socket

Documentation

Overview

Package socket provides a portable interface for socket system calls.

Index

• Variables
• func ControlMessageSpace(dataLen int) int
• type Conn
  • func NewConn(c net.Conn) (*Conn, error)
  • func (c *Conn) RecvMsg(m *Message, flags int) error
  • func (c *Conn) RecvMsgs(ms []Message, flags int) (int, error)
  • func (c *Conn) SendMsg(m *Message, flags int) error
  • func (c *Conn) SendMsgs(ms []Message, flags int) (int, error)
• type ControlMessage
  • func NewControlMessage(dataLen []int) ControlMessage
  • func (m ControlMessage) Data(dataLen int) []byte
  • func (m ControlMessage) Marshal(lvl, typ int, data []byte) (ControlMessage, error)
  • func (m ControlMessage) MarshalHeader(lvl, typ, dataLen int) error
  • func (m ControlMessage) Next(dataLen int) ControlMessage
  • func (m ControlMessage) Parse() ([]ControlMessage, error)
  • func (m ControlMessage) ParseHeader() (lvl, typ, dataLen int, err error)
• type Message
• type Option
  • func (o *Option) Get(c *Conn, b []byte) (int, error)
  • func (o *Option) GetInt(c *Conn) (int, error)
  • func (o *Option) Set(c *Conn, b []byte) error
  • func (o *Option) SetInt(c *Conn, v int) error

Variables

var NativeEndian binary.ByteOrder

NativeEndian is the machine native endian implementation of ByteOrder.

Functions

func ControlMessageSpace

func ControlMessageSpace(dataLen int) int

ControlMessageSpace returns the whole length of control message.

Types

type Conn

type Conn struct {
	// contains filtered or unexported fields
}

A Conn represents a raw connection.

func NewConn

func NewConn(c net.Conn) (*Conn, error)

NewConn returns a new raw connection.

func (*Conn) RecvMsg

func (c *Conn) RecvMsg(m *Message, flags int) error

RecvMsg wraps recvmsg system call.

The provided flags is a set of platform-dependent flags, such as syscall.MSG_PEEK.

func (*Conn) RecvMsgs

func (c *Conn) RecvMsgs(ms []Message, flags int) (int, error)

RecvMsgs wraps recvmmsg system call.

It returns the number of processed messages.

The provided flags is a set of platform-dependent flags, such as syscall.MSG_PEEK.

Only Linux supports this.

func (*Conn) SendMsg

func (c *Conn) SendMsg(m *Message, flags int) error

SendMsg wraps sendmsg system call.

The provided flags is a set of platform-dependent flags, such as syscall.MSG_DONTROUTE.

func (*Conn) SendMsgs

func (c *Conn) SendMsgs(ms []Message, flags int) (int, error)

SendMsgs wraps sendmmsg system call.

It returns the number of processed messages.

The provided flags is a set of platform-dependent flags, such as syscall.MSG_DONTROUTE.

Only Linux supports this.

type ControlMessage

type ControlMessage []byte

A ControlMessage represents the head message in a stream of control messages.

A control message comprises of a header, data and a few padding fields to conform to the interface to the kernel.

See RFC 3542 for further information.

func NewControlMessage

func NewControlMessage(dataLen []int) ControlMessage

NewControlMessage returns a new stream of control messages.

func (ControlMessage) Data

func (m ControlMessage) Data(dataLen int) []byte

Data returns the data field of the control message at the head on m.

func (ControlMessage) Marshal

func (m ControlMessage) Marshal(lvl, typ int, data []byte) (ControlMessage, error)

Marshal marshals the control message at the head on m, and returns the next control message.

func (ControlMessage) MarshalHeader

func (m ControlMessage) MarshalHeader(lvl, typ, dataLen int) error

MarshalHeader marshals the header fields of the control message at the head on m.

func (ControlMessage) Next

func (m ControlMessage) Next(dataLen int) ControlMessage

Next returns the control message at the next on m.

Next works only for standard control messages.

func (ControlMessage) Parse

func (m ControlMessage) Parse() ([]ControlMessage, error)

Parse parses m as a single or multiple control messages.

Parse works for both standard and compatible messages.

func (ControlMessage) ParseHeader

func (m ControlMessage) ParseHeader() (lvl, typ, dataLen int, err error)

ParseHeader parses and returns the header fields of the control message at the head on m.

type Message

type Message struct {
	// When writing, the Buffers field must contain at least one
	// byte to write.
	// When reading, the Buffers field will always contain a byte
	// to read.
	Buffers [][]byte

	// OOB contains protocol-specific control or miscellaneous
	// ancillary data known as out-of-band data.
	OOB []byte

	// Addr specifies a destination address when writing.
	// It can be nil when the underlying protocol of the raw
	// connection uses connection-oriented communication.
	// After a successful read, it may contain the source address
	// on the received packet.
	Addr net.Addr

	N     int // # of bytes read or written from/to Buffers
	NN    int // # of bytes read or written from/to OOB
	Flags int // protocol-specific information on the received message
}

A Message represents an IO message.

type Option

type Option struct {
	Level int // level
	Name  int // name; must be equal or greater than 1
	Len   int // length of value in bytes; must be equal or greater than 1
}

An Option represents a sticky socket option.

func (*Option) Get

func (o *Option) Get(c *Conn, b []byte) (int, error)

Get reads a value for the option from the kernel. It returns the number of bytes written into b.

func (*Option) GetInt

func (o *Option) GetInt(c *Conn) (int, error)

GetInt returns an integer value for the option.

The Len field of Option must be either 1 or 4.

func (*Option) Set

func (o *Option) Set(c *Conn, b []byte) error

Set writes the option and value to the kernel.

func (*Option) SetInt

func (o *Option) SetInt(c *Conn, v int) error

SetInt writes the option and value to the kernel.

The Len field of Option must be either 1 or 4.