poll

Documentation

Overview

Package poll supports non-blocking I/O on file descriptors with polling. This supports I/O operations that block only a goroutine, not a thread. This is used by the net and os packages. It uses a poller built into the runtime, with support from the runtime scheduler.

Index

• Variables
• func DupCloseOnExec(fd int) (int, string, error)
• func IsPollDescriptor(fd uintptr) bool
• type DeadlineExceededError
  • func (e *DeadlineExceededError) Error() string
  • func (e *DeadlineExceededError) Temporary() bool
  • func (e *DeadlineExceededError) Timeout() bool
• type FD
  • func (fd *FD) Accept() (int, syscall.Sockaddr, string, error)
  • func (fd *FD) Close() error
  • func (fd *FD) Dup() (int, string, error)
  • func (fd *FD) Fchdir() error
  • func (fd *FD) Fchmod(mode uint32) error
  • func (fd *FD) Fchown(uid, gid int) error
  • func (fd *FD) Fstat(s *syscall.Stat_t) error
  • func (fd *FD) Fsync() error
  • func (fd *FD) Ftruncate(size int64) error
  • func (fd *FD) Init(net string, pollable bool) error
  • func (fd *FD) Pread(p []byte, off int64) (int, error)
  • func (fd *FD) Pwrite(p []byte, off int64) (int, error)
  • func (fd *FD) RawControl(f func(uintptr)) error
  • func (fd *FD) RawRead(f func(uintptr) bool) error
  • func (fd *FD) RawWrite(f func(uintptr) bool) error
  • func (fd *FD) Read(p []byte) (int, error)
  • func (fd *FD) ReadDirent(buf []byte) (int, error)
  • func (fd *FD) ReadFrom(p []byte) (int, syscall.Sockaddr, error)
  • func (fd *FD) ReadFromInet4(p []byte, from *syscall.SockaddrInet4) (int, error)
  • func (fd *FD) ReadFromInet6(p []byte, from *syscall.SockaddrInet6) (int, error)
  • func (fd *FD) ReadMsg(p []byte, oob []byte, flags int) (int, int, int, syscall.Sockaddr, error)
  • func (fd *FD) ReadMsgInet4(p []byte, oob []byte, flags int, sa4 *syscall.SockaddrInet4) (int, int, int, error)
  • func (fd *FD) ReadMsgInet6(p []byte, oob []byte, flags int, sa6 *syscall.SockaddrInet6) (int, int, int, error)
  • func (fd *FD) Seek(offset int64, whence int) (int64, error)
  • func (fd *FD) SetBlocking() error
  • func (fd *FD) SetDeadline(t time.Time) error
  • func (fd *FD) SetReadDeadline(t time.Time) error
  • func (fd *FD) SetWriteDeadline(t time.Time) error
  • func (fd *FD) Shutdown(how int) error
  • func (fd *FD) WaitWrite() error
  • func (fd *FD) Write(p []byte) (int, error)
  • func (fd *FD) WriteMsg(p []byte, oob []byte, sa syscall.Sockaddr) (int, int, error)
  • func (fd *FD) WriteMsgInet4(p []byte, oob []byte, sa *syscall.SockaddrInet4) (int, int, error)
  • func (fd *FD) WriteMsgInet6(p []byte, oob []byte, sa *syscall.SockaddrInet6) (int, int, error)
  • func (fd *FD) WriteOnce(p []byte) (int, error)
  • func (fd *FD) WriteTo(p []byte, sa syscall.Sockaddr) (int, error)
  • func (fd *FD) WriteToInet4(p []byte, sa *syscall.SockaddrInet4) (int, error)
  • func (fd *FD) WriteToInet6(p []byte, sa *syscall.SockaddrInet6) (int, error)
• type String
• type SysFile

Variables

var AcceptFunc func(int) (int, syscall.Sockaddr, error) = syscall.Accept

AcceptFunc is used to hook the accept call.

var CloseFunc func(int) error = syscall.Close

CloseFunc is used to hook the close call.

var ErrDeadlineExceeded error = &DeadlineExceededError{}

ErrDeadlineExceeded is returned for an expired deadline. This is exported by the os package as os.ErrDeadlineExceeded.

var ErrFileClosing = errors.New("use of closed file")

ErrFileClosing is returned when a file descriptor is used after it has been closed.

var ErrNetClosing = errNetClosing{}

ErrNetClosing is returned when a network descriptor is used after it has been closed.

var ErrNoDeadline = errors.New("file type does not support deadline")

ErrNoDeadline is returned when a request is made to set a deadline on a file type that does not use the poller.

var ErrNotPollable = errors.New("not pollable")

ErrNotPollable is returned when the file or socket is not suitable for event notification.

var TestHookDidSendFile = func(dstFD *FD, src uintptr, written int64, err error, handled bool) {}

var TestHookDidWritev = func(wrote int) {}

TestHookDidWritev is a hook for testing writev.

