Go: internal/poll Index | Files

package poll

import "internal/poll"

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.


Package Files

copy_file_range_linux.go errno_unix.go fcntl_syscall.go fd.go fd_fsync_posix.go fd_mutex.go fd_poll_runtime.go fd_posix.go fd_unix.go fd_writev_unix.go hook_cloexec.go hook_unix.go sendfile_linux.go sock_cloexec.go sockopt.go sockopt_linux.go sockopt_unix.go sockoptip.go splice_linux.go writev.go


var Accept4Func func(int, int) (int, syscall.Sockaddr, error) = syscall.Accept4

Accept4Func is used to hook the accept4 call.

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 = errors.New("use of closed network connection")

ErrNetClosing is returned when a network descriptor is used after it has been closed. Keep this string consistent because of issue #4373: since historically programs have not been able to detect this error, they look for the string.

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 TestHookDidWritev = func(wrote int) {}

TestHookDidWritev is a hook for testing writev.

func CopyFileRange Uses

func CopyFileRange(dst, src *FD, remain int64) (written int64, handled bool, err error)

CopyFileRange copies at most remain bytes of data from src to dst, using the copy_file_range system call. dst and src must refer to regular files.

func DupCloseOnExec Uses

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

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

func IsPollDescriptor Uses

func IsPollDescriptor(fd uintptr) bool

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

func SendFile Uses

func SendFile(dstFD *FD, src int, remain int64) (int64, error)

SendFile wraps the sendfile system call.

func Splice Uses

func Splice(dst, src *FD, remain int64) (written int64, handled bool, sc string, err error)

Splice transfers at most remain bytes of data from src to dst, using the splice system call to minimize copies of data from and to userspace.

Splice creates a temporary pipe, to serve as a buffer for the data transfer. src and dst must both be stream-oriented sockets.

If err != nil, sc is the system call which caused the error.

type DeadlineExceededError Uses

type DeadlineExceededError struct{}

DeadlineExceededError is returned for an expired deadline.

func (*DeadlineExceededError) Error Uses

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 Uses

func (e *DeadlineExceededError) Temporary() bool

func (*DeadlineExceededError) Timeout Uses

func (e *DeadlineExceededError) Timeout() bool

type FD Uses

type FD struct {

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

    // 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 Uses

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

Accept wraps the accept network call.

func (*FD) Close Uses

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 Uses

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

Dup duplicates the file descriptor.

func (*FD) Fchdir Uses

func (fd *FD) Fchdir() error

Fchdir wraps syscall.Fchdir.

func (*FD) Fchmod Uses

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

Fchmod wraps syscall.Fchmod.

func (*FD) Fchown Uses

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

Fchown wraps syscall.Fchown.

func (*FD) Fstat Uses

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

Fstat wraps syscall.Fstat

func (*FD) Fsync Uses

func (fd *FD) Fsync() error

Fsync wraps syscall.Fsync.

func (*FD) Ftruncate Uses

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

Ftruncate wraps syscall.Ftruncate.

func (*FD) Init Uses

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 Uses

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

Pread wraps the pread system call.

func (*FD) Pwrite Uses

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

Pwrite wraps the pwrite system call.

func (*FD) RawControl Uses

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

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

func (*FD) RawRead Uses

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

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

func (*FD) RawWrite Uses

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

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

func (*FD) Read Uses

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

Read implements io.Reader.

func (*FD) ReadDirent Uses

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 Uses

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

ReadFrom wraps the recvfrom network call.

func (*FD) ReadMsg Uses

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

ReadMsg wraps the recvmsg network call.

func (*FD) Seek Uses

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

Seek wraps syscall.Seek.

func (*FD) SetBlocking Uses

func (fd *FD) SetBlocking() error

SetBlocking puts the file into blocking mode.

func (*FD) SetDeadline Uses

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

SetDeadline sets the read and write deadlines associated with fd.

func (*FD) SetReadDeadline Uses

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

SetReadDeadline sets the read deadline associated with fd.

func (*FD) SetWriteDeadline Uses

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

SetWriteDeadline sets the write deadline associated with fd.

func (*FD) SetsockoptByte Uses

func (fd *FD) SetsockoptByte(level, name int, arg byte) error

SetsockoptByte wraps the setsockopt network call with a byte argument.

func (*FD) SetsockoptIPMreq Uses

func (fd *FD) SetsockoptIPMreq(level, name int, mreq *syscall.IPMreq) error

SetsockoptIPMreq wraps the setsockopt network call with an IPMreq argument.

func (*FD) SetsockoptIPMreqn Uses

func (fd *FD) SetsockoptIPMreqn(level, name int, mreq *syscall.IPMreqn) error

SetsockoptIPMreqn wraps the setsockopt network call with an IPMreqn argument.

func (*FD) SetsockoptIPv6Mreq Uses

func (fd *FD) SetsockoptIPv6Mreq(level, name int, mreq *syscall.IPv6Mreq) error

SetsockoptIPv6Mreq wraps the setsockopt network call with an IPv6Mreq argument.

func (*FD) SetsockoptInet4Addr Uses

func (fd *FD) SetsockoptInet4Addr(level, name int, arg [4]byte) error

SetsockoptInet4Addr wraps the setsockopt network call with an IPv4 address.

func (*FD) SetsockoptInt Uses

func (fd *FD) SetsockoptInt(level, name, arg int) error

SetsockoptInt wraps the setsockopt network call with an int argument.

func (*FD) SetsockoptLinger Uses

func (fd *FD) SetsockoptLinger(level, name int, l *syscall.Linger) error

SetsockoptLinger wraps the setsockopt network call with a Linger argument.

func (*FD) Shutdown Uses

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

Shutdown wraps syscall.Shutdown.

func (*FD) WaitWrite Uses

func (fd *FD) WaitWrite() error

WaitWrite waits until data can be read from fd.

func (*FD) Write Uses

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

Write implements io.Writer.

func (*FD) WriteMsg Uses

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

WriteMsg wraps the sendmsg network call.

func (*FD) WriteOnce Uses

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

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

func (*FD) WriteTo Uses

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

WriteTo wraps the sendto network call.

func (*FD) Writev Uses

func (fd *FD) Writev(v *[][]byte) (int64, error)

Writev wraps the writev system call.

Package poll imports 8 packages (graph) and is imported by 14 packages. Updated 2020-12-11. Refresh now. Tools for package owners.