PROTOCOLS
Binder
Defined in fuchsia.component/binder.fidl
A framework-provided protocol that allows components that use it to bind to the component that exposes it. The act of connecting to this protocol will trigger the bind. Thus, this protocol contains no methods. For more details on binding, see https://fuchsia.dev/fuchsia-src/concepts/components/v2/lifecycle#binding.
When a component connects to protocol, the component exposing this capability will be started if it's not already running. Upon a failure to start, the component framework will close the server end of the channel with a zx.Status epitaph.
ChildIterator
Defined in fuchsia.component/realm.fidl
A protocol to iterate over the list of children in a realm.
Next
Advance the iterator and return the next batch of children.
Returns a vector of ChildRef. Returns an empty vector when there are no more children.
Request
<EMPTY>
Response
| Name | Type |
|---|---|
children | vector<fuchsia.component.decl/ChildRef>:128 |
Controller
Defined in fuchsia.component/controller.fidl
A protocol used to operate on a component.
One may get access to a Controller when creating a component with the Realm.CreateChild method. You may also obtain a Controller for an existing child component with the Realm.OpenController method.
Destroy
Destroys this component. When this method returns, either:
- Ok was returned, indicating destruction has begun.
- An error was returned, and destruction will not be attempted.
If Ok was returned, destruction will proceed in the background, but it hasn't necessarily completed yet. When it completes, the framework will close this [Controller] channel.
Errors:
ACCESS_DENIED: Destruction of this component is not allowed. Currently, this can happen if the component is a static child of its parent.
Request
<EMPTY>
Response
| Name | Type |
|---|---|
payload | Controller_Destroy_Result |
GetExposedDictionary
Returns the dictionary containing the component's exposed capabilities.
Request
<EMPTY>
Response
| Name | Type |
|---|---|
payload | Controller_GetExposedDictionary_Result |
IsStarted
Returns true if this instance is currently running.
Request
<EMPTY>
Response
| Name | Type |
|---|---|
payload | Controller_IsStarted_Result |
Start
Start the component, optionally providing additional handles to be given to the component. Returns INSTANCE_ALREADY_RUNNING if the instance is currently running.
Request
| Name | Type |
|---|---|
args | StartChildArgs |
execution_controller | server_end:ExecutionController |
Response
| Name | Type |
|---|---|
payload | Controller_Start_Result |
EventStream
Defined in fuchsia.component/events.fidl
Listener for events on the component hierarchy. Can't be used outside of the platform.
GetNext
Request
<EMPTY>
Response
| Name | Type |
|---|---|
events | vector<Event> |
WaitForReady
Returns immediately. Used to indicate that the FIDL connection completed. This is needed for non-static streams to verify that subscribe has completed before components are started.
Request
<EMPTY>
Response
<EMPTY>
ExecutionController
Defined in fuchsia.component/controller.fidl
OnStop
When the child is stopped due to Stop being called, the child exiting on its own, or for any other reason, OnStop is called and then this channel is closed.
Response
| Name | Type |
|---|---|
stopped_payload | StoppedPayload |
Stop
Initiates a stop action on this component. Once complete, OnStop will be called with the stopped payload and this channel is closed.
Note that a component may stop running on its own at any time, so it is possible for OnStop to be received before Stop is called.
Request
<EMPTY>
Introspector
Defined in fuchsia.component/introspector.fidl
A protocol used by a component instance to obtain information about components in its own realm.
This protocol only supports getting the moniker at the moment but could expand to other privileged information such as the URL of a component.
The component framework provides this capability to components that use fuchsia.component.Introspector from framework.
GetMoniker
Obtains the moniker relative to this realm of the component corresponding to the provided token. Runners may obtain the token via fuchsia.component.runner/ComponentStartInfo.component_instance.
Returns Error.INSTANCE_NOT_FOUND if the token is invalid, or does not correspond to a component under this realm.
Request
| Name | Type |
|---|---|
component_instance | handle<event> |
Response
| Name | Type |
|---|---|
payload | Introspector_GetMoniker_Result |
Namespace
Defined in fuchsia.component/namespace.fidl
Protocol for performing namespace operations.
