Trait DirectoryServerHandler

pub trait DirectoryServerHandler<___T: Transport> {
    // Required methods
    fn advisory_lock(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, AdvisoryLock>,
        responder: Responder<AdvisoryLock>,
    );
    fn clone(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, Clone>,
    );
    fn close(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<Close>,
    );
    fn query(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<Query>,
    );
    fn deprecated_clone(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, DeprecatedClone>,
    );
    fn get_attr(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<GetAttr>,
    );
    fn set_attr(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, SetAttr>,
        responder: Responder<SetAttr>,
    );
    fn deprecated_get_flags(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<DeprecatedGetFlags>,
    );
    fn deprecated_set_flags(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, DeprecatedSetFlags>,
        responder: Responder<DeprecatedSetFlags>,
    );
    fn get_flags(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<GetFlags>,
    );
    fn set_flags(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, SetFlags>,
        responder: Responder<SetFlags>,
    );
    fn query_filesystem(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<QueryFilesystem>,
    );
    fn get_connection_info(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<GetConnectionInfo>,
    );
    fn get_attributes(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, GetAttributes>,
        responder: Responder<GetAttributes>,
    );
    fn update_attributes(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, UpdateAttributes>,
        responder: Responder<UpdateAttributes>,
    );
    fn sync(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<Sync>,
    );
    fn list_extended_attributes(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, ListExtendedAttributes>,
    );
    fn get_extended_attribute(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, GetExtendedAttribute>,
        responder: Responder<GetExtendedAttribute>,
    );
    fn set_extended_attribute(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, SetExtendedAttribute>,
        responder: Responder<SetExtendedAttribute>,
    );
    fn remove_extended_attribute(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, RemoveExtendedAttribute>,
        responder: Responder<RemoveExtendedAttribute>,
    );
    fn deprecated_open(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, DeprecatedOpen>,
    );
    fn open(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, Open>,
    );
    fn read_dirents(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, ReadDirents>,
        responder: Responder<ReadDirents>,
    );
    fn rewind(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<Rewind>,
    );
    fn get_token(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        responder: Responder<GetToken>,
    );
    fn link(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, Link>,
        responder: Responder<Link>,
    );
    fn unlink(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, Unlink>,
        responder: Responder<Unlink>,
    );
    fn rename(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, Rename>,
        responder: Responder<Rename>,
    );
    fn create_symlink(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, CreateSymlink>,
        responder: Responder<CreateSymlink>,
    );
    fn watch(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        request: RequestBuffer<___T, Watch>,
        responder: Responder<Watch>,
    );

    // Provided method
    fn on_unknown_interaction(
        &mut self,
        sender: &ServerSender<___T, Directory>,
        ordinal: u64,
    ) { ... }
}

A server handler for the Directory protocol.

See Directory for more details.

Required Methods

fn advisory_lock( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, AdvisoryLock>, responder: Responder<AdvisoryLock>, )

Acquires an advisory lock on the underlying file.

The lock lasts until either this connection is closed or this method is called with |AdvisoryLockType.UNLOCK| to release the lock explicitly.

Advisory locks are purely advisory. They do not prevent actual read or write operations from occurring on the file, either through this connection or through other connections.

This method requires the following rights:

• [Rights.READ_BYTES] if request.type is [AdvisoryLockType.READ].
• [Rights.WRITE_BYTES] if request.type is [AdvisoryLockType.WRITE].

Errors

• ZX_ERR_BAD_STATE The specified type of lock cannot be acquired. For example, another connection might hold a conflicting lock type.
• ZX_ERR_NOT_SUPPORTED This file does not support advisory locking.
• ZX_ERR_ACCESS_DENIED This connection does not have sufficient rights to acquire the given type of lock.

fn clone( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, Clone>, )

fn close( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<Close>, )

Terminates the connection.

After calling Close, the client must not send any other requests.

Servers, after sending the status response, should close the connection regardless of status and without sending an epitaph.

Closing the client end of the channel should be semantically equivalent to calling Close without knowing when the close has completed or its status.

fn query( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<Query>, )

fn deprecated_clone( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, DeprecatedClone>, )

DEPRECATED - Use fuchsia.unknown/Cloneable.Clone instead.

fn get_attr( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<GetAttr>, )

Acquires information about the node.

This method does not require any rights.

fn set_attr( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, SetAttr>, responder: Responder<SetAttr>, )

Updates information about the node.

Returns ZX_ERR_NOT_SUPPORTED if any attributes specified by [flags] are not supported.

