ashmem

Documentation

Overview

Package ashmem implements Android ashmem module (Anonymus Shared Memory).

Index

• type Area
  • func (a *Area) ConfigureMMap(ctx context.Context, file *fs.File, opts *memmap.MMapOpts) error
  • func (a *Area) Flush(ctx context.Context, file *fs.File) error
  • func (a *Area) Ioctl(ctx context.Context, io usermem.IO, args arch.SyscallArguments) (uintptr, error)
  • func (a *Area) Read(ctx context.Context, file *fs.File, dst usermem.IOSequence, offset int64) (int64, error)
  • func (a *Area) Release()
  • func (a *Area) Seek(ctx context.Context, file *fs.File, whence fs.SeekWhence, offset int64) (int64, error)
  • func (a *Area) Write(ctx context.Context, file *fs.File, src usermem.IOSequence, offset int64) (int64, error)
• type Device
  • func NewDevice(ctx context.Context, owner fs.FileOwner, fp fs.FilePermissions) *Device
  • func (ad *Device) AddLink()
  • func (ad *Device) Check(ctx context.Context, inode *fs.Inode, p fs.PermMask) bool
  • func (ad *Device) DropLink()
  • func (ad *Device) GetFile(ctx context.Context, d *fs.Dirent, flags fs.FileFlags) (*fs.File, error)
  • func (ad *Device) IsVirtual() bool
  • func (ad *Device) NotifyStatusChange(ctx context.Context)
  • func (ad *Device) Release(context.Context)
  • func (ad *Device) SetOwner(ctx context.Context, inode *fs.Inode, owner fs.FileOwner) error
  • func (ad *Device) SetPermissions(ctx context.Context, inode *fs.Inode, fp fs.FilePermissions) bool
  • func (ad *Device) SetTimestamps(ctx context.Context, inode *fs.Inode, ts fs.TimeSpec) error
  • func (ad *Device) StatFS(context.Context) (fs.Info, error)
  • func (ad *Device) Truncate(ctx context.Context, inode *fs.Inode, size int64) error
  • func (ad *Device) UnstableAttr(ctx context.Context, inode *fs.Inode) (fs.UnstableAttr, error)
• type PinBoard
  • func NewPinBoard() *PinBoard
  • func (pb *PinBoard) PinRange(r Range) bool
  • func (pb *PinBoard) RangePinnedStatus(r Range) bool
  • func (pb *PinBoard) UnpinRange(r Range)

Types

type Area

type Area struct {
	fsutil.NoFsync
	fsutil.DeprecatedFileOperations
	fsutil.NotDirReaddir
	// contains filtered or unexported fields
}

Area implements fs.FileOperations.

func (*Area) ConfigureMMap

func (a *Area) ConfigureMMap(ctx context.Context, file *fs.File, opts *memmap.MMapOpts) error

ConfigureMMap implements fs.FileOperations.ConfigureMMap.

func (*Area) Flush

func (a *Area) Flush(ctx context.Context, file *fs.File) error

Flush implements fs.FileOperations.Flush.

func (*Area) Ioctl

func (a *Area) Ioctl(ctx context.Context, io usermem.IO, args arch.SyscallArguments) (uintptr, error)

Ioctl implements fs.FileOperations.Ioctl.

func (*Area) Read

func (a *Area) Read(ctx context.Context, file *fs.File, dst usermem.IOSequence, offset int64) (int64, error)

Read implements fs.FileOperations.Read.

func (*Area) Release

func (a *Area) Release()

Release implements fs.FileOperations.Release.

func (*Area) Seek

func (a *Area) Seek(ctx context.Context, file *fs.File, whence fs.SeekWhence, offset int64) (int64, error)

Seek implements fs.FileOperations.Seek.

func (*Area) Write

func (a *Area) Write(ctx context.Context, file *fs.File, src usermem.IOSequence, offset int64) (int64, error)

Write implements fs.FileOperations.Write.