Create
Request
| Name | Type |
|---|---|
entries | vector<NamespaceInputEntry> |
Response
| Name | Type |
|---|---|
payload | Namespace_Create_Result |
Realm
Defined in fuchsia.component/realm.fidl
A protocol used by a component instance to manage its own realm, such as for binding to its children.
Requests to this protocol are processed in the order they are received. Clients that wish to send requests in parallel should open multiple connections.
The component framework provides this service to components that use fuchsia.component.Realm.
CreateChild
Creates a child component instance dynamically. When this function returns successfully, the instance exists, but it may not be running.
The environment of the child instance is determined by the environment of the collection. decl must not set environment.
If decl.startup == EAGER, or collection.durability == SINGLE_RUN, [CreateChild] will start the component and return once the component is started. Otherwise, [CreateChild] will return immediately after creating the component and will not start or resolve it.
Errors:
INVALID_ARGUMENTS:collectionis not a valid reference orchildis not a valid declaration.COLLECTION_NOT_FOUND:collectiondoes not exist.INSTANCE_ALREADY_EXISTS:decl.namealready exists incollection.INSTANCE_CANNOT_RESOLVE:child's component declaration failed to resolve in aSingleRuncollection.NO_SPACE: Could not allocate storage for the new instance.INSTANCE_DIED: This realm no longer exists.
Request
| Name | Type |
|---|---|
collection | fuchsia.component.decl/CollectionRef |
decl | fuchsia.component.decl/Child |
args | CreateChildArgs |
Response
| Name | Type |
|---|---|
payload | Realm_CreateChild_Result |
DestroyChild
Destroys a dynamically-created component instance. When this function returns, the instance is destroyed and has stopped running. However, cleanup of the component's resources (such as its isolated storage) may happen in the background after this function returns.
Errors:
INVALID_ARGUMENTS:childis not a valid reference or does not refer to a dynamic instance.INSTANCE_NOT_FOUND:childdoes not exist.COLLECTION_NOT_FOUND:collectiondoes not exist.INSTANCE_DIED: This realm no longer exists.
Request
| Name | Type |
|---|---|
child | fuchsia.component.decl/ChildRef |
Response
| Name | Type |
|---|---|
payload | Realm_DestroyChild_Result |
GetChildOutputDictionary
Request
| Name | Type |
|---|---|
child | fuchsia.component.decl/ChildRef |
Response
| Name | Type |
|---|---|
payload | Realm_GetChildOutputDictionary_Result |
GetResolvedInfo
Returns the set of information that was given to the component framework by this component's resolver.
Request
<EMPTY>
Response
| Name | Type |
|---|---|
payload | Realm_GetResolvedInfo_Result |
ListChildren
Returns an iterator that lists all instances in a collection.
NOTE: The results are not guaranteed to be consistent. Instances may be created or destroyed while the iterator is live, but those changes won't be observed by the iterator after this method returns.
Errors:
INVALID_ARGUMENTS:collectionis not a valid reference oriterdoes not haveZX_RIGHT_WAIT.COLLECTION_NOT_FOUND:collectiondoes not exist.INSTANCE_DIED: This realm no longer exists.- If
iterdoes not have standard channel rights, this function may returnACCESS_DENIEDor component manager may closeiter.
Request
| Name | Type |
|---|---|
collection | fuchsia.component.decl/CollectionRef |
iter | server_end:ChildIterator |
Response
| Name | Type |
|---|---|
payload | Realm_ListChildren_Result |
OpenController
Operate on a child component. See documentation for Controller.
Errors:
INVALID_ARGUMENTS:childis not a valid child reference.INSTANCE_NOT_FOUND:childdoes not exist.INSTANCE_DIED: This realm no longer exists.
Request
| Name | Type |
|---|---|
child | fuchsia.component.decl/ChildRef |
controller | server_end:Controller |
Response
| Name | Type |
|---|---|
payload | Realm_OpenController_Result |
OpenExposedDir
Opens the exposed directory of a child component instance. When this function successfully returns, exposed_dir is bound to a directory that contains the capabilities which the child exposed to its realm via ComponentDecl.exposes (specified via "expose" declarations in the component's manifest). The child component will not start as a result of this call. Instead, starting will occur iff the parent binds to one of the capabilities contained within exposed_dir.
exposed_dir is open as long as child exists.