Functions

func DupCloseOnExec

func DupCloseOnExec(fd int) (int, string, error)

DupCloseOnExec dups fd and marks it close-on-exec.

func IsPollDescriptor

func IsPollDescriptor(fd uintptr) bool

IsPollDescriptor reports whether fd is the descriptor being used by the poller. This is only used for testing.

Types

type DeadlineExceededError

type DeadlineExceededError struct{}

DeadlineExceededError is returned for an expired deadline.

func (*DeadlineExceededError) Error

func (e *DeadlineExceededError) Error() string

Implement the net.Error interface. The string is "i/o timeout" because that is what was returned by earlier Go versions. Changing it may break programs that match on error strings.

func (*DeadlineExceededError) Temporary

func (e *DeadlineExceededError) Temporary() bool

func (*DeadlineExceededError) Timeout

func (e *DeadlineExceededError) Timeout() bool

type FD

type FD struct {

	// System file descriptor. Immutable until Close.
	Sysfd int

	// Platform dependent state of the file descriptor.
	SysFile

	// Whether this is a streaming descriptor, as opposed to a
	// packet-based descriptor like a UDP socket. Immutable.
	IsStream bool

	// Whether a zero byte read indicates EOF. This is false for a
	// message based socket connection.
	ZeroReadIsEOF bool
	// contains filtered or unexported fields
}

FD is a file descriptor. The net and os packages use this type as a field of a larger type representing a network connection or OS file.

func (*FD) Accept

func (fd *FD) Accept() (int, syscall.Sockaddr, string, error)

Accept wraps the accept network call.

func (*FD) Close

func (fd *FD) Close() error

Close closes the FD. The underlying file descriptor is closed by the destroy method when there are no remaining references.

func (*FD) Dup

func (fd *FD) Dup() (int, string, error)

Dup duplicates the file descriptor.

func (*FD) Fchdir

func (fd *FD) Fchdir() error

Fchdir wraps syscall.Fchdir.

func (*FD) Fchmod

func (fd *FD) Fchmod(mode uint32) error

Fchmod wraps syscall.Fchmod.

func (*FD) Fchown

func (fd *FD) Fchown(uid, gid int) error

Fchown wraps syscall.Fchown.

func (*FD) Fstat

func (fd *FD) Fstat(s *syscall.Stat_t) error

Fstat wraps syscall.Fstat

func (*FD) Fsync

func (fd *FD) Fsync() error

Fsync wraps syscall.Fsync.

func (*FD) Ftruncate

func (fd *FD) Ftruncate(size int64) error

Ftruncate wraps syscall.Ftruncate.

func (*FD) Init

func (fd *FD) Init(net string, pollable bool) error

Init initializes the FD. The Sysfd field should already be set. This can be called multiple times on a single FD. The net argument is a network name from the net package (e.g., "tcp"), or "file". Set pollable to true if fd should be managed by runtime netpoll.

func (*FD) Pread

func (fd *FD) Pread(p []byte, off int64) (int, error)

Pread wraps the pread system call.

func (*FD) Pwrite

func (fd *FD) Pwrite(p []byte, off int64) (int, error)

Pwrite wraps the pwrite system call.

func (*FD) RawControl

func (fd *FD) RawControl(f func(uintptr)) error

RawControl invokes the user-defined function f for a non-IO operation.

func (*FD) RawRead

func (fd *FD) RawRead(f func(uintptr) bool) error

RawRead invokes the user-defined function f for a read operation.

func (*FD) RawWrite

func (fd *FD) RawWrite(f func(uintptr) bool) error

RawWrite invokes the user-defined function f for a write operation.

func (*FD) Read

func (fd *FD) Read(p []byte) (int, error)

Read implements io.Reader.

func (*FD) ReadDirent

func (fd *FD) ReadDirent(buf []byte) (int, error)

