test-send-recv.c 42.2 KB
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/*
 * This file is part of the Nice GLib ICE library.
 *
 * (C) 2014 Collabora Ltd.
 *  Contact: Philip Withnall
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Nice GLib ICE library.
 *
 * The Initial Developers of the Original Code are Collabora Ltd and Nokia
 * Corporation. All Rights Reserved.
 *
 * Contributors:
 *   Philip Withnall, Collabora Ltd.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * the GNU Lesser General Public License Version 2.1 (the "LGPL"), in which
 * case the provisions of LGPL are applicable instead of those above. If you
 * wish to allow use of your version of this file only under the terms of the
 * LGPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replace
 * them with the notice and other provisions required by the LGPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the LGPL.
 */

/**
 * This is a comprehensive unit test for send() and recv() behaviour in libnice,
 * covering all APIs except the old nice_agent_attach_recv() one. It aims to
 * test the correctness of reliable and non-reliable I/O through libnice, using
 * a variety of data and a variety of buffer sizes.
 *
 * Abnormal features like error handling, zero-length buffer handling, stream
 * closure and cancellation are not tested.
 *
 * This is *not* a performance test, and would require significant work to be
 * useful as one. It allocates all of its buffers dynamically, and walks over
 * them frequently to set and check data.
 *
 * Several of the strategies in the test make use of random numbers. The seed
 * values for these are deterministically set (in main()), but may be specified
 * on the command line to allow fuzzing.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "agent.h"
#include "test-io-stream-common.h"

#include <stdlib.h>
#include <string.h>
#ifndef G_OS_WIN32
#include <unistd.h>
#endif

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/* Maximum IP payload ((1 << 16) - 1), minus IP header, minus UDP header. */
#define MAX_MESSAGE_SIZE (65535 - 20 - 8) /* bytes */

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typedef enum {
  STREAM_AGENT,  /* nice_agent_[send|recv]() */
  STREAM_AGENT_NONBLOCKING,  /* nice_agent_[send|recv]_nonblocking() */
  STREAM_GIO,  /* Nice[Input|Output]Stream */
  STREAM_GSOURCE,  /* GPollable[Input|Output]Stream */
} StreamApi;
#define STREAM_API_N_ELEMENTS (STREAM_GSOURCE + 1)

typedef enum {
  BUFFER_SIZE_CONSTANT_LARGE,  /* always 65535 bytes */
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  BUFFER_SIZE_CONSTANT_SMALL,  /* always 4096 bytes */
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  BUFFER_SIZE_CONSTANT_TINY,  /* always 1 byte */
  BUFFER_SIZE_ASCENDING,  /* ascending powers of 2 */
  BUFFER_SIZE_RANDOM,  /* random every time */
} BufferSizeStrategy;
#define BUFFER_SIZE_STRATEGY_N_ELEMENTS (BUFFER_SIZE_RANDOM + 1)

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typedef enum {
  BUFFER_COUNT_CONSTANT_ONE,  /* always a single buffer */
  BUFFER_COUNT_CONSTANT_TWO,  /* always two buffers */
  BUFFER_COUNT_RANDOM,  /* random every time */
} BufferCountStrategy;
#define BUFFER_COUNT_STRATEGY_N_ELEMENTS (BUFFER_COUNT_RANDOM + 1)

typedef enum {
  MESSAGE_COUNT_CONSTANT_ONE,  /* always a single message */
  MESSAGE_COUNT_CONSTANT_TWO,  /* always two messages */
  MESSAGE_COUNT_RANDOM,  /* random every time */
} MessageCountStrategy;
#define MESSAGE_COUNT_STRATEGY_N_ELEMENTS (MESSAGE_COUNT_RANDOM + 1)

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typedef enum {
  BUFFER_DATA_CONSTANT,  /* fill with 0xfe */
  BUFFER_DATA_ASCENDING,  /* ascending values for each byte */
  BUFFER_DATA_PSEUDO_RANDOM,  /* every byte is pseudo-random */
} BufferDataStrategy;
#define BUFFER_DATA_STRATEGY_N_ELEMENTS (BUFFER_DATA_PSEUDO_RANDOM + 1)

typedef struct {
  /* Test configuration (immutable per test run). */
  gboolean reliable;
  StreamApi stream_api;
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  struct {
    BufferSizeStrategy buffer_size_strategy;
    BufferCountStrategy buffer_count_strategy;
    MessageCountStrategy message_count_strategy;
  } transmit;
  struct {
    BufferSizeStrategy buffer_size_strategy;
    BufferCountStrategy buffer_count_strategy;
    MessageCountStrategy message_count_strategy;
  } receive;
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  BufferDataStrategy buffer_data_strategy;
  gsize n_bytes;
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  guint n_messages;
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  /* Test state. */
  GRand *transmit_size_rand;
  GRand *receive_size_rand;
  gsize transmitted_bytes;
  gsize received_bytes;
  gsize *other_received_bytes;
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  guint transmitted_messages;
  guint received_messages;
  guint *other_received_messages;
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} TestData;