Errors:
INVALID_ARGUMENTS:childis not a valid child reference.INSTANCE_NOT_FOUND:childdoes not exist.INSTANCE_CANNOT_RESOLVE:child's component declaration failed to resolve.INSTANCE_DIED: This realm no longer exists.
Request
| Name | Type |
|---|---|
child | fuchsia.component.decl/ChildRef |
exposed_dir | server_end:fuchsia.io/Directory |
Response
| Name | Type |
|---|---|
payload | Realm_OpenExposedDir_Result |
STRUCTS
Controller_Destroy_Response
Defined in fuchsia.component/controller.fidl
<EMPTY>
Controller_GetExposedDictionary_Response resource
Defined in fuchsia.component/controller.fidl
| Field | Type | Description | Default |
|---|---|---|---|
dictionary | fuchsia.component.sandbox/DictionaryRef | No default |
Controller_IsStarted_Response resource
Defined in fuchsia.component/controller.fidl
| Field | Type | Description | Default |
|---|---|---|---|
is_started | bool | No default |
Controller_Start_Response
Defined in fuchsia.component/controller.fidl
<EMPTY>
Introspector_GetMoniker_Response
Defined in fuchsia.component/introspector.fidl
| Field | Type | Description | Default |
|---|---|---|---|
moniker | string:4096 | No default |
NamespaceInputEntry resource
Defined in fuchsia.component/namespace.fidl
| Field | Type | Description | Default |
|---|---|---|---|
path | string:4095 | No default | |
dictionary | client_end:fuchsia.component.sandbox/Dictionary | No default |
Namespace_Create_Response resource
Defined in fuchsia.component/namespace.fidl
| Field | Type | Description | Default |
|---|---|---|---|
entries | vector<NamespaceEntry> | No default |
Realm_CreateChild_Response
Defined in fuchsia.component/realm.fidl
<EMPTY>
Realm_DestroyChild_Response
Defined in fuchsia.component/realm.fidl
<EMPTY>
Realm_GetChildOutputDictionary_Response resource
Defined in fuchsia.component/realm.fidl
| Field | Type | Description | Default |
|---|---|---|---|
dictionary | fuchsia.component.sandbox/DictionaryRef | No default |
Realm_GetResolvedInfo_Response resource
Defined in fuchsia.component/realm.fidl
| Field | Type | Description | Default |
|---|---|---|---|
resolved_info | fuchsia.component.resolution/Component | No default |
Realm_ListChildren_Response
Defined in fuchsia.component/realm.fidl
<EMPTY>
Realm_OpenController_Response
Defined in fuchsia.component/realm.fidl
<EMPTY>
Realm_OpenExposedDir_Response
Defined in fuchsia.component/realm.fidl
<EMPTY>
ENUMS
Error flexible
Type: uint32
Defined in fuchsia.component/error.fidl
Standard error codes for component framework protocols.
| Name | Value | Description |
|---|---|---|
INTERNAL | 1 | Component manager encountered an otherwise unspecified error while performing the operation. |
INVALID_ARGUMENTS | 2 | At least one argument had an invalid format. |
UNSUPPORTED | 3 | The feature is not yet supported. |
ACCESS_DENIED | 4 | The caller did not have permission to perform the specified operation, or one of the handles provided to the call had insufficient rights. |
INSTANCE_NOT_FOUND | 5 | The component instance was not found. |
INSTANCE_ALREADY_EXISTS | 6 | The component instance already exists. |
INSTANCE_CANNOT_START | 7 | The component instance could not be started. |
INSTANCE_CANNOT_RESOLVE | 8 | Failed to resolve the component's declaration. |
COLLECTION_NOT_FOUND | 9 | The component collection was not found. |
RESOURCE_UNAVAILABLE | 10 | There were insufficient resources to perform the operation. |
INSTANCE_DIED | 11 | The component instance died unexpectedly. |
RESOURCE_NOT_FOUND | 12 | The requested resource does not exist. |
INSTANCE_CANNOT_UNRESOLVE | 13 | Failed to unresolve the component. |
INSTANCE_ALREADY_STARTED | 14 | The component instance has already been started. Added: 14 |
EventType strict
Type: uint32
Defined in fuchsia.component/events.fidl
These EventTypes are used for the EventStream protocol. They are FIDL versions of the EventType enum in hooks.rs and have the same meaning.
