWrite()
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}
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// SetLinger sets the behavior of Close() on a connection which still
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// has data waiting to be sent or to be acknowledged.
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//
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// If sec < 0 (the default), Close returns immediately and the
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// operating system finishes sending the data in the background.
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//
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// If sec == 0, Close returns immediately and the operating system
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// discards any unsent or unacknowledged data.
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//
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// If sec > 0, Close blocks for at most sec seconds waiting for data
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// to be sent and acknowledged.
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func (c *TCPConn) SetLinger(sec int) error {
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return syscall.EPLAN9
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}
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// SetKeepAlive sets whether the operating system should send
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// keepalive messages on the connection.
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func (c *TCPConn) SetKeepAlive(keepalive bool) error {
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return syscall.EPLAN9
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}
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// SetKeepAlivePeriod sets period between keep alives.
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func (c *TCPConn) SetKeepAlivePeriod(d time.Duration) error {
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return syscall.EPLAN9
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}
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// SetNoDelay controls whether the operating system should delay
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// packet transmission in hopes of sending fewer packets (Nagle's
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// algorithm). The default is true (no delay), meaning that data is
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// sent as soon as possible after a Write.
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func (c *TCPConn) SetNoDelay(noDelay bool) error {
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return syscall.EPLAN9
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}
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// DialTCP connects to the remote address raddr on the network net,
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// which must be "tcp", "tcp4", or "tcp6". If laddr is not nil, it is
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// used as the local address for the connection.
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func DialTCP(net string, laddr, raddr *TCPAddr) (*TCPConn, error) {
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return dialTCP(net, laddr, raddr, noDeadline)
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}
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func dialTCP(net string, laddr, raddr *TCPAddr, deadline time.Time) (*TCPConn, error) {
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if !deadline.IsZero() {
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panic("net.dialTCP: deadline not implemented on Plan 9")
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}
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switch net {
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case "tcp", "tcp4", "tcp6":
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default:
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return nil, &OpError{"dial", net, raddr, UnknownNetworkError(net)}
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}
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if raddr == nil {
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return nil, &OpError{"dial", net, nil, errMissingAddress}
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}
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fd, err := dialPlan9(net, laddr, raddr)
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if err != nil {
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return nil, err
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}
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return newTCPConn(fd), nil
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}
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// TCPListener is a TCP network listener. Clients should typically
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// use variables of type Listener instead of assuming TCP.
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type TCPListener struct {
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fd *netFD
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}
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// AcceptTCP accepts the next incoming call and returns the new
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// connection.
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func (l *TCPListener) AcceptTCP() (*TCPConn, error) {
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if l == nil || l.fd == nil || l.fd.ctl == nil {
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return nil, syscall.EINVAL
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}
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fd, err := l.fd.acceptPlan9()
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if err != nil {
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return nil, err
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}
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return newTCPConn(fd), nil
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}
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// Accept implements the Accept method in the Listener interface; it
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// waits for the next call and returns a generic Conn.
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func (l *TCPListener) Accept() (Conn, error) {
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if l == nil || l.fd == nil || l.fd.ctl == nil {
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return nil, syscall.EINVAL
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}
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c, err := l.AcceptTCP()
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if err != nil {
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return nil, err
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}
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return c, nil
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}
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// Close stops listening on the TCP address.
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// Already Accepted connections are not closed.
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func (l *TCPListener) Close() error {
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if l == nil || l.fd == nil || l.fd.ctl == nil {
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return syscall.EINVAL
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}
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if _, err := l.fd.ctl.WriteString("hangup"); err != nil {
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l.fd.ctl.Close()
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return &OpError{"close", l.fd.ctl.Name(), l.fd.laddr, err}
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}
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return l.fd.ctl.Close()
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}
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// Addr returns the listener's network address, a *TCPAddr.
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func (l *TCPListener) Addr() Addr { return l.fd.laddr }
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// SetDeadline sets the deadline associated with the listener.
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// A zero time value disables the deadline.
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func (l *TCPListener) SetDeadline(t time.Time) error {
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if l == nil || l.fd == nil || l.fd.ctl == nil {
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return syscall.EINVAL
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}
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return l.fd.setDeadline(t)
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}
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// File returns a copy of the underlying os.File, set to blocking
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// mode. It is the caller's responsibility to close f when finished.
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// Closing l does not affect f, and closing f does not affect l.
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//
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// The returned os.File's file descriptor is different from the
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// connection's. Attempting to change properties of the original
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// using this duplicate may or may not have the desired effect.
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func (l *TCPListener) File() (f *os.File, err error) { return l.dup() }
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// ListenTCP announces on the TCP address laddr and returns a TCP
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// listener. Net must be "tcp", "tcp4", or "tcp6". If laddr has a
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// port of 0, ListenTCP will choose an available port. The caller can
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// use the Addr method of TCPListener to retrieve the chosen address.
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func ListenTCP(net string, laddr *TCPAddr) (*TCPListener, error) {
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switch net {
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case "tcp", "tcp4", "tcp6":
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default:
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return nil, &OpError{"listen", net, laddr, UnknownNetworkError(net)}
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}
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if laddr == nil {
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laddr = &TCPAddr{}
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}
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fd, err := listenPlan9(net, laddr)
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if err != nil {
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return nil, err
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}
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return &TCPListener{fd}, nil
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}
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