/* Copyright The libuv project and contributors. All rights reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to

 * deal in the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 */

#include "uv.h"

#include "task.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define CHECK_OBJECT(handle, type, parent) \

  ASSERT((type*)(handle) == &(parent))

static uv_udp_t client;

static uv_idle_t idle_handle;

static uv_udp_send_t send_req;

static uv_buf_t buf;

static struct sockaddr_in addr;

static char send_data[1024];

static int loop_hang_called;

static void send_cb(uv_udp_send_t* req, int status);

static void idle_cb(uv_idle_t* handle) {

  int r;

  ASSERT(send_req.handle == NULL);

  CHECK_OBJECT(handle, uv_idle_t, idle_handle);

  ASSERT(0 == uv_idle_stop(handle));

  /* It probably would have stalled by now if it's going to stall at all. */

  if (++loop_hang_called > 1000) {

    uv_close((uv_handle_t*) &client, NULL);

    uv_close((uv_handle_t*) &idle_handle, NULL);

    return;

  }

  r = uv_udp_send(&send_req,

                  &client,

                  &buf,

                  1,

                  (const struct sockaddr*) &addr,

                  send_cb);

  ASSERT(r == 0);

}

static void send_cb(uv_udp_send_t* req, int status) {

  ASSERT(req != NULL);

  ASSERT(status == 0 || status == UV_ENETUNREACH);

  CHECK_OBJECT(req->handle, uv_udp_t, client);

  CHECK_OBJECT(req, uv_udp_send_t, send_req);

  req->handle = NULL;

  ASSERT(0 == uv_idle_start(&idle_handle, idle_cb));

}

TEST_IMPL(udp_send_hang_loop) {

  ASSERT(0 == uv_idle_init(uv_default_loop(), &idle_handle));

  /* 192.0.2.0/8 is "TEST-NET" and reserved for documentation.

   * Good for us, though. Since we want to have something unreachable.

   */

  ASSERT(0 == uv_ip4_addr("192.0.2.3", TEST_PORT, &addr));

  ASSERT(0 == uv_udp_init(uv_default_loop(), &client));

  buf = uv_buf_init(send_data, sizeof(send_data));

  ASSERT(0 == uv_idle_start(&idle_handle, idle_cb));

  uv_run(uv_default_loop(), UV_RUN_DEFAULT);

  ASSERT(loop_hang_called > 1000);

  MAKE_VALGRIND_HAPPY();

  return 0;

}