| Name | Value | Description |
|---|---|---|
CAPABILITY_REQUESTED | 1 | A capability provided by this component has been requested. The event payload carries the request channel. |
DIRECTORY_READY | 2 | A directory exposed to the framework by a component is available. Removed: 20 |
DISCOVERED | 3 | A component instance was discovered. This is the first stage in the lifecycle of components. Dised for dynamic children when they're created, for static children when their parent is resolved, and for the root when the component manager starts. |
DESTROYED | 4 | The instance is destroyed and no longer exists. |
RESOLVED | 5 | An instance's declaration was resolved successfully for the first time. |
STARTED | 6 | This instance has started, according to component manager. However, if this is an executable component, the runner has further work to do to launch the component. |
STOPPED | 7 | An instance was stopped successfully. |
DEBUG_STARTED | 8 | Similar to STARTED, except the payload will carry an eventpair that the subscriber could use to defer the launch of the component. This allows, e.g., a debugger to perform some setup before any processes are created. |
UNRESOLVED | 9 | An instance was unresolved successfully. |
NamespaceError flexible
Type: uint32
Defined in fuchsia.component/namespace.fidl
Error returned from methods in Namespace.
| Name | Value | Description |
|---|---|---|
SHADOW | 1 | The parent of a parent shares a prefix with another namespace entry |
DUPLICATE | 2 | Two entries have the same namespace path. |
CONVERSION | 3 | Failed to convert a namespace dictionary to a directory. |
BAD_ENTRY | 4 | A namespace entry was invalid. |
DICTIONARY_READ | 5 | There was an error reading from one of the dictionaries. |
TABLES
CapabilityRequestedPayload resource
Defined in fuchsia.component/events.fidl
Payload for CapabilityRequested events
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 | name | name | The name of the capability. |
2 | capability | handle<channel> | A handle to the server end of the channel to host capability. |
CreateChildArgs resource
Defined in fuchsia.component/realm.fidl
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 | numbered_handles | vector<fuchsia.process/HandleInfo>:128 | The numbered handles to pass to the component instance. If the runner for the component does not support the numbered handles it is expected to close the handles. |
2 | dynamic_offers | vector<fuchsia.component.decl/Offer>:128 | Dynamic offers that will target the component instance. Including Any kind of offer (e.g., protocol, directory) can be used as a dynamic offer. Any source that would be valid for a static offer is also valid for a dynamic offer. Additionally, unlike static offers, dynamic offers can use a "sibling" dynamic child component as a source by setting the source to a Dynamic offers always target the newly created child component. As a result, If either the source (that is, the component named in the In order to set this field to a non-empty value, the collection in which the child component is being created must specify |
3 | controller | server_end:Controller | The controller for this component, which may be used to influence the component's lifecycle. Added: 14 |
4 | dictionary | fuchsia.component.sandbox/DictionaryRef | A dictionary that contains extra capabilities for the component instance. Added: HEAD |
DebugStartedPayload resource
Defined in fuchsia.component/events.fidl
Payload for DebugStarted events.
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 | runtime_dir | client_end:fuchsia.io/Directory | The directory served by the runner to present runtime and runner-specific information about the component. The other side is sent to the runner in ComponentStartInfo. For example, it can be queried to know whether the component is an ELF component and supports the break_on_start protocol below. |
2 | break_on_start | handle<eventpair> | An eventpair that can be used by debuggers to defer the launch of the component, e.g., ELF debuggers can setup the exception channel on the job while holding the eventpair, then drop the eventpair to notify the runner that processes could be created. The other side is sent to the runner in ComponentStartInfo. |
DestroyedPayload
Defined in fuchsia.component/events.fidl
Payload for Destroyed events.