This method requires following rights: OpenFlags.RIGHT_WRITABLE, otherwise returns ZX_ERR_BAD_HANDLE.

fn deprecated_get_flags( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<DeprecatedGetFlags>, )

[DEPRECATED - Use new GetFlags method instead.]

fn deprecated_set_flags( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, DeprecatedSetFlags>, responder: Responder<DeprecatedSetFlags>, )

[DEPRECATED - Use new SetFlags method instead.]

fn get_flags( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<GetFlags>, )

Queries the flags that apply to this node after it has been opened/created. This method does not require any rights.

Note that the final set of flags that apply to the connection may differ from those specified with the fuchsia.io/Directory.Open request used to create it:

• Flags.PERM_INHERIT_*: Only applies when determining connection rights.
• Flags.PROTOCOL_*: Only the protocol of the connection will be present.
• Flags.FLAG_*: Only applies when opening the resource, not part of the connection.

fn set_flags( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, SetFlags>, responder: Responder<SetFlags>, )

Sets the flags that apply to this node after it has been opened. This method does not require any rights.

Only Flags.FILE_APPEND is currently supported. Calling this method without any flags will clear append mode.

Errors:

• ZX_ERR_NOT_SUPPORTED: The object does not support this feature or the specified flags.
• ZX_ERR_INVALID_ARGS: flags other than Flags.FILE_APPEND were specified.

fn query_filesystem( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<QueryFilesystem>, )

Query the filesystem for filesystem-specific information.

fn get_connection_info( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<GetConnectionInfo>, )

Acquires information about the connection.

This method does not require any rights.

fn get_attributes( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, GetAttributes>, responder: Responder<GetAttributes>, )

Acquires information about the node.

The attributes of a node should be stable, independent of the specific protocol used to access it.

If a particular attribute is not applicable or not supported, filesystems should leave the corresponding field absent.

• query a bit-mask specifying which attributes to fetch. The server should not return more than necessary.

• attributes the returned attributes.

This method requires the [Rights.GET_ATTRIBUTES] right.

fn update_attributes( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, UpdateAttributes>, responder: Responder<UpdateAttributes>, )

Updates information about the node.

• attributes the presence of a table field in attributes indicates the intent to update the corresponding attribute.

Returns ZX_ERR_NOT_SUPPORTED if the node does not support any of the specified attributes.

This method requires the [Rights.UPDATE_ATTRIBUTES] right.

fn sync( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<Sync>, )

Synchronizes updates to the node to the underlying media, if it exists.

This method will return when the filesystem server has flushed the relevant updates to the underlying media, but does not guarantee the underlying media has persisted the information, nor that any information is committed to hardware. Clients may use Sync to ensure ordering between operations.

This method does not require any rights.

fn list_extended_attributes( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, ListExtendedAttributes>, )

Creates an iterator over all the extended attribute names associated with this node. If an error occurs it is returned as an epitaph on the iterator request channel, and then the channel is closed.

GetExtendedAttributes can be used with any of these names to retrieve the associated value.

This method requires the [Rights.GET_ATTRIBUTES] right.

fn get_extended_attribute( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, GetExtendedAttribute>, responder: Responder<GetExtendedAttribute>, )

Get the value associated with the given attribute name for this node.

Attribute names have a maximum length of MAX_ATTRIBUTE_NAME. No particular structure is imposed on them.

This method requires the [Rights.GET_ATTRIBUTES] right.

fn set_extended_attribute( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, SetExtendedAttribute>, responder: Responder<SetExtendedAttribute>, )

Set the value for the given attribute name to value for this node.

The attribute name may exist, in which case the attribute is updated. If the attribute doesn’t exist, it is created. The name should have no null bytes in it. If it does, ZX_ERR_INVALID_ARGS is returned.

This method requires the [Rights.UPDATE_ATTRIBUTES] right.

fn remove_extended_attribute( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, RemoveExtendedAttribute>, responder: Responder<RemoveExtendedAttribute>, )

Remove the specified extended attribute.

If the attribute doesn’t exist, ZX_ERR_NOT_FOUND is returned.

This method requires the [Rights.UPDATE_ATTRIBUTES] right.

fn deprecated_open( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, DeprecatedOpen>, )

DEPRECATED - Use fuchsia.io/Directory.Open instead.

fn open( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, Open>, )

Open (or create) a node relative to this directory. Any errors are communicated via an epitaph sent on the object channel.

Errors:

• ZX_ERR_BAD_PATH if path is invalid
• See Flags for other errors which may be communicated based on flags

fn read_dirents( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, ReadDirents>, responder: Responder<ReadDirents>, )

Reads a collection of variably sized dirents into a buffer. The number of dirents in a directory may be very large: akin to calling read multiple times on a file, directories have a seek offset which is updated on subsequent calls to ReadDirents. Each call to ReadDirents will only return whole dirent structures, they will not get split across ReadDirent calls. When the seek offset reaches the end, dirents will be empty.

