libgo/go/net/rawconn.go

   1 // Copyright 2017 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package net
   6
   7 import (
   8         "runtime"
   9         "syscall"
  10 )
  11
  12 // BUG(tmm1): On Windows, the Write method of syscall.RawConn
  13 // does not integrate with the runtime's network poller. It cannot
  14 // wait for the connection to become writeable, and does not respect
  15 // deadlines. If the user-provided callback returns false, the Write
  16 // method will fail immediately.
  17
  18 // BUG(mikio): On JS, NaCl and Plan 9, the Control, Read and Write
  19 // methods of syscall.RawConn are not implemented.
  20
  21 type rawConn struct {
  22         fd *netFD
  23 }
  24
  25 func (c *rawConn) ok() bool { return c != nil && c.fd != nil }
  26
  27 func (c *rawConn) Control(f func(uintptr)) error {
  28         if !c.ok() {
  29                 return syscall.EINVAL
  30         }
  31         err := c.fd.pfd.RawControl(f)
  32         runtime.KeepAlive(c.fd)
  33         if err != nil {
  34                 err = &OpError{Op: "raw-control", Net: c.fd.net, Source: nil, Addr: c.fd.laddr, Err: err}
  35         }
  36         return err
  37 }
  38
  39 func (c *rawConn) Read(f func(uintptr) bool) error {
  40         if !c.ok() {
  41                 return syscall.EINVAL
  42         }
  43         err := c.fd.pfd.RawRead(f)
  44         runtime.KeepAlive(c.fd)
  45         if err != nil {
  46                 err = &OpError{Op: "raw-read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
  47         }
  48         return err
  49 }
  50
  51 func (c *rawConn) Write(f func(uintptr) bool) error {
  52         if !c.ok() {
  53                 return syscall.EINVAL
  54         }
  55         err := c.fd.pfd.RawWrite(f)
  56         runtime.KeepAlive(c.fd)
  57         if err != nil {
  58                 err = &OpError{Op: "raw-write", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
  59         }
  60         return err
  61 }
  62
  63 func newRawConn(fd *netFD) (*rawConn, error) {
  64         return &rawConn{fd: fd}, nil
  65 }
  66
  67 type rawListener struct {
  68         rawConn
  69 }
  70
  71 func (l *rawListener) Read(func(uintptr) bool) error {
  72         return syscall.EINVAL
  73 }
  74
  75 func (l *rawListener) Write(func(uintptr) bool) error {
  76         return syscall.EINVAL
  77 }
  78
  79 func newRawListener(fd *netFD) (*rawListener, error) {
  80         return &rawListener{rawConn{fd: fd}}, nil
  81 }