ReadDirent wraps syscall.ReadDirent. We treat this like an ordinary system call rather than a call that tries to fill the buffer.

func (*FD) ReadFrom

func (fd *FD) ReadFrom(p []byte) (int, syscall.Sockaddr, error)

ReadFrom wraps the recvfrom network call.

func (*FD) ReadFromInet4

func (fd *FD) ReadFromInet4(p []byte, from *syscall.SockaddrInet4) (int, error)

ReadFromInet4 wraps the recvfrom network call for IPv4.

func (*FD) ReadFromInet6

func (fd *FD) ReadFromInet6(p []byte, from *syscall.SockaddrInet6) (int, error)

ReadFromInet6 wraps the recvfrom network call for IPv6.

func (*FD) ReadMsg

func (fd *FD) ReadMsg(p []byte, oob []byte, flags int) (int, int, int, syscall.Sockaddr, error)

ReadMsg wraps the recvmsg network call.

func (*FD) ReadMsgInet4

func (fd *FD) ReadMsgInet4(p []byte, oob []byte, flags int, sa4 *syscall.SockaddrInet4) (int, int, int, error)

ReadMsgInet4 is ReadMsg, but specialized for syscall.SockaddrInet4.

func (*FD) ReadMsgInet6

func (fd *FD) ReadMsgInet6(p []byte, oob []byte, flags int, sa6 *syscall.SockaddrInet6) (int, int, int, error)

ReadMsgInet6 is ReadMsg, but specialized for syscall.SockaddrInet6.

func (*FD) Seek

func (fd *FD) Seek(offset int64, whence int) (int64, error)

Seek wraps syscall.Seek.

func (*FD) SetBlocking

func (fd *FD) SetBlocking() error

SetBlocking puts the file into blocking mode.

func (*FD) SetDeadline

func (fd *FD) SetDeadline(t time.Time) error

SetDeadline sets the read and write deadlines associated with fd.

func (*FD) SetReadDeadline

func (fd *FD) SetReadDeadline(t time.Time) error

SetReadDeadline sets the read deadline associated with fd.

func (*FD) SetWriteDeadline

func (fd *FD) SetWriteDeadline(t time.Time) error

SetWriteDeadline sets the write deadline associated with fd.

func (*FD) Shutdown

func (fd *FD) Shutdown(how int) error

Shutdown wraps syscall.Shutdown.

func (*FD) WaitWrite

func (fd *FD) WaitWrite() error

WaitWrite waits until data can be written to fd.

func (*FD) Write

func (fd *FD) Write(p []byte) (int, error)

Write implements io.Writer.

func (*FD) WriteMsg

func (fd *FD) WriteMsg(p []byte, oob []byte, sa syscall.Sockaddr) (int, int, error)

WriteMsg wraps the sendmsg network call.

func (*FD) WriteMsgInet4

func (fd *FD) WriteMsgInet4(p []byte, oob []byte, sa *syscall.SockaddrInet4) (int, int, error)

WriteMsgInet4 is WriteMsg specialized for syscall.SockaddrInet4.

func (*FD) WriteMsgInet6

func (fd *FD) WriteMsgInet6(p []byte, oob []byte, sa *syscall.SockaddrInet6) (int, int, error)

WriteMsgInet6 is WriteMsg specialized for syscall.SockaddrInet6.

func (*FD) WriteOnce

func (fd *FD) WriteOnce(p []byte) (int, error)

WriteOnce is for testing only. It makes a single write call.

func (*FD) WriteTo

func (fd *FD) WriteTo(p []byte, sa syscall.Sockaddr) (int, error)

WriteTo wraps the sendto network call.

func (*FD) WriteToInet4

func (fd *FD) WriteToInet4(p []byte, sa *syscall.SockaddrInet4) (int, error)

WriteToInet4 wraps the sendto network call for IPv4 addresses.

func (*FD) WriteToInet6

func (fd *FD) WriteToInet6(p []byte, sa *syscall.SockaddrInet6) (int, error)

WriteToInet6 wraps the sendto network call for IPv6 addresses.

type String

type String string

String is an internal string definition for methods/functions that is not intended for use outside the standard libraries.

Other packages in std that import internal/poll and have some exported APIs (now we've got some in net.rawConn) which are only used internally and are not intended to be used outside the standard libraries, Therefore, we make those APIs use internal types like poll.FD or poll.String in their function signatures to disable the usability of these APIs from external codebase.

type SysFile

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