PROTOCOLS
Node
Defined in fuchsia.io/io.fidl
Node defines the minimal interface for entities which can be accessed in a filesystem.
Clone
Create another connection to the same remote object.
flags may be any of:
- OPEN_RIGHT_*
- OPEN_FLAG_APPEND
- OPEN_FLAG_NO_REMOTE
- OPEN_FLAG_DESCRIBE
- CLONE_FLAG_SAME_RIGHTS
All other flags are ignored.
The OPEN_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.
Alternatively, pass CLONE_FLAG_SAME_RIGHTS to inherit the rights on the source connection.
It is invalid to pass any of the OPEN_RIGHT_* flags together with CLONE_FLAG_SAME_RIGHTS.
Request
| Name | Type |
|---|---|
flags |
uint32
|
object |
request<Node>
|
Close
Terminates connection with object.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
Describe
Returns extra information about the type of the object.
If the Describe operation fails, the connection is closed.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
info |
NodeInfo
|
OnOpen
An event produced eagerly by a FIDL server if requested by OPEN_FLAG_DESCRIBE.
Indicates the success or failure of the open operation, and optionally describes the
object. If the status is ZX_OK, info contains descriptive information about the object
(the same as would be returned by Describe).
Response
| Name | Type |
|---|---|
s |
int32
|
info |
NodeInfo?
|
Sync
Synchronizes updates to the node to the underlying media, if it exists.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
GetAttr
Acquires information about the node.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
attributes |
NodeAttributes
|
SetAttr
Updates information about the node.
flags may be any of NODE_ATTRIBUTE_FLAG_*.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
flags |
uint32
|
attributes |
NodeAttributes
|
Response
| Name | Type |
|---|---|
s |
int32
|
Ioctl
Deprecated. Only for use with compatibility with devhost.
Request
| Name | Type |
|---|---|
opcode |
uint32
|
max_out |
uint64
|
handles |
vector<handle>[2]
|
in |
vector<uint8>[8192]
|
Response
| Name | Type |
|---|---|
s |
int32
|
handles |
vector<handle>[2]
|
out |
vector<uint8>[8192]
|
File
Defined in fuchsia.io/io.fidl
File defines the interface of a node which contains a flat layout of data.
Clone
Create another connection to the same remote object.
flags may be any of:
- OPEN_RIGHT_*
- OPEN_FLAG_APPEND
- OPEN_FLAG_NO_REMOTE
- OPEN_FLAG_DESCRIBE
- CLONE_FLAG_SAME_RIGHTS
All other flags are ignored.
The OPEN_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.
Alternatively, pass CLONE_FLAG_SAME_RIGHTS to inherit the rights on the source connection.
It is invalid to pass any of the OPEN_RIGHT_* flags together with CLONE_FLAG_SAME_RIGHTS.
Request
| Name | Type |
|---|---|
flags |
uint32
|
object |
request<Node>
|
Close
Terminates connection with object.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
Describe
Returns extra information about the type of the object.
If the Describe operation fails, the connection is closed.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
info |
NodeInfo
|
OnOpen
An event produced eagerly by a FIDL server if requested by OPEN_FLAG_DESCRIBE.
Indicates the success or failure of the open operation, and optionally describes the
object. If the status is ZX_OK, info contains descriptive information about the object
(the same as would be returned by Describe).
Response
| Name | Type |
|---|---|
s |
int32
|
info |
NodeInfo?
|
Sync
Synchronizes updates to the node to the underlying media, if it exists.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
GetAttr
Acquires information about the node.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
attributes |
NodeAttributes
|
SetAttr
Updates information about the node.
flags may be any of NODE_ATTRIBUTE_FLAG_*.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
flags |
uint32
|
attributes |
NodeAttributes
|
Response
| Name | Type |
|---|---|
s |
int32
|
Ioctl
Deprecated. Only for use with compatibility with devhost.
Request
| Name | Type |
|---|---|
opcode |
uint32
|
max_out |
uint64
|
handles |
vector<handle>[2]
|
in |
vector<uint8>[8192]
|
Response
| Name | Type |
|---|---|
s |
int32
|
handles |
vector<handle>[2]
|
out |
vector<uint8>[8192]
|
Read
Reads 'count' bytes at the seek offset. The seek offset is moved forward by the number of bytes read.
