svchost.txt

\section{svchost}

\begin{verbatim}

appmgr_svc是通向appmgr的通信通道。

outgoing.ServeFromStartupInfo()
  Serve(zx::channel(dir_request));
    vfs_.ServeDirectory(root_dir_, fbl::move(dir_request));
      OpenVnode(flags, &vn)
        (*vnode)->Open(flags, &redirect);
          PseudoDir::Open()不做事
      vn->Serve(this, fbl::move(channel), ZX_FS_RIGHT_ADMIN)
        vfs->ServeConnection(fbl::make_unique<Connection>(
                    vfs, fbl::WrapRefPtr(this), fbl::move(channel), flags));
          connection->Serve();
            wait_.set_object(channel_.get());
            wait_.Begin(vfs_->async());
              async_begin_wait(async, &wait_);
                async->ops->v1.begin_wait(async, wait);
                  zx_object_wait_async(wait->object, loop->port, (uintptr_t)wait, wait->trigger, ZX_WAIT_ASYNC_ONCE);
  让root dir监听进来的请求

  provider_load(&service_providers[i], async, outgoing.public_dir());
    provider_init(instance);
      init == nullptr
    provider_publish(instance, async, dir)
      dir->AddEntry(
            service_name,
            fbl::MakeRefCounted<fs::Service>([instance, async, service_name](zx::channel request) {
                return instance->provider->ops->connect(instance->ctx, async, service_name, request.release());
            }));
当有连接请求进来时：
new launcher::LauncherImpl(zx::channel(request));
  channel_(fbl::move(channel)),
  wait_(this, channel_.get(), ZX_CHANNEL_READABLE | ZX_CHANNEL_PEER_CLOSED) 
launcher->Begin(async);
  wait_.Begin(async);
\end{verbatim}