| Ordinal | Field | Type | Description |
|---|
DirectoryReadyPayload resource
Defined in fuchsia.component/events.fidl
Payload for DirectoryReady events
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 | name | name | The name of the capability. |
2 | node | client_end:fuchsia.io/Node | Channel to the directory capability. |
DiscoveredPayload
Defined in fuchsia.component/events.fidl
Payload for Discovered events.
| Ordinal | Field | Type | Description |
|---|
Event resource
Defined in fuchsia.component/events.fidl
Contains all information about a single event
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 | header | EventHeader | Information about the component for which this event was generated. |
2 | payload | EventPayload | Optional payload for some event types |
EventHeader
Defined in fuchsia.component/events.fidl
A head providing metadata about a target component instance.
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 | event_type | EventType | Event type corresponding to the event |
2 | moniker | string:4096 | Relative moniker identifying the component instance. Relative to the scope of the event. |
3 | component_url | fuchsia.url/Url | URL used to resolve the component. |
4 | timestamp | zx/InstantBoot | Boot time when the event occurred. Added: 25 |
NamespaceEntry resource
Defined in fuchsia.component/controller.fidl
A single component namespace entry, which describes a namespace mount point (path) and the directory backing it (directory). This type is usually composed inside a vector. See ComponentStartInfo.ns for more details.
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 | path | string:4095 | The mount point for the directory, including a leading slash. For example: "/pkg", "/svc", or "/config/data". |
2 | directory | client_end:fuchsia.io/Directory | The directory mounted at the above |
PurgedPayload
Defined in fuchsia.component/events.fidl
Payload for Purged events.
| Ordinal | Field | Type | Description |
|---|
ResolvedPayload
Defined in fuchsia.component/events.fidl
Payload for Resolved events.
| Ordinal | Field | Type | Description |
|---|
StartChildArgs resource
Defined in fuchsia.component/controller.fidl
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 | numbered_handles | vector<fuchsia.process/HandleInfo>:128 | The numbered handles to pass to the component instance. If the runner for the component does not support the numbered handles it is expected to close the handles. If set, the values given here will override the handles given in CreateChildArgs. |
2 | namespace_entries | vector<NamespaceEntry>:32 | The namespace generated by component manager will be extended to include any namespace entries listed here before being given to the component's runner. If there are any conflicting entries, an error will occur when starting the component. |
3 | dictionary | fuchsia.component.sandbox/DictionaryRef | A dictionary that contains extra capabilities for the component instance. Added: HEAD |
StartedPayload
Defined in fuchsia.component/events.fidl
Payload for Started events.
| Ordinal | Field | Type | Description |
|---|
StoppedPayload
Defined in fuchsia.component/events.fidl
Payload for Stopped events.
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 | status | zx/Status | The epitaph set on the fuchsia.component.runner/ComponentController protocol channel. This is the exit status of the component. The possible status values and their meaning are described in the definition of the ComponentController protocol. |
2 | exit_code | int64 | The exit code of the component instance. Note that not all components will stop with an exit code. Many program runtimes have the concept of an exit code. Runners may map that value to this field when applicable. For example, the ELF runner will publish the Zircon process return code here. Added: 23 |
UnresolvedPayload
Defined in fuchsia.component/events.fidl
Payload for Unresolved events.
| Ordinal | Field | Type | Description |
|---|
UNIONS
Controller_Destroy_Result strict
Defined in fuchsia.component/controller.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Controller_Destroy_Response | |
2 | err | Error | |
3 | framework_err | internal |
Controller_GetExposedDictionary_Result strict resource
Defined in fuchsia.component/controller.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Controller_GetExposedDictionary_Response | |
2 | err | Error | |
3 | framework_err | internal |
Controller_IsStarted_Result strict resource
Defined in fuchsia.component/controller.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Controller_IsStarted_Response | |
2 | err | Error | |
3 | framework_err | internal |
Controller_Start_Result strict
Defined in fuchsia.component/controller.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Controller_Start_Response | |
2 | err | Error | |
3 | framework_err | internal |
EventPayload flexible resource
Defined in fuchsia.component/events.fidl
Encapsulates additional data/protocols for some event types.
