Enum ProviderRequest 

pub enum ProviderRequest {
    Initialize {
        config: ProviderConfig,
        control_handle: ProviderControlHandle,
    },
    Start {
        options: StartOptions,
        control_handle: ProviderControlHandle,
    },
    Stop {
        control_handle: ProviderControlHandle,
    },
    Terminate {
        control_handle: ProviderControlHandle,
    },
    GetKnownCategories {
        responder: ProviderGetKnownCategoriesResponder,
    },
}

The provider interface which applications must implement and register with the TraceRegistry to participate in tracing.

See //zircon/system/ulib/trace-provider/ for a C++ implementation of this interface which can easily be configured by an application.

Variants

Initialize

Initialize tracing and prepare for writing trace records for events in the specified categories into buffer using fifo for signaling. Tracing hasn’t started yet, a Start() call is still required.

At most one trace can be active at a time. Subsequent Initialize() requests received prior to a Terminate() call must be ignored.

Fields

config: ProviderConfig

control_handle: ProviderControlHandle

Start

Begin tracing.

If tracing has already started the provider must ignore the request.

There is no result. The provider must send a TRACE_PROVIDER_STARTED packet on fifo to indicate success/failure of starting.

Fields

options: StartOptions

control_handle: ProviderControlHandle

Stop

Stop tracing.

If tracing has already stopped the provider must ignore the request.

Once the provider has finished writing any final events to the trace buffer, it must send a TRACE_PROVIDER_STOPPED packet on fifo. Note that multiple Start,Stop requests can be received between Initialize,Terminate.

Fields

control_handle: ProviderControlHandle

Terminate

Terminate tracing.

Tracing is stopped first if not already stopped. After tracing has fully terminated the provider must close both buffer and fifo to indicate to the trace manager that tracing is finished.

Fields

control_handle: ProviderControlHandle

GetKnownCategories

Gets the trace categories that might be produced by this provider.

Fields

responder: ProviderGetKnownCategoriesResponder

Implementations

impl ProviderRequest

pub fn into_initialize(self) -> Option<(ProviderConfig, ProviderControlHandle)>

pub fn into_start(self) -> Option<(StartOptions, ProviderControlHandle)>

pub fn into_stop(self) -> Option<ProviderControlHandle>

pub fn into_terminate(self) -> Option<ProviderControlHandle>

pub fn into_get_known_categories( self, ) -> Option<ProviderGetKnownCategoriesResponder>

pub fn method_name(&self) -> &'static str

Name of the method defined in FIDL

Trait Implementations

impl Debug for ProviderRequest

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

Formats the value using the given formatter.