Struct fidl_fuchsia_io::FileSynchronousProxy

pub struct FileSynchronousProxy { /* private fields */ }

Implementations

impl FileSynchronousProxy

pub fn new(channel: Channel) -> Self

pub fn into_channel(self) -> Channel

pub fn wait_for_event(&self, deadline: Time) -> Result<FileEvent, Error>

Waits until an event arrives and returns it. It is safe for other threads to make concurrent requests while waiting for an event.

pub fn advisory_lock( &self, request: &AdvisoryLockRequest, ___deadline: Time ) -> Result<AdvisoryLockingAdvisoryLockResult, Error>

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.

pub fn link_into( &self, dst_parent_token: Event, dst: &str, ___deadline: Time ) -> Result<LinkableLinkIntoResult, Error>

Creates a link to this this object with name dst in the directory represented by dst_parent_token.

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

This method requires the maximal set of rights supported by the filesystem for this object. For files this 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. Insufficient rights will result in ZX_ERR_ACCESS_DENIED.

If this object has no links, it will fail with ZX_ERR_NOT_FOUND.

This method does not have the same atomicity properties has the Directory::Link method, which means that calling Open then LinkInto is not equivalent to Directory::Link because LinkInto will not prevent the source from being renamed or unlinked.

pub fn clone( &self, flags: OpenFlags, object: ServerEnd<NodeMarker> ) -> Result<(), Error>

Create another connection to the same remote object.

flags may be any of:

• OpenFlags.RIGHT_*
• OpenFlags.APPEND
• OpenFlags.DESCRIBE
• OpenFlags.CLONE_SAME_RIGHTS

All other flags are ignored.

The OpenFlags.RIGHT_* bits in flags request corresponding rights over the resulting cloned object. The cloned object must have rights less than or equal to the original object, otherwise returns ZX_ERR_ACCESS_DENIED. Alternatively, pass OpenFlags.CLONE_SAME_RIGHTS to inherit the rights on the source connection. It is invalid to pass any of the OpenFlags.RIGHT_* flags together with OpenFlags.CLONE_SAME_RIGHTS.

pub fn get_attr( &self, ___deadline: Time ) -> Result<(i32, NodeAttributes), Error>

Acquires information about the node.

This method does not require any rights.

pub fn set_attr( &self, flags: NodeAttributeFlags, attributes: &NodeAttributes, ___deadline: Time ) -> Result<i32, Error>

Updates information about the node.

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

pub fn get_flags(&self, ___deadline: Time) -> Result<(i32, OpenFlags), Error>

Acquires the Directory.Open rights and flags used to access this file.

This method does not require any rights.

pub fn set_flags( &self, flags: OpenFlags, ___deadline: Time ) -> Result<i32, Error>

Changes the Directory.Open flags used to access the file. Supported flags which can be turned on / off:

• OpenFlags.APPEND

This method does not require any rights.

pub fn query_filesystem( &self, ___deadline: Time ) -> Result<(i32, Option<Box<FilesystemInfo>>), Error>

Query the filesystem for filesystem-specific information.

pub fn close(&self, ___deadline: Time) -> Result<CloseableCloseResult, Error>

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.

pub fn query(&self, ___deadline: Time) -> Result<Vec<u8>, Error>

pub fn reopen( &self, rights_request: &RightsRequest, object_request: ServerEnd<NodeMarker> ) -> Result<(), Error>

Creates another connection to the same node.

pub fn get_connection_info( &self, ___deadline: Time ) -> Result<ConnectionInfo, Error>

Acquires information about the connection.

This method does not require any rights.

pub fn get_attributes( &self, query: NodeAttributesQuery, ___deadline: Time ) -> Result<Node2GetAttributesResult, Error>

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.

pub fn update_attributes( &self, payload: &MutableNodeAttributes, ___deadline: Time ) -> Result<Node2UpdateAttributesResult, Error>

Updates information about the node.

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

This method requires the [Rights.UPDATE_ATTRIBUTES] right.

pub fn sync(&self, ___deadline: Time) -> Result<Node2SyncResult, Error>

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.

pub fn list_extended_attributes( &self, iterator: ServerEnd<ExtendedAttributeIteratorMarker> ) -> Result<(), Error>

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.

pub fn get_extended_attribute( &self, name: &[u8], ___deadline: Time ) -> Result<Node2GetExtendedAttributeResult, Error>

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.

pub fn set_extended_attribute( &self, name: &[u8], value: ExtendedAttributeValue, mode: SetExtendedAttributeMode, ___deadline: Time ) -> Result<Node2SetExtendedAttributeResult, Error>

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.

pub fn remove_extended_attribute( &self, name: &[u8], ___deadline: Time ) -> Result<Node2RemoveExtendedAttributeResult, Error>

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.

pub fn read( &self, count: u64, ___deadline: Time ) -> Result<ReadableReadResult, Error>

Reads up to ‘count’ bytes at the seek offset. The seek offset is moved forward by the number of bytes read.

Invariants

• The returned data.length will never be greater than count.
• If data.length is less than count, it means that the seek offset has reached the end of file as part of this operation.
• If data.length is zero while count is not, it means that the seek offset is already at or beyond the end of file, and no data could be read.
• If count is zero, the server should perform all the checks ensuring read access without actually read anything, and return an empty data vector.

This method requires the [Rights.READ_BYTES] right.

