Source: rawconn.go in package net


package net

import (
	"runtime"
	"syscall"
)

BUG(tmm1): On Windows, the Write method of syscall.RawConn does not integrate with the runtime's network poller. It cannot wait for the connection to become writeable, and does not respect deadlines. If the user-provided callback returns false, the Write method will fail immediately.

BUG(mikio): On JS and Plan 9, the Control, Read and Write methods of syscall.RawConn are not implemented.


type rawConn struct {
	fd *netFD
}

func (c *rawConn) ok() bool { return c != nil && c.fd != nil }

func (c *rawConn) Control(f func(uintptr)) error {
	if !c.ok() {
		return syscall.EINVAL
	}
	err := c.fd.pfd.RawControl(f)
	runtime.KeepAlive(c.fd)
	if err != nil {
		err = &OpError{Op: "raw-control", Net: c.fd.net, Source: nil, Addr: c.fd.laddr, Err: err}
	}
	return err
}

func (c *rawConn) Read(f func(uintptr) bool) error {
	if !c.ok() {
		return syscall.EINVAL
	}
	err := c.fd.pfd.RawRead(f)
	runtime.KeepAlive(c.fd)
	if err != nil {
		err = &OpError{Op: "raw-read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}
	return err
}

func (c *rawConn) Write(f func(uintptr) bool) error {
	if !c.ok() {
		return syscall.EINVAL
	}
	err := c.fd.pfd.RawWrite(f)
	runtime.KeepAlive(c.fd)
	if err != nil {
		err = &OpError{Op: "raw-write", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}
	return err
}

func newRawConn(fd *netFD) (*rawConn, error) {
	return &rawConn{fd: fd}, nil
}

type rawListener struct {
	rawConn
}

func (l *rawListener) Read(func(uintptr) bool) error {
	return syscall.EINVAL
}

func (l *rawListener) Write(func(uintptr) bool) error {
	return syscall.EINVAL
}

func newRawListener(fd *netFD) (*rawListener, error) {
	return &rawListener{rawConn{fd: fd}}, nil