package eventfd

import "gvisor.dev/gvisor/pkg/sentry/fsimpl/eventfd"

Package eventfd implements event fds.

Index ¶

• func New(ctx context.Context, vfsObj *vfs.VirtualFilesystem, initVal uint64, semMode bool, flags uint32) (*vfs.FileDescription, error)
• func NewFromHost(ctx context.Context, vfsObj *vfs.VirtualFilesystem, hostfd int, flags uint32) (*vfs.FileDescription, error)
• type EventFileDescription
• func (efd *EventFileDescription) Epollable() bool
• func (efd *EventFileDescription) EventRegister(entry *waiter.Entry) error
• func (efd *EventFileDescription) EventUnregister(entry *waiter.Entry)
• func (efd *EventFileDescription) HostFD() (int, error)
• func (efd *EventFileDescription) Read(ctx context.Context, dst usermem.IOSequence, _ vfs.ReadOptions) (int64, error)
• func (efd *EventFileDescription) Readiness(mask waiter.EventMask) waiter.EventMask
• func (efd *EventFileDescription) Release(context.Context)
• func (efd *EventFileDescription) Signal(val uint64) error
• func (efd *EventFileDescription) Write(ctx context.Context, src usermem.IOSequence, _ vfs.WriteOptions) (int64, error)

Functions ¶

func New ¶

func New(ctx context.Context, vfsObj *vfs.VirtualFilesystem, initVal uint64, semMode bool, flags uint32) (*vfs.FileDescription, error)

New creates a new event fd.

func NewFromHost ¶

func NewFromHost(ctx context.Context, vfsObj *vfs.VirtualFilesystem, hostfd int, flags uint32) (*vfs.FileDescription, error)

NewFromHost creates a new event fd from the given host fd.

Types ¶

type EventFileDescription ¶

type EventFileDescription struct {
	vfs.FileDescriptionDefaultImpl
	vfs.DentryMetadataFileDescriptionImpl
	vfs.NoLockFD
	// contains filtered or unexported fields
}

EventFileDescription implements vfs.FileDescriptionImpl for file-based event notification (eventfd). Eventfds are usually internal to the Sentry but in certain situations they may be converted into a host-backed eventfd.

+stateify savable

func (*EventFileDescription) Epollable ¶

func (efd *EventFileDescription) Epollable() bool

Epollable implements FileDescriptionImpl.Epollable.

func (*EventFileDescription) EventRegister ¶

func (efd *EventFileDescription) EventRegister(entry *waiter.Entry) error

EventRegister implements waiter.Waitable.EventRegister.

func (*EventFileDescription) EventUnregister ¶

func (efd *EventFileDescription) EventUnregister(entry *waiter.Entry)

EventUnregister implements waiter.Waitable.EventUnregister.

func (*EventFileDescription) HostFD ¶

func (efd *EventFileDescription) HostFD() (int, error)

HostFD returns the host eventfd associated with this event.

func (*EventFileDescription) Read ¶

func (efd *EventFileDescription) Read(ctx context.Context, dst usermem.IOSequence, _ vfs.ReadOptions) (int64, error)

Read implements vfs.FileDescriptionImpl.Read.

func (*EventFileDescription) Readiness ¶

func (efd *EventFileDescription) Readiness(mask waiter.EventMask) waiter.EventMask

Readiness implements waiter.Waitable.Readiness.

func (*EventFileDescription) Release ¶

func (efd *EventFileDescription) Release(context.Context)

Release implements vfs.FileDescriptionImpl.Release.

func (*EventFileDescription) Signal ¶

func (efd *EventFileDescription) Signal(val uint64) error

Signal is an internal function to signal the event fd.

func (*EventFileDescription) Write ¶

func (efd *EventFileDescription) Write(ctx context.Context, src usermem.IOSequence, _ vfs.WriteOptions) (int64, error)

Write implements vfs.FileDescriptionImpl.Write.

Source Files ¶

eventfd.go save_restore.go