This method requires following rights: OPEN_RIGHT_READABLE.
Request
| Name | Type |
|---|---|
count |
uint64
|
Response
| Name | Type |
|---|---|
s |
int32
|
data |
vector<uint8>[8192]
|
ReadAt
Reads 'count' bytes at the provided offset. Does not affect the seek offset.
This method requires following rights: OPEN_RIGHT_READABLE.
Request
| Name | Type |
|---|---|
count |
uint64
|
offset |
uint64
|
Response
| Name | Type |
|---|---|
s |
int32
|
data |
vector<uint8>[8192]
|
Write
Writes data at the seek offset. The seek offset is moved forward by the number of bytes written.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
data |
vector<uint8>[8192]
|
Response
| Name | Type |
|---|---|
s |
int32
|
actual |
uint64
|
WriteAt
Writes data to the provided offset. Does not affect the seek offset.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
data |
vector<uint8>[8192]
|
offset |
uint64
|
Response
| Name | Type |
|---|---|
s |
int32
|
actual |
uint64
|
Seek
Moves the offset at which the next invocation of Read() or Write() will
occur.
This method does not require any rights.
Request
| Name | Type |
|---|---|
offset |
int64
|
start |
SeekOrigin
|
Response
| Name | Type |
|---|---|
s |
int32
|
offset |
uint64
|
Truncate
Shrinks the file size to 'length' bytes.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
length |
uint64
|
Response
| Name | Type |
|---|---|
s |
int32
|
GetFlags
Acquires the Directory::Open rights and flags used to access this file.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
flags |
uint32
|
SetFlags
Changes the Directory::Open flags used to access the file.
Supported flags which can be turned on / off:
- OPEN_FLAG_APPEND
This method does not require any rights.
Request
| Name | Type |
|---|---|
flags |
uint32
|
Response
| Name | Type |
|---|---|
s |
int32
|
GetBuffer
Acquires a buffer representing this file, if there is one, with the requested access rights.
flags may be any of VMO_FLAG_*.
This method requires following rights:
- OPEN_RIGHT_WRITABLE if flags includes VMO_FLAG_WRITE.
- OPEN_RIGHT_READABLE if flags includes VMO_FLAG_READ or VMO_FLAG_EXEC.
Request
| Name | Type |
|---|---|
flags |
uint32
|
Response
| Name | Type |
|---|---|
s |
int32
|
buffer |
fuchsia.mem/Buffer?
|
DirectoryWatcher
Defined in fuchsia.io/io.fidl
DirectoryWatcher transmits messages from a filesystem server about events happening in the filesystem. Clients can register new watchers using the Directory "Watch" method, where they can filter which events they want to receive notifications for.
OnEvent
Request
| Name | Type |
|---|---|
events |
vector<uint8>[8192]
|
Directory
Defined in fuchsia.io/io.fidl
Directory defines a node which is capable of containing other Objects.
Clone
Create another connection to the same remote object.
flags may be any of:
- OPEN_RIGHT_*
- OPEN_FLAG_APPEND
- OPEN_FLAG_NO_REMOTE
- OPEN_FLAG_DESCRIBE
- CLONE_FLAG_SAME_RIGHTS
All other flags are ignored.
The OPEN_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.
Alternatively, pass CLONE_FLAG_SAME_RIGHTS to inherit the rights on the source connection.
It is invalid to pass any of the OPEN_RIGHT_* flags together with CLONE_FLAG_SAME_RIGHTS.
Request
| Name | Type |
|---|---|
flags |
uint32
|
object |
request<Node>
|
Close
Terminates connection with object.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
Describe
Returns extra information about the type of the object.
If the Describe operation fails, the connection is closed.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
info |
NodeInfo
|
OnOpen
An event produced eagerly by a FIDL server if requested by OPEN_FLAG_DESCRIBE.
Indicates the success or failure of the open operation, and optionally describes the
object. If the status is ZX_OK, info contains descriptive information about the object
(the same as would be returned by Describe).
Response
| Name | Type |
|---|---|
s |
int32
|
info |
NodeInfo?
|
Sync
Synchronizes updates to the node to the underlying media, if it exists.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
GetAttr
Acquires information about the node.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
attributes |
NodeAttributes
|
SetAttr
Updates information about the node.
flags may be any of NODE_ATTRIBUTE_FLAG_*.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
flags |
uint32
|
attributes |
NodeAttributes
|
Response
| Name | Type |
|---|---|
s |
int32
|
Ioctl
Deprecated. Only for use with compatibility with devhost.