type Device

type Device struct {
	fsutil.DeprecatedFileOperations
	fsutil.InodeNoExtendedAttributes
	fsutil.InodeNotDirectory
	fsutil.InodeNotRenameable
	fsutil.InodeNotSocket
	fsutil.InodeNotSymlink
	fsutil.NoFsync
	fsutil.NoMappable
	fsutil.NoopWriteOut
	fsutil.NotDirReaddir
	// contains filtered or unexported fields
}

Device implements fs.InodeOperations.

func NewDevice

func NewDevice(ctx context.Context, owner fs.FileOwner, fp fs.FilePermissions) *Device

NewDevice creates and intializes a Device structure.

func (*Device) AddLink

func (ad *Device) AddLink()

AddLink implements fs.InodeOperations.AddLink.

Ashmem doesn't support links, no-op.

func (*Device) Check

func (ad *Device) Check(ctx context.Context, inode *fs.Inode, p fs.PermMask) bool

Check implements fs.InodeOperations.Check.

func (*Device) DropLink

func (ad *Device) DropLink()

DropLink implements fs.InodeOperations.DropLink.

Ashmem doesn't support links, no-op.

func (*Device) GetFile

func (ad *Device) GetFile(ctx context.Context, d *fs.Dirent, flags fs.FileFlags) (*fs.File, error)

GetFile implements fs.InodeOperations.GetFile.

func (*Device) IsVirtual

func (ad *Device) IsVirtual() bool

IsVirtual implements fs.InodeOperations.IsVirtual.

Ashmem is virtual.

func (*Device) NotifyStatusChange

func (ad *Device) NotifyStatusChange(ctx context.Context)

NotifyStatusChange implements fs.InodeOperations.NotifyStatusChange.

func (*Device) Release

func (ad *Device) Release(context.Context)

Release implements fs.InodeOperations.Release.

func (*Device) SetOwner

func (ad *Device) SetOwner(ctx context.Context, inode *fs.Inode, owner fs.FileOwner) error

SetOwner implements fs.InodeOperations.SetOwner.

func (*Device) SetPermissions

func (ad *Device) SetPermissions(ctx context.Context, inode *fs.Inode, fp fs.FilePermissions) bool

SetPermissions implements fs.InodeOperations.SetPermissions.

func (*Device) SetTimestamps

func (ad *Device) SetTimestamps(ctx context.Context, inode *fs.Inode, ts fs.TimeSpec) error

SetTimestamps implements fs.InodeOperations.SetTimestamps.

func (*Device) StatFS

func (ad *Device) StatFS(context.Context) (fs.Info, error)

StatFS implements fs.InodeOperations.StatFS.

Ashmem doesn't support querying for filesystem info.

func (*Device) Truncate

func (ad *Device) Truncate(ctx context.Context, inode *fs.Inode, size int64) error

Truncate implements fs.InodeOperations.WriteOut.

Ignored by ashmem.

func (*Device) UnstableAttr

func (ad *Device) UnstableAttr(ctx context.Context, inode *fs.Inode) (fs.UnstableAttr, error)

UnstableAttr implements fs.InodeOperations.UnstableAttr.

type PinBoard

type PinBoard struct {
	Set
}

PinBoard represents a set of pinned ranges in ashmem.

segment.Set is used for implementation where segments represent ranges of pinned bytes, while gaps represent ranges of unpinned bytes. All ranges are page-aligned.

func NewPinBoard

func NewPinBoard() *PinBoard

NewPinBoard creates a new pin board with all pages pinned.

func (*PinBoard) PinRange

func (pb *PinBoard) PinRange(r Range) bool

PinRange pins all pages in the specified range and returns true if there are any newly pinned pages.

func (*PinBoard) RangePinnedStatus

func (pb *PinBoard) RangePinnedStatus(r Range) bool

RangePinnedStatus returns false if there's at least one unpinned page in the specified range.

func (*PinBoard) UnpinRange

func (pb *PinBoard) UnpinRange(r Range)

UnpinRange unpins all pages in the specified range.