// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "fuchsia.h"

#include <magma.h>
#include <magma_util/dlog.h>
#include <magma_util/macros.h>
#include <pthread.h>
#include <zircon/syscalls.h>

static fuchsia_open_callback_t g_open_callback;
static pthread_once_t g_initialize_flag = PTHREAD_ONCE_INIT;

static void initialize()
{
   uint32_t client_handle;
   if (!fuchsia_open("/svc/fuchsia.tracing.provider.Registry", &client_handle)) {
      DLOG("Connecting to trace provider failed");
      return;
   }
   magma_status_t status = magma_initialize_tracing(client_handle);
   if (status != MAGMA_STATUS_OK) {
      DLOG("Initializing tracing failed: %d", status);
   }
}

void fuchsia_init(fuchsia_open_callback_t open_callback)
{
   g_open_callback = open_callback;

   // Multiple loader instances may call this multiple times.
   pthread_once(&g_initialize_flag, &initialize);
}

bool fuchsia_open(const char* name, zx_handle_t* channel_out)
{
   if (!g_open_callback)
      return DRETF(false, "No open callback");

   zx_handle_t client_handle, service_handle;
   zx_status_t status = zx_channel_create(0, &client_handle, &service_handle);
   if (status != ZX_OK)
      return DRETF(false, "Channel create failed: %d", status);

   int result = g_open_callback(name, service_handle);
   if (result != 0)
      return DRETF(false, "g_open_callback failed: %d", result);

   *channel_out = client_handle;
   return true;
}