/* Whether @stream_api is blocking (vs. non-blocking). */
static gboolean
stream_api_is_blocking (StreamApi stream_api)
{
  switch (stream_api) {
  case STREAM_AGENT:
  case STREAM_GIO:
    return TRUE;
  case STREAM_AGENT_NONBLOCKING:
  case STREAM_GSOURCE:
    return FALSE;
  default:
    g_assert_not_reached ();
  }
}

/* Whether @stream_api only works for reliable NiceAgents. */
static gboolean
stream_api_is_reliable_only (StreamApi stream_api)
{
  switch (stream_api) {
  case STREAM_GSOURCE:
  case STREAM_GIO:
    return TRUE;
  case STREAM_AGENT:
  case STREAM_AGENT_NONBLOCKING:
    return FALSE;
  default:
    g_assert_not_reached ();
  }
}

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/* Whether @stream_api supports vectored I/O (multiple buffers or messages). */
static gboolean
stream_api_supports_vectored_io (StreamApi stream_api)
{
  switch (stream_api) {
  case STREAM_AGENT:
  case STREAM_AGENT_NONBLOCKING:
    return TRUE;
  case STREAM_GSOURCE:
  case STREAM_GIO:
    return FALSE;
  default:
    g_assert_not_reached ();
  }
}

/* Generate a size for the buffer containing the @buffer_offset-th byte.
 * Guaranteed to be in the interval [1, 1 << 16). ((1 << 16) is the maximum
 * message size.) */
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static gsize
generate_buffer_size (BufferSizeStrategy strategy, GRand *rand,
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    gsize buffer_offset)
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{
  switch (strategy) {
  case BUFFER_SIZE_CONSTANT_LARGE:
    return (1 << 16) - 1;

  case BUFFER_SIZE_CONSTANT_SMALL:
    return 4096;

  case BUFFER_SIZE_CONSTANT_TINY:
    return 1;

  case BUFFER_SIZE_ASCENDING:
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    return CLAMP (1L << buffer_offset, 1, (1 << 16) - 1);
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  case BUFFER_SIZE_RANDOM:
    return g_rand_int_range (rand, 1, 1 << 16);

  default:
    g_assert_not_reached ();
  }
}

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/* Generate a number of buffers to allocate when receiving the @buffer_offset-th
 * byte. Guaranteed to be in the interval [1, 100], where 100 was chosen
 * arbitrarily.*/
static guint
generate_buffer_count (BufferCountStrategy strategy, GRand *rand,
    gsize buffer_offset)
{
  switch (strategy) {
  case BUFFER_COUNT_CONSTANT_ONE:
    return 1;

  case BUFFER_COUNT_CONSTANT_TWO:
    return 2;

  case BUFFER_COUNT_RANDOM:
    return g_rand_int_range (rand, 1, 100 + 1);

  default:
    g_assert_not_reached ();
  }
}

/* Generate a number of messages to allocate and receive into when receiving the
 * @buffer_offset-th byte. Guaranteed to be in the interval [1, 100], where 100
 * was chosen arbitrarily.*/
static guint
generate_message_count (MessageCountStrategy strategy, GRand *rand,
    guint buffer_index)
{
  switch (strategy) {
  case MESSAGE_COUNT_CONSTANT_ONE:
    return 1;

  case MESSAGE_COUNT_CONSTANT_TWO:
    return 2;

  case MESSAGE_COUNT_RANDOM:
    return g_rand_int_range (rand, 1, 100 + 1);

  default:
    g_assert_not_reached ();
  }
}

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/* Fill the given @buf with @buf_len bytes of generated data. The data is
 * deterministically generated, so that:
 *     generate_buffer_data(_, I, buf, 2)
 * and
 *     generate_buffer_data(_, I+1, buf+1, 1)
 * generate the same buf[I+1] byte, for all I.
 *
 * The generation strategies are generally chosen to produce data which makes
 * send/receive errors (insertions, swaps, elisions) obvious. */
static void
generate_buffer_data (BufferDataStrategy strategy, gsize buffer_offset,
    guint8 *buf, gsize buf_len)
{
  switch (strategy) {
  case BUFFER_DATA_CONSTANT:
    memset (buf, 0xfe, buf_len);
    break;

  case BUFFER_DATA_ASCENDING: {
    gsize i;

    for (i = 0; i < buf_len; i++) {
      buf[i] = (i + buffer_offset) & 0xff;
    }

    break;
  }

  case BUFFER_DATA_PSEUDO_RANDOM: {
    gsize i;

