| // Copyright 2009 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 ( |
| "io" |
| "os" |
| "syscall" |
| "time" |
| ) |
| |
| // TCPConn is an implementation of the Conn interface for TCP network |
| // connections. |
| type TCPConn struct { |
| conn |
| } |
| |
| func newTCPConn(fd *netFD) *TCPConn { |
| return &TCPConn{conn{fd}} |
| } |
| |
| // ReadFrom implements the io.ReaderFrom ReadFrom method. |
| func (c *TCPConn) ReadFrom(r io.Reader) (int64, error) { |
| return genericReadFrom(c, r) |
| } |
| |
| // CloseRead shuts down the reading side of the TCP connection. |
| // Most callers should just use Close. |
| func (c *TCPConn) CloseRead() error { |
| if !c.ok() { |
| return syscall.EINVAL |
| } |
| return c.fd.closeRead() |
| } |
| |
| // CloseWrite shuts down the writing side of the TCP connection. |
| // Most callers should just use Close. |
| func (c *TCPConn) CloseWrite() error { |
| if !c.ok() { |
| return syscall.EINVAL |
| } |
| return c.fd.closeWrite() |
| } |
| |
| // SetLinger sets the behavior of Close on a connection which still |
| // has data waiting to be sent or to be acknowledged. |
| // |
| // If sec < 0 (the default), the operating system finishes sending the |
| // data in the background. |
| // |
| // If sec == 0, the operating system discards any unsent or |
| // unacknowledged data. |
| // |
| // If sec > 0, the data is sent in the background as with sec < 0. On |
| // some operating systems after sec seconds have elapsed any remaining |
| // unsent data may be discarded. |
| func (c *TCPConn) SetLinger(sec int) error { |
| return syscall.EPLAN9 |
| } |
| |
| // SetKeepAlive sets whether the operating system should send |
| // keepalive messages on the connection. |
| func (c *TCPConn) SetKeepAlive(keepalive bool) error { |
| if !c.ok() { |
| return syscall.EPLAN9 |
| } |
| return setKeepAlive(c.fd, keepalive) |
| } |
| |
| // SetKeepAlivePeriod sets period between keep alives. |
| func (c *TCPConn) SetKeepAlivePeriod(d time.Duration) error { |
| if !c.ok() { |
| return syscall.EPLAN9 |
| } |
| return setKeepAlivePeriod(c.fd, d) |
| } |
| |
| // SetNoDelay controls whether the operating system should delay |
| // packet transmission in hopes of sending fewer packets (Nagle's |
| // algorithm). The default is true (no delay), meaning that data is |
| // sent as soon as possible after a Write. |
| func (c *TCPConn) SetNoDelay(noDelay bool) error { |
| return syscall.EPLAN9 |
| } |
| |
| // DialTCP connects to the remote address raddr on the network net, |
| // which must be "tcp", "tcp4", or "tcp6". If laddr is not nil, it is |
| // used as the local address for the connection. |
| func DialTCP(net string, laddr, raddr *TCPAddr) (*TCPConn, error) { |
| return dialTCP(net, laddr, raddr, noDeadline) |
| } |
| |
| func dialTCP(net string, laddr, raddr *TCPAddr, deadline time.Time) (*TCPConn, error) { |
| if !deadline.IsZero() { |
| panic("net.dialTCP: deadline not implemented on Plan 9") |
| } |
| switch net { |
| case "tcp", "tcp4", "tcp6": |
| default: |
| return nil, &OpError{"dial", net, raddr, UnknownNetworkError(net)} |
| } |
| if raddr == nil { |
| return nil, &OpError{"dial", net, nil, errMissingAddress} |
| } |
| fd, err := dialPlan9(net, laddr, raddr) |
| if err != nil { |
| return nil, err |
| } |
| return newTCPConn(fd), nil |
| } |
| |
| // TCPListener is a TCP network listener. Clients should typically |
| // use variables of type Listener instead of assuming TCP. |
| type TCPListener struct { |
| fd *netFD |
| } |
| |
| // AcceptTCP accepts the next incoming call and returns the new |
| // connection. |
| func (l *TCPListener) AcceptTCP() (*TCPConn, error) { |
| if l == nil || l.fd == nil || l.fd.ctl == nil { |
| return nil, syscall.EINVAL |
| } |
| fd, err := l.fd.acceptPlan9() |
| if err != nil { |
| return nil, err |
| } |
| return newTCPConn(fd), nil |
| } |
| |
| // Accept implements the Accept method in the Listener interface; it |
| // waits for the next call and returns a generic Conn. |
| func (l *TCPListener) Accept() (Conn, error) { |
| if l == nil || l.fd == nil || l.fd.ctl == nil { |
| return nil, syscall.EINVAL |
| } |
| c, err := l.AcceptTCP() |
| if err != nil { |
| return nil, err |
| } |
| return c, nil |
| } |
| |
| // Close stops listening on the TCP address. |
| // Already Accepted connections are not closed. |
| func (l *TCPListener) Close() error { |
| if l == nil || l.fd == nil || l.fd.ctl == nil { |
| return syscall.EINVAL |
| } |
| if _, err := l.fd.ctl.WriteString("hangup"); err != nil { |
| l.fd.ctl.Close() |
| return &OpError{"close", l.fd.ctl.Name(), l.fd.laddr, err} |
| } |
| return l.fd.ctl.Close() |
| } |
| |
| // Addr returns the listener's network address, a *TCPAddr. |
| func (l *TCPListener) Addr() Addr { return l.fd.laddr } |
| |
| // SetDeadline sets the deadline associated with the listener. |
| // A zero time value disables the deadline. |
| func (l *TCPListener) SetDeadline(t time.Time) error { |
| if l == nil || l.fd == nil || l.fd.ctl == nil { |
| return syscall.EINVAL |
| } |
| return l.fd.setDeadline(t) |
| } |
| |
| // File returns a copy of the underlying os.File, set to blocking |
| // mode. It is the caller's responsibility to close f when finished. |
| // Closing l does not affect f, and closing f does not affect l. |
| // |
| // The returned os.File's file descriptor is different from the |
| // connection's. Attempting to change properties of the original |
| // using this duplicate may or may not have the desired effect. |
| func (l *TCPListener) File() (f *os.File, err error) { return l.dup() } |
| |
| // ListenTCP announces on the TCP address laddr and returns a TCP |
| // listener. Net must be "tcp", "tcp4", or "tcp6". If laddr has a |
| // port of 0, ListenTCP will choose an available port. The caller can |
| // use the Addr method of TCPListener to retrieve the chosen address. |
| func ListenTCP(net string, laddr *TCPAddr) (*TCPListener, error) { |
| switch net { |
| case "tcp", "tcp4", "tcp6": |
| default: |
| return nil, &OpError{"listen", net, laddr, UnknownNetworkError(net)} |
| } |
| if laddr == nil { |
| laddr = &TCPAddr{} |
| } |
| fd, err := listenPlan9(net, laddr) |
| if err != nil { |
| return nil, err |
| } |
| return &TCPListener{fd}, nil |
| } |