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// 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.
// The net package provides a portable interface to Unix
// networks sockets, including TCP/IP, UDP, domain name
// resolution, and Unix domain sockets.
package net
// TODO(rsc):
// support for raw ethernet sockets
import "os"
// Addr represents a network end point address.
type Addr interface {
Network() string // name of the network
String() string // string form of address
}
// Conn is a generic stream-oriented network connection.
type Conn interface {
// Read reads data from the connection.
// Read can be made to time out and return a net.Error with Timeout() == true
// after a fixed time limit; see SetTimeout and SetReadTimeout.
Read(b []byte) (n int, err os.Error)
// Write writes data to the connection.
// Write can be made to time out and return a net.Error with Timeout() == true
// after a fixed time limit; see SetTimeout and SetWriteTimeout.
Write(b []byte) (n int, err os.Error)
// Close closes the connection.
// The error returned is an os.Error to satisfy io.Closer;
Close() os.Error
// LocalAddr returns the local network address.
LocalAddr() Addr
// RemoteAddr returns the remote network address.
RemoteAddr() Addr
// SetTimeout sets the read and write deadlines associated
// with the connection.
SetTimeout(nsec int64) os.Error
// SetReadTimeout sets the time (in nanoseconds) that
// Read will wait for data before returning an error with Timeout() == true.
// Setting nsec == 0 (the default) disables the deadline.
SetReadTimeout(nsec int64) os.Error
// SetWriteTimeout sets the time (in nanoseconds) that
// Write will wait to send its data before returning an error with Timeout() == true.
// Setting nsec == 0 (the default) disables the deadline.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
SetWriteTimeout(nsec int64) os.Error
}
// An Error represents a network error.
type Error interface {
os.Error
Timeout() bool // Is the error a timeout?
Temporary() bool // Is the error temporary?
}
// PacketConn is a generic packet-oriented network connection.
type PacketConn interface {
// ReadFrom reads a packet from the connection,
// copying the payload into b. It returns the number of
// bytes copied into b and the return address that
// was on the packet.
// ReadFrom can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetTimeout and SetReadTimeout.
ReadFrom(b []byte) (n int, addr Addr, err os.Error)
// WriteTo writes a packet with payload b to addr.
// WriteTo can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetTimeout and SetWriteTimeout.
// On packet-oriented connections, write timeouts are rare.
WriteTo(b []byte, addr Addr) (n int, err os.Error)
// Close closes the connection.
// The error returned is an os.Error to satisfy io.Closer;
Close() os.Error
// LocalAddr returns the local network address.
LocalAddr() Addr
// SetTimeout sets the read and write deadlines associated
// with the connection.
SetTimeout(nsec int64) os.Error
// SetReadTimeout sets the time (in nanoseconds) that
// Read will wait for data before returning an error with Timeout() == true.
// Setting nsec == 0 (the default) disables the deadline.
SetReadTimeout(nsec int64) os.Error
// SetWriteTimeout sets the time (in nanoseconds) that
// Write will wait to send its data before returning an error with Timeout() == true.
// Setting nsec == 0 (the default) disables the deadline.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
SetWriteTimeout(nsec int64) os.Error
}
// A Listener is a generic network listener for stream-oriented protocols.
type Listener interface {
// Accept waits for and returns the next connection to the listener.
Accept() (c Conn, err os.Error)
// Close closes the listener.
// The error returned is an os.Error to satisfy io.Closer;
Close() os.Error
// Addr returns the listener's network address.
Addr() Addr
}
var errMissingAddress = os.ErrorString("missing address")
type OpError struct {
Op string
Net string
Addr Addr
Error os.Error
}
func (e *OpError) String() string {
if e == nil {
return "<nil>"
}
s := e.Op
if e.Net != "" {
s += " " + e.Net
}
if e.Addr != nil {
s += " " + e.Addr.String()
}
s += ": " + e.Error.String()
return s
}
type temporary interface {
Temporary() bool
}
func (e *OpError) Temporary() bool {
t, ok := e.Error.(temporary)
return ok && t.Temporary()
}
type timeout interface {
Timeout() bool
}
func (e *OpError) Timeout() bool {
t, ok := e.Error.(timeout)
return ok && t.Timeout()
}
type AddrError struct {
Error string
Addr string
}
func (e *AddrError) String() string {
if e == nil {
return "<nil>"
}
s := e.Error
if e.Addr != "" {
s += " " + e.Addr
}
return s
}
func (e *AddrError) Temporary() bool {
return false
}
func (e *AddrError) Timeout() bool {
return false
}
type UnknownNetworkError string
func (e UnknownNetworkError) String() string { return "unknown network " + string(e) }
func (e UnknownNetworkError) Temporary() bool { return false }
func (e UnknownNetworkError) Timeout() bool { return false }
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