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(mikio): On Windows, the Read and Write methods of
  13 // syscall.RawConn are not implemented.
  14
  15 // BUG(mikio): On NaCl and Plan 9, the Control, Read and Write methods
  16 // of syscall.RawConn are not implemented.
  17
  18 type rawConn struct {
  19         fd *netFD
  20 }
  21
  22 func (c *rawConn) ok() bool { return c != nil && c.fd != nil }
  23
  24 func (c *rawConn) Control(f func(uintptr)) error {
  25         if !c.ok() {
  26                 return syscall.EINVAL
  27         }
  28         err := c.fd.pfd.RawControl(f)
  29         runtime.KeepAlive(c.fd)
  30         if err != nil {
  31                 err = &OpError{Op: "raw-control", Net: c.fd.net, Source: nil, Addr: c.fd.laddr, Err: err}
  32         }
  33         return err
  34 }
  35
  36 func (c *rawConn) Read(f func(uintptr) bool) error {
  37         if !c.ok() {
  38                 return syscall.EINVAL
  39         }
  40         err := c.fd.pfd.RawRead(f)
  41         runtime.KeepAlive(c.fd)
  42         if err != nil {
  43                 err = &OpError{Op: "raw-read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
  44         }
  45         return err
  46 }
  47
  48 func (c *rawConn) Write(f func(uintptr) bool) error {
  49         if !c.ok() {
  50                 return syscall.EINVAL
  51         }
  52         err := c.fd.pfd.RawWrite(f)
  53         runtime.KeepAlive(c.fd)
  54         if err != nil {
  55                 err = &OpError{Op: "raw-write", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
  56         }
  57         return err
  58 }
  59
  60 func newRawConn(fd *netFD) (*rawConn, error) {
  61         return &rawConn{fd: fd}, nil
  62 }