    /* This can’t use GRand, because then the number of calls to g_rand_*()
     * methods would affect its output, and the bytes generated here have to be
     * entirely deterministic on @buffer_offset.
     *
     * Instead, use something akin to a LCG, except without any feedback
     * (because that would make it non-deterministic). The objective is to
     * generate numbers which are sufficiently pseudo-random that it’s likely
     * transpositions, elisions and insertions will be detected.
     *
     * The constants come from ‘ANSI C’ in:
     * http://en.wikipedia.org/wiki/Linear_congruential_generator
     */
    for (i = 0; i < buf_len; i++) {
      buf[i] = (1103515245 * (buffer_offset + i) + 12345) & 0xff;
    }

    break;
  }

  default:
    g_assert_not_reached ();
  }
}

/* Choose a size and allocate a receive buffer in @buf, ready to receive bytes
 * starting at @buffer_offset into the stream. Fill the buffer with poison
 * values to hopefully make incorrect writes/reads more obvious.
 *
 * @buf must be freed with g_free(). */
static void
generate_buffer_to_receive (TestIOStreamThreadData *data, gsize buffer_offset,
    guint8 **buf, gsize *buf_len)
{
  TestData *test_data = data->user_data;

  /* Allocate the buffer. */
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  *buf_len = generate_buffer_size (test_data->receive.buffer_size_strategy,
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      test_data->receive_size_rand, buffer_offset);
  *buf = g_malloc (*buf_len);

  /* Fill it with poison to try and detect incorrect writes. */
  memset (*buf, 0xaa, *buf_len);
}

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/* Similar to generate_buffer_to_receive(), but generate an entire message array
 * with multiple buffers instead.
 *
 * @max_buffer_size may be used to limit the total size of all the buffers in
 * all the messages, for example to avoid blocking on receiving data which will
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 * never be sent. This only applies for blocking, reliable stream APIs.
 *
 * @max_n_messages may be used to limit the number of messages generated, to
 * avoid blocking on receiving messages which will never be sent. This only
 * applies for blocking, non-reliable stream APIs.
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 *
 * @messages must be freed with g_free(), as must all of the buffer arrays and
 * the buffers themselves. */
static void
generate_messages_to_receive (TestIOStreamThreadData *data, gsize buffer_offset,
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    NiceInputMessage **messages, guint *n_messages, gsize max_buffer_size,
    guint max_n_messages)
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{
  TestData *test_data = data->user_data;
  guint i;

  /* Allocate the messages. */
  *n_messages =
      generate_message_count (test_data->receive.message_count_strategy,
          test_data->receive_size_rand, buffer_offset);
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  if (!data->reliable)
    *n_messages = MIN (*n_messages, max_n_messages);

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  *messages = g_malloc_n (*n_messages, sizeof (NiceInputMessage));

  for (i = 0; i < *n_messages; i++) {
    NiceInputMessage *message = &((*messages)[i]);
    guint j;

    message->n_buffers =
        generate_buffer_count (test_data->receive.buffer_count_strategy,
            test_data->receive_size_rand, buffer_offset);
    message->buffers = g_malloc_n (message->n_buffers, sizeof (GInputVector));
    message->from = NULL;
    message->length = 0;

    for (j = 0; j < (guint) message->n_buffers; j++) {
      GInputVector *buffer = &message->buffers[j];
      gsize buf_len;

      buf_len =
          generate_buffer_size (test_data->receive.buffer_size_strategy,
              test_data->receive_size_rand, buffer_offset);

      /* Trim the buffer length if it would otherwise cause the API to block. */
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      if (data->reliable) {
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        buf_len = MIN (buf_len, max_buffer_size);
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        max_buffer_size -= buf_len;
      }
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      buffer->size = buf_len;
      buffer->buffer = g_malloc (buffer->size);

      /* Fill it with poison to try and detect incorrect writes. */
      memset (buffer->buffer, 0xaa, buffer->size);

      /* If we’ve hit the max_buffer_size, adjust the buffer and message counts
       * and run away. */
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      if (data->reliable && max_buffer_size == 0) {
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        message->n_buffers = j + 1;
        *n_messages = i + 1;
        return;
      }
    }
  }
}

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/* Validate the length and data of a received buffer of length @buf_len, filled
 * with @len valid bytes. Updates the internal state machine to mark the bytes
 * as received. This consumes @buf. */
static void
validate_received_buffer (TestIOStreamThreadData *data, gsize buffer_offset,
    guint8 **buf, gsize buf_len, gssize len)
{
  TestData *test_data = data->user_data;
  guint8 *expected_buf;

  g_assert_cmpint (len, <=, buf_len);
  g_assert_cmpint (len, >=, 0);

  if (stream_api_is_blocking (test_data->stream_api) && data->reliable)
    g_assert_cmpint (len, ==, buf_len);