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | capability_requested | CapabilityRequestedPayload | Payload for CapabilityRequested events |
2 | purged | PurgedPayload | Payload for Purged events. |
3 | directory_ready | DirectoryReadyPayload | Payload for DirectoryReady events Removed: 20 Deprecated: 19 |
4 | discovered | DiscoveredPayload | Payload for Discovered events. Deprecated: 22 |
5 | destroyed | DestroyedPayload | Payload for Destroyed events. |
6 | resolved | ResolvedPayload | Payload for Resolved events |
7 | started | StartedPayload | Payload for Started events |
8 | stopped | StoppedPayload | Payload for Stopped events |
9 | debug_started | DebugStartedPayload | Payload for DebugStarted events |
10 | unresolved | UnresolvedPayload | Payload for Unresolved events |
Introspector_GetMoniker_Result strict
Defined in fuchsia.component/introspector.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Introspector_GetMoniker_Response | |
2 | err | Error | |
3 | framework_err | internal |
Namespace_Create_Result strict resource
Defined in fuchsia.component/namespace.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Namespace_Create_Response | |
2 | err | NamespaceError | |
3 | framework_err | internal |
Realm_CreateChild_Result strict
Defined in fuchsia.component/realm.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Realm_CreateChild_Response | |
2 | err | Error |
Realm_DestroyChild_Result strict
Defined in fuchsia.component/realm.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Realm_DestroyChild_Response | |
2 | err | Error |
Realm_GetChildOutputDictionary_Result strict resource
Defined in fuchsia.component/realm.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Realm_GetChildOutputDictionary_Response | |
2 | err | Error |
Realm_GetResolvedInfo_Result strict resource
Defined in fuchsia.component/realm.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Realm_GetResolvedInfo_Response | |
2 | err | Error |
Realm_ListChildren_Result strict
Defined in fuchsia.component/realm.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Realm_ListChildren_Response | |
2 | err | Error |
Realm_OpenController_Result strict
Defined in fuchsia.component/realm.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Realm_OpenController_Response | |
2 | err | Error |
Realm_OpenExposedDir_Result strict
Defined in fuchsia.component/realm.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 | response | Realm_OpenExposedDir_Response | |
2 | err | Error |
CONSTANTS
| Name | Value | Type | Description |
|---|---|---|---|
| MAX_CAPABILITY_ID_LENGTH | 50 | uint64 | The maximum string length of a capability ID. This value is currently set arbitrarily. Added: 11 |
| MAX_CHILD_COUNT | 128 | uint32 | The maximum number of children that the a call |
| MAX_CHILD_NAME_LENGTH | 1024 | uint32 | |
| MAX_DYNAMIC_OFFER_COUNT | 128 | uint32 | The maximum number of dynamic offers that can target a created component. |
| MAX_ERROR_DESCRIPTION_LENGTH | 100 | uint64 | The maximum string length of an error description. Added: 11 |
| MAX_HANDLE_COUNT | 128 | uint32 | The maximum number of handles that can be passed to a created component. |
| MAX_MONIKER_LENGTH | 4096 | uint32 | |
| MAX_NAMESPACE_COUNT | 32 | uint32 | Added: 14 |
| MAX_NAME_LENGTH | fuchsia.io/MAX_NAME_LENGTH | uint64 | Added: 19 |
| MAX_NUM_EVENTS_RECEIVED | 100 | uint64 | The maximum number of events that a receiver can listen to. |
| MAX_PATH_LENGTH | fuchsia.io/MAX_PATH_LENGTH | uint64 | Added: 15 |
| MAX_SUBSCRIPTION_REQUESTS | 2 | uint32 | The maximum number of requests per event subscription. |
| MAX_URL_SCHEME_LENGTH | MAX_NAME_LENGTH | uint64 | Added: 19 |
ALIASES
| Name | Value | Description |
|---|---|---|
| child_name | string[MAX_CHILD_NAME_LENGTH] | |
| name | string[MAX_NAME_LENGTH] | |
| url_scheme | string[MAX_URL_SCHEME_LENGTH] |