These dirents are of the form:

struct dirent {
  // Describes the inode of the entry.
  uint64 ino;
  // Describes the length of the dirent name in bytes.
  uint8 size;
  // Describes the type of the entry. Aligned with the
  // POSIX d_type values. Use `DirentType` constants.
  uint8 type;
  // Unterminated name of entry.
  char name[0];
}

This method does not require any rights, since one could always probe for directory contents by triggering name conflicts during file creation.

fn rewind( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<Rewind>, )

Resets the directory seek offset.

This method does not require any rights, similar to ReadDirents.

fn get_token( &mut self, sender: &ServerSender<___T, Directory>, responder: Responder<GetToken>, )

Acquires a token to a Directory which can be used to identify access to it at a later point in time. The token will remain valid for as long as the connection requesting the token remains open.

This method requires following rights: OpenFlags.RIGHT_WRITABLE, otherwise returns ZX_ERR_BAD_HANDLE.

fn link( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, Link>, responder: Responder<Link>, )

Creates a link to an object named src by the name dst, within a directory represented by token.

src must be a resolved object name. Including “/” in the string will return ZX_ERR_INVALID_ARGS.

dst must be a resolved object name. Including “/” in the string will return ZX_ERR_INVALID_ARGS.

This method requires following rights: OpenFlags.RIGHT_WRITABLE and OpenFlags.RIGHT_READABLE, otherwise returns ZX_ERR_BAD_HANDLE.

This will be atomic with respect to renaming or unlinking the source concurrently e.g. if there are two actors operating concurrently, and one actor performs a rename that affects the source within this directory, and the other does a link, each will appear to occur atomically in an unspecified order.

fn unlink( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, Unlink>, responder: Responder<Unlink>, )

Removes a child node from the this directory’s list of entries.

Note: this does not guarantee that the underlying object is destroyed. Although the link will be removed from the containing directory, objects with multiple references (such as files which are still open) will not actually be destroyed until all references are closed.

• error ZX_ERR_ACCESS_DENIED if the connection does not have [Rights.WRITE_BYTES].
• error ZX_ERR_NOT_SUPPORTED if the underlying filesystem does not support writing.
• error ZX_ERR_BAD_PATH if name is invalid.
• error ZX_ERR_NOT_EMPTY if name refers to a non-empty directory.
• error ZX_ERR_UNAVAILABLE if name refers to a mount point, containing a remote channel.
• error ZX_ERR_NOT_DIR if the options requested a directory but something other than a directory was found.

Other errors may be returned for filesystem-specific reasons.

This method requires the following rights:

• [Rights.ENUMERATE]
• [Rights.MODIFY_DIRECTORY]

fn rename( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, Rename>, responder: Responder<Rename>, )

Renames a node named src to the name dst, in a directory represented by dst_parent_token.

src and dst must be valid node names. See Name for what constitutes a valid name.

This method requires the following rights on both the current connection, and the connection identified by dst_parent_token:

• [Rights.ENUMERATE]
• [Rights.MODIFY_DIRECTORY]

The following requirements are necessary to avoid rights escalations.

If the source and destination directory differ, the source directory must also have the maximal set of abilities supported for files, which would typically be [Rights.READ_BYTES], [Rights.WRITE_BYTES], [Rights.GET_ATTRIBUTES] and [Rights.UPDATE_ATTRIBUTES]. Some filesystems might also support the [Rights.EXECUTE] right.

If src refers to a directory, and differs from the destination directory, then the source directory must have also have the [Rights.CONNECT] and [Rights.TRAVERSE] rights.

• error ZX_ERR_INVALID_ARGS if src or dst is invalid.
• error ZX_ERR_ACCESS_DENIED for insufficient rights.

fn create_symlink( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, CreateSymlink>, responder: Responder<CreateSymlink>, )

Creates a symbolic link.

name is the name to be given to the created symbolic link. target is the target of the symbolic link, which has no meaning on the server. The server will perform no validation of target except for a server chosen maximum length. connection is an optional server end of a channel that will speak the Symlink protocol on the successfully created node.

• [Rights.MODIFY_DIRECTORY]

• error ZX_ERR_ALREADY_EXISTS if name already exists.

• error ZX_ERR_BAD_PATH if target exceeds the server length limit for symbolic links.

• error ZX_ERR_INVALID_ARGS if name is not a valid Name.

• error ZX_ERR_NOT_SUPPORTED if creating symbolic links is not supported by the server.

fn watch( &mut self, sender: &ServerSender<___T, Directory>, request: RequestBuffer<___T, Watch>, responder: Responder<Watch>, )

Watches a directory, receiving events of added messages on the watcher request channel.

Options must be zero; it is reserved.

This method does not require any rights, similar to ReadDirents.

Provided Methods

fn on_unknown_interaction( &mut self, sender: &ServerSender<___T, Directory>, ordinal: u64, )

Implementors