Returns ZX_ERR_OUT_OF_RANGE if count is greater than MAX_TRANSFER_SIZE.

pub fn write( &self, data: &[u8], ___deadline: Time ) -> Result<WritableWriteResult, Error>

Writes data at the seek offset. The seek offset is moved forward by the number of bytes written. If the file is in append mode, the seek offset is first set to the end of the file, followed by the write, in one atomic step.

The file size may grow if the seek offset plus data.length is beyond the current end of file.

• request data the byte buffer to write to the file.

• response actual_count the number of bytes written.

Invariants

• The returned actual_count will never be greater than data.length.
• If the server is unable to write all the data due to e.g. not enough space, actual_count may be less than data.length. If no bytes could be written, an error is returned.
• If data.length is zero, the server should perform all the checks ensuring write access without mutating the file and return a successful write of zero bytes. The seek offset is still updated if in append mode.

This method requires the [Rights.WRITE_BYTES] right.

pub fn describe(&self, ___deadline: Time) -> Result<FileInfo, Error>

pub fn seek( &self, origin: SeekOrigin, offset: i64, ___deadline: Time ) -> Result<FileSeekResult, Error>

Moves the offset at which the next invocation of [Read] or [Write] will occur. The seek offset is specific to each file connection.

• request origin the reference point where offset will be based on.
• request offset the number of bytes to seek.

• response offset_from_start the adjusted seek offset, from the start of the file.

This method does not require any rights.

pub fn read_at( &self, count: u64, offset: u64, ___deadline: Time ) -> Result<FileReadAtResult, Error>

Reads up to ‘count’ bytes at the provided offset. Does not affect the seek offset.

Invariants

• The returned data.length will never be greater than count.
• If data.length is less than count, it means that ReadAt has hit the end of file as part of this operation.
• If data.length is zero while count is not, it means that offset is at or past the end of file, and no data can be read.
• If count is zero, the server should perform all the checks ensuring read access without actually reading anything, and return an empty data vector.

This method requires the [Rights.READ_BYTES] right.

Returns ZX_ERR_OUT_OF_RANGE if count is greater than MAX_TRANSFER_SIZE.

pub fn write_at( &self, data: &[u8], offset: u64, ___deadline: Time ) -> Result<FileWriteAtResult, Error>

Writes data at the provided offset. Does not affect the seek offset.

The file size may grow if offset plus data.length is past the current end of file.

• request data the byte buffer to write to the file.
• request offset the offset from start of the file to begin writing.

• response actual_count the number of bytes written.

Invariants

• The returned actual_count will never be greater than data.length.
• If the server is unable to write all the data due to e.g. not enough space, actual_count may be less than data.length. If no bytes could be written, an error is returned.
• If data.length is zero, the server should perform all the checks ensuring write access without mutating the file, and will return a successful write of zero bytes.

This method requires the [Rights.WRITE_BYTES] right.

pub fn resize( &self, length: u64, ___deadline: Time ) -> Result<FileResizeResult, Error>

Shrinks or grows the file size to ‘length’ bytes.

If file size is reduced by this operation, the extra trailing data’ is discarded. If file size is increased by this operation, the extended area appears as if it was zeroed.

This method requires the [Rights.WRITE_BYTES] right.

pub fn get_backing_memory( &self, flags: VmoFlags, ___deadline: Time ) -> Result<FileGetBackingMemoryResult, Error>

Acquires a [zx.Handle:VMO] representing this file, if there is one, with the requested access rights.

Implementations are not required to implement files backed by VMOs so this request may fail. Additionally, implementations may only support a certain subset of the flags. Clients should be prepared with fallback behavior if this request fails.

If a client specifies neither PRIVATE_CLONE nor SHARED_BUFFER, the implementation is free to choose the semantics of the returned VMO.

• request flags a VmoFlags indicating the desired mode of access.

• response vmo the requested [zx.Handle:VMO].

• error a [zx.Status] value indicating the failure.

This method requires the following rights:

• [Rights.READ_BYTES] if flags includes [VmoFlags.READ].
• [Rights.WRITE_BYTES] if flags includes [VmoFlags.WRITE].
• [Rights.EXECUTE] if flags includes [VmoFlags.EXECUTE].

pub fn allocate( &self, offset: u64, length: u64, mode: AllocateMode, ___deadline: Time ) -> Result<FileAllocateResult, Error>

Pre-allocate on-disk space for this file.

pub fn enable_verity( &self, options: &VerificationOptions, ___deadline: Time ) -> Result<FileEnableVerityResult, Error>

Enables verification for the file (permanently) which involves computing a merkle tree for the file. Forces a flush prior to building the merkle tree to ensure cached data is captured. Future reads will be verified against the computed merkle tree and writes will be rejected. This method can take some time to complete as it depends on the size of the file. This method can be aborted by closing the connection that this method was issued on.

This method requires the [Rights.UPDATE_ATTRIBUTES] right. Returns ZX_ERR_NOT_SUPPORTED if the filesystem does not support verity. Returns ZX_ERR_ALREADY_EXISTS if the file was already fsverity-enabled. Also returns any error that might arise from reading the file, or from flushing the file, such as ZX_ERR_IO.

Trait Implementations

impl Debug for FileSynchronousProxy

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl SynchronousProxy for FileSynchronousProxy

type Proxy = FileProxy

The async proxy for the same protocol.

type Protocol = FileMarker

The protocol which this Proxy controls.

fn from_channel(inner: Channel) -> Self

Create a proxy over the given channel.

fn into_channel(self) -> Channel

Convert the proxy back into a channel.

fn as_channel(&self) -> &Channel

Get a reference to the proxy’s underlying channel.