Request
| Name | Type |
|---|---|
opcode |
uint32
|
max_out |
uint64
|
handles |
vector<handle>[2]
|
in |
vector<uint8>[8192]
|
Response
| Name | Type |
|---|---|
s |
int32
|
handles |
vector<handle>[2]
|
out |
vector<uint8>[8192]
|
Open
Opens a new object relative to this directory object.
path may contain multiple segments, separated by "/" characters,
and should never be empty i.e. "" is an invalid path.
flags may be any of the OPEN_FLAG_* and OPEN_RIGHT_* values, bitwise ORed together.
The OPEN_FLAG_DESCRIBE flag may cause an OnOpen event to be transmitted
on the object handle, indicating the type of object opened.
If an unknown value is sent for either flags or mode, the connection should be closed.
OPEN_RIGHTS_* flags provided in flags will restrict access rights on the object channel
which will be connected to the opened entity.
Rights are never increased. When you open a nested entity within a directory, you may only
request the same rights as what the directory connection already has, or a subset of those.
Exceeding those rights causes an access denied error to be transmitted in the
OnOpen event if applicable, and the object connection closed.
The caller must specify either one or more of the OPEN_RIGHT_* flags, or
the OPEN_FLAG_NODE_REFERENCE flag.
Request
| Name | Type |
|---|---|
flags |
uint32
|
mode |
uint32
|
path |
string[4096]
|
object |
request<Node>
|
Unlink
Detaches an object from this directory object.
The underlying object may or may not be deleted after this method completes: 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 removed.
If a directory is unlinked while it still has an open reference, it must become read-only, preventing new entries from being created until all references close and the directory is destroyed.
path identifies the file which should be detached.
If path contains multiple segments, separated by "/" characters,
then the directory is traversed, one segment at a time, relative to the
originally accessed Directory.
Returns:
ZX_ERR_ACCESS_DENIED if the connection (or the underlying filesystem) does not
allow writable access.
ZX_ERR_INVALID_ARGS if path contains ".." segments.
ZX_ERR_NOT_EMPTY if path refers to a non-empty directory.
ZX_ERR_UNAVAILABLE if path refers to a mount point, containing a remote channel.
ZX_ERR_UNAVAILABLE if path is ".".
Other errors may be returned for filesystem-specific reasons.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
path |
string[4096]
|
Response
| Name | Type |
|---|---|
s |
int32
|
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.
These dirents are of the form:
struct dirent {
// Describes the inode of the entry.
uint64 ino;
// Describes the length of the dirent name.
uint8 size;
// Describes the type of the entry. Aligned with the
/// POSIX d_type values. Use DIRENT_TYPE_* 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.
Request
| Name | Type |
|---|---|
max_bytes |
uint64
|
Response
| Name | Type |
|---|---|
s |
int32
|
dirents |
vector<uint8>[8192]
|
Rewind
Resets the directory seek offset.
This method does not require any rights, similar to ReadDirents.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
GetToken
Acquires a token to a Directory which can be used to identify access to it at a later point in time.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
token |
handle<handle>?
|
Rename
Renames an object named src to the name dst, in a directory represented by token.
src/dst must be resolved object names. Including "/" in any position
other than the end of the string will return ZX_ERR_INVALID_ARGS.
Returning "/" at the end of either string implies that it must be a
directory, or else ZX_ERR_NOT_DIR should be returned.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
src |
string[4096]
|
dst_parent_token |
handle<handle>
|
dst |
string[4096]
|
Response
| Name | Type |
|---|---|
s |
int32
|
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: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
src |
string[4096]
|
dst_parent_token |
handle<handle>
|
dst |
string[4096]
|
Response
| Name | Type |
|---|---|
s |
int32
|
Watch
Watches a directory, receiving events of added messages on the watcher request channel.
The "watcher" handle will send messages of the form: struct { uint8 event; uint8 len; char name[]; }; Where names are NOT null-terminated.
This API is unstable"; in the future, watcher will be a "DirectoryWatcher" client.
