Processes launched by userboot will be provided with a handle of
PA_NS_DIR type and name ‘/svc’. This allows services to pipeline requests to services that might eventually be available. For now, this is only used for pipelining requests to
fuchsia.debugdata.Publisher. The server side of the handle is stashed in the
Svc Stash corresponds to the
fuchsia.boot.SvcStash protocol. Essentially the server end of the handle is propagated to booted program through the handle table as
PA_USER0 with argument
Userboot will issue one
fuchsia.boot.SvcStash/Push for each launch program, including the booted program itself. For example, if userboot would launch a test and then the booting program, it would issue a push for the test and the booting program. Each with their respective handles.