Mask specifies a bitmask of events to observe. Options must be zero; it is reserved.
This method does not require any rights, similar to ReadDirents.
Request
| Name | Type |
|---|---|
mask |
uint32
|
options |
uint32
|
watcher |
handle<channel>
|
Response
| Name | Type |
|---|---|
s |
int32
|
DirectoryAdmin
Defined in fuchsia.io/io.fidl
DirectoryAdmin defines a directory which is capable of handling administrator tasks within the filesystem.
Clone
Create another connection to the same remote object.
flags may be any of:
- OPEN_RIGHT_*
- OPEN_FLAG_APPEND
- OPEN_FLAG_NO_REMOTE
- OPEN_FLAG_DESCRIBE
- CLONE_FLAG_SAME_RIGHTS
All other flags are ignored.
The OPEN_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.
Alternatively, pass CLONE_FLAG_SAME_RIGHTS to inherit the rights on the source connection.
It is invalid to pass any of the OPEN_RIGHT_* flags together with CLONE_FLAG_SAME_RIGHTS.
Request
| Name | Type |
|---|---|
flags |
uint32
|
object |
request<Node>
|
Close
Terminates connection with object.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
Describe
Returns extra information about the type of the object.
If the Describe operation fails, the connection is closed.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
info |
NodeInfo
|
OnOpen
An event produced eagerly by a FIDL server if requested by OPEN_FLAG_DESCRIBE.
Indicates the success or failure of the open operation, and optionally describes the
object. If the status is ZX_OK, info contains descriptive information about the object
(the same as would be returned by Describe).
Response
| Name | Type |
|---|---|
s |
int32
|
info |
NodeInfo?
|
Sync
Synchronizes updates to the node to the underlying media, if it exists.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
GetAttr
Acquires information about the node.
This method does not require any rights.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
attributes |
NodeAttributes
|
SetAttr
Updates information about the node.
flags may be any of NODE_ATTRIBUTE_FLAG_*.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
flags |
uint32
|
attributes |
NodeAttributes
|
Response
| Name | Type |
|---|---|
s |
int32
|
Ioctl
Deprecated. Only for use with compatibility with devhost.
Request
| Name | Type |
|---|---|
opcode |
uint32
|
max_out |
uint64
|
handles |
vector<handle>[2]
|
in |
vector<uint8>[8192]
|
Response
| Name | Type |
|---|---|
s |
int32
|
handles |
vector<handle>[2]
|
out |
vector<uint8>[8192]
|
Open
Opens a new object relative to this directory object.
path may contain multiple segments, separated by "/" characters,
and should never be empty i.e. "" is an invalid path.
flags may be any of the OPEN_FLAG_* and OPEN_RIGHT_* values, bitwise ORed together.
The OPEN_FLAG_DESCRIBE flag may cause an OnOpen event to be transmitted
on the object handle, indicating the type of object opened.
If an unknown value is sent for either flags or mode, the connection should be closed.
OPEN_RIGHTS_* flags provided in flags will restrict access rights on the object channel
which will be connected to the opened entity.
Rights are never increased. When you open a nested entity within a directory, you may only
request the same rights as what the directory connection already has, or a subset of those.
Exceeding those rights causes an access denied error to be transmitted in the
OnOpen event if applicable, and the object connection closed.
The caller must specify either one or more of the OPEN_RIGHT_* flags, or
the OPEN_FLAG_NODE_REFERENCE flag.
Request
| Name | Type |
|---|---|
flags |
uint32
|
mode |
uint32
|
path |
string[4096]
|
object |
request<Node>
|
Unlink
Detaches an object from this directory object.
The underlying object may or may not be deleted after this method completes: 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 removed.
If a directory is unlinked while it still has an open reference, it must become read-only, preventing new entries from being created until all references close and the directory is destroyed.
path identifies the file which should be detached.
If path contains multiple segments, separated by "/" characters,
then the directory is traversed, one segment at a time, relative to the
originally accessed Directory.
Returns:
ZX_ERR_ACCESS_DENIED if the connection (or the underlying filesystem) does not
allow writable access.
ZX_ERR_INVALID_ARGS if path contains ".." segments.
ZX_ERR_NOT_EMPTY if path refers to a non-empty directory.
ZX_ERR_UNAVAILABLE if path refers to a mount point, containing a remote channel.
ZX_ERR_UNAVAILABLE if path is ".".
Other errors may be returned for filesystem-specific reasons.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
path |
string[4096]
|
Response
| Name | Type |
|---|---|
s |
int32
|
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.
These dirents are of the form:
struct dirent {
// Describes the inode of the entry.
uint64 ino;
// Describes the length of the dirent name.
uint8 size;
// Describes the type of the entry. Aligned with the
/// POSIX d_type values. Use DIRENT_TYPE_* 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.
Request
| Name | Type |
|---|---|
max_bytes |
uint64
|
Response
| Name | Type |
|---|---|
s |
int32
|
dirents |
vector<uint8>[8192]
|
Rewind
Resets the directory seek offset.
This method does not require any rights, similar to ReadDirents.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
GetToken
Acquires a token to a Directory which can be used to identify access to it at a later point in time.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
token |
handle<handle>?
|
Rename
Renames an object named src to the name dst, in a directory represented by token.
src/dst must be resolved object names. Including "/" in any position
other than the end of the string will return ZX_ERR_INVALID_ARGS.
Returning "/" at the end of either string implies that it must be a
directory, or else ZX_ERR_NOT_DIR should be returned.
This method requires following rights: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
src |
string[4096]
|
dst_parent_token |
handle<handle>
|
dst |
string[4096]
|
Response
| Name | Type |
|---|---|
s |
int32
|
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: OPEN_RIGHT_WRITABLE.
Request
| Name | Type |
|---|---|
src |
string[4096]
|
dst_parent_token |
handle<handle>
|
dst |
string[4096]
|
Response
| Name | Type |
|---|---|
s |
int32
|
Watch
Watches a directory, receiving events of added messages on the watcher request channel.
The "watcher" handle will send messages of the form: struct { uint8 event; uint8 len; char name[]; }; Where names are NOT null-terminated.
This API is unstable"; in the future, watcher will be a "DirectoryWatcher" client.
Mask specifies a bitmask of events to observe. Options must be zero; it is reserved.
This method does not require any rights, similar to ReadDirents.
Request
| Name | Type |
|---|---|
mask |
uint32
|
options |
uint32
|
watcher |
handle<channel>
|
Response
| Name | Type |
|---|---|
s |
int32
|
Mount
Mount a channel representing a remote filesystem onto this directory.
All future requests to this node will be forwarded to the remote filesystem.
To re-open a node without forwarding to the remote target, the node
should be opened with OPEN_FLAG_NO_REMOTE.
Request
| Name | Type |
|---|---|
remote |
Directory
|
Response
| Name | Type |
|---|---|
s |
int32
|
MountAndCreate
Atomically create a directory with a provided path, and mount the remote handle to the newly created directory.
Request
| Name | Type |
|---|---|
remote |
Directory
|
name |
string[255]
|
flags |
uint32
|
Response
| Name | Type |
|---|---|
s |
int32
|
Unmount
Unmount this filesystem. After this function returns successfully, all connections to the filesystem will be terminated.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
UnmountNode
Detach a node which was previously attached to this directory with Mount.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
remote |
Directory?
|
QueryFilesystem
Query the filesystem for filesystem-specific information.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
info |
FilesystemInfo?
|
GetDevicePath
Acquire the path to the device backing this filesystem, if there is one.
Request
| Name | Type |
|---|
Response
| Name | Type |
|---|---|
s |
int32
|
path |
string[4096]?
|
STRUCTS
Service
Defined in fuchsia.io/io.fidl
The default protocol, interface information must be acquired some other way.
| Name | Type | Description | Default |
|---|
FileObject
Defined in fuchsia.io/io.fidl
The object may be cast to interface 'File'.
| Name | Type | Description | Default |
|---|---|---|---|
event |
handle<event>?
|
An optional event which transmits information about an object's readability or writability. This event relays information about the underlying object, not the capability granted to client: this event may be signalled "readable" on a connection that does not have the capability to read. The "`FILE_SIGNAL_`" values may be observed on this event. | No default |
DirectoryObject
Defined in fuchsia.io/io.fidl
The object may be cast to interface 'Directory'.
| Name | Type | Description | Default |
|---|
Pipe
Defined in fuchsia.io/io.fidl
The object is accompanied by a pipe.
| Name | Type | Description | Default |
|---|---|---|---|
socket |
handle<socket>
|
No default |
Socket
Defined in fuchsia.io/io.fidl
The object is accompanied by a socket.
| Name | Type | Description | Default |
|---|---|---|---|
socket |
handle<socket>
|
No default |
Vmofile
Defined in fuchsia.io/io.fidl
The object is a file which is represented as an immutable VMO. Although a VMO is returned as a part of this structure, this underlying object may represent multiple Vmofiles. To identify the logical portion of the VMO that represents the single file, an offset and length parameter are also supplied.
| Name | Type | Description | Default |
|---|---|---|---|
vmo |
handle<vmo>
|
The VMO which backs this file. | No default |
offset |
uint64
|
The index into `vmo` which represents the first byte of the file. | No default |
length |
uint64
|
The number of bytes, starting at `offset`, which may be used to represent this file. | No default |
Device
Defined in fuchsia.io/io.fidl
The object may be cast to interface 'Device'.
| Name | Type | Description | Default |
|---|---|---|---|
event |
handle<eventpair>?
|
An optional event which transmits information about a device's state. The "`DEVICE_SIGNAL_`" values may be observed on this event. | No default |
Tty
Defined in fuchsia.io/io.fidl
The object may be cast to interface 'Tty'
| Name | Type | Description | Default |
|---|---|---|---|
event |
handle<eventpair>?
|
No default |
NodeAttributes
Defined in fuchsia.io/io.fidl
NodeAttributes defines generic information about a filesystem node.
| Name | Type | Description | Default |
|---|---|---|---|
mode |
uint32
|
Protection bits and node type information describe in 'mode'. | No default |
id |
uint64
|
A filesystem-unique ID. | No default |
content_size |
uint64
|
Node size, in bytes. | No default |
storage_size |
uint64
|
Space needed to store node (possibly larger than size), in bytes. | No default |
link_count |
uint64
|
Hard link count. | No default |
creation_time |
uint64
|
Time of creation (may be updated manually after creation) in ns since Unix epoch, UTC. | No default |
modification_time |
uint64
|
Time of last modification in ns since Unix epoch, UTC. | No default |
WatchedEvent
Defined in fuchsia.io/io.fidl
WatchedEvent describes events returned from a DirectoryWatcher.
| Name | Type | Description | Default |
|---|---|---|---|
event |
uint8
|
No default | |
len |
uint8
|
No default | |
name |
vector<uint8>[255]
|
No default |
FilesystemInfo
Defined in fuchsia.io/io.fidl
| Name | Type | Description | Default |
|---|---|---|---|
total_bytes |
uint64
|
The number of data bytes which may be stored in a filesystem. | No default |
used_bytes |
uint64
|
The number of data bytes which are in use by the filesystem. | No default |
total_nodes |
uint64
|
The number of nodes which may be stored in the filesystem. | No default |
used_nodes |
uint64
|
The number of nodes used by the filesystem. | No default |
free_shared_pool_bytes |
uint64
|
The amount of space which may be allocated from the underlying volume manager. If unsupported, this will be zero. | No default |
fs_id |
uint64
|
A unique identifier for this filesystem instance. Will not be preserved across reboots. | No default |
block_size |
uint32
|
The size of a single filesystem block. | No default |
max_filename_size |
uint32
|
The maximum length of a filesystem name. | No default |
fs_type |
uint32
|
A unique identifier for the type of the underlying filesystem. | No default |
padding |
uint32
|
No default | |
name |
int8[32]
|
No default |
ENUMS
SeekOrigin
Type: uint32
Defined in fuchsia.io/io.fidl
Update the Seek offset.
| Name | Value | Description |
|---|---|---|
START |
0 |
|
CURRENT |
1 |
|
END |
2 |
UNIONS
NodeInfo
Defined in fuchsia.io/io.fidl
Describes how the connection to an should be handled, as well as how to interpret the optional handle.
Refer to Node::Describe() and Node::OnOpen() for usage.
| Name | Type | Description |
|---|---|---|
service |
Service
|
|
file |
FileObject
|
|
directory |
DirectoryObject
|
|
pipe |
Pipe
|
|
vmofile |
Vmofile
|
|
device |
Device
|
|
tty |
Tty
|
|
socket |
Socket
|