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  /* Validate the buffer contents.
   *
   * Note: Buffers can only be validated up to valid_len. The buffer may
   * have been re-used internally (e.g. by receiving a STUN message, then
   * overwriting it with a data packet), so we can’t guarantee that the
   * bytes beyond valid_len have been untouched. */
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  expected_buf = g_malloc (buf_len);
  memset (expected_buf, 0xaa, buf_len);
  generate_buffer_data (test_data->buffer_data_strategy, buffer_offset,
      expected_buf, len);
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  g_assert (memcmp (*buf, expected_buf, len) == 0);
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  g_free (expected_buf);

  test_data->received_bytes += len;

  g_free (*buf);
}

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/* Similar to validate_received_buffer(), except it validates a message array
 * instead of a single buffer. This consumes @messages. */
static void
validate_received_messages (TestIOStreamThreadData *data, gsize buffer_offset,
    NiceInputMessage **messages, guint n_messages, gint n_valid_messages)
{
  TestData *test_data = data->user_data;
  guint i;
  gsize prev_message_len = G_MAXSIZE;

  g_assert_cmpint (n_valid_messages, <=, n_messages);
  g_assert_cmpint (n_valid_messages, >=, 0);

  if (stream_api_is_blocking (test_data->stream_api))
    g_assert_cmpint (n_valid_messages, ==, n_messages);

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  test_data->received_messages += n_valid_messages;

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  /* Validate the message contents. */
  for (i = 0; i < (guint) n_valid_messages; i++) {
    NiceInputMessage *message = &((*messages)[i]);
    guint j;
    gsize total_buf_len = 0;
    gsize message_len_remaining = message->length;

    g_assert_cmpint (message->n_buffers, >, 0);

    for (j = 0; j < (guint) message->n_buffers; j++) {
      GInputVector *buffer = &message->buffers[j];
      guint8 *expected_buf;
      gsize valid_len;

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      /* See note above about valid_len. */
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      total_buf_len += buffer->size;
      valid_len = MIN (message_len_remaining, buffer->size);

      expected_buf = g_malloc (buffer->size);
      memset (expected_buf, 0xaa, buffer->size);
      generate_buffer_data (test_data->buffer_data_strategy, buffer_offset,
          expected_buf, valid_len);
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      g_assert (memcmp (buffer->buffer, expected_buf, valid_len) == 0);
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      g_free (expected_buf);

      test_data->received_bytes += valid_len;
      buffer_offset += valid_len;
      message_len_remaining -= valid_len;

      g_free (buffer->buffer);
    }

    g_assert_cmpuint (message->length, <=, total_buf_len);
    g_assert_cmpuint (message->length, >=, 0);

    /* No non-empty messages can follow an empty message. */
    if (prev_message_len == 0)
      g_assert_cmpuint (message->length, ==, 0);
    prev_message_len = message->length;

    /* If the API was blocking, it should have completely filled the message. */
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    if (stream_api_is_blocking (test_data->stream_api) && data->reliable)
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      g_assert_cmpuint (message->length, ==, total_buf_len);

    g_assert (message->from == NULL);

    g_free (message->buffers);
  }

  g_free (*messages);
}

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/* Determine a size for the next transmit buffer, allocate it, and fill it with
 * data to be transmitted. */
static void
generate_buffer_to_transmit (TestIOStreamThreadData *data, gsize buffer_offset,
    guint8 **buf, gsize *buf_len)
{
  TestData *test_data = data->user_data;

  /* Allocate the buffer. */
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  *buf_len = generate_buffer_size (test_data->transmit.buffer_size_strategy,
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      test_data->transmit_size_rand, buffer_offset);
  *buf_len = MIN (*buf_len, test_data->n_bytes - test_data->transmitted_bytes);
  *buf = g_malloc (*buf_len);

  /* Fill it with data. */
  generate_buffer_data (test_data->buffer_data_strategy, buffer_offset,
      *buf, *buf_len);
}

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/* Similar to generate_buffer_to_transmit(), except that it generates an array
 * of NiceOutputMessages rather than a single buffer. */
static void
generate_messages_to_transmit (TestIOStreamThreadData *data,
    gsize buffer_offset, NiceOutputMessage **messages, guint *n_messages)
{
  TestData *test_data = data->user_data;
  guint i;
  gsize total_buf_len = 0;

  /* Determine the number of messages to send. */
  *n_messages =
      generate_message_count (test_data->transmit.message_count_strategy,
          test_data->transmit_size_rand, buffer_offset);
  *n_messages =
      MIN (*n_messages,
          test_data->n_messages - test_data->transmitted_messages);

  *messages = g_malloc_n (*n_messages, sizeof (NiceOutputMessage));

  for (i = 0; i < *n_messages; i++) {
    NiceOutputMessage *message = &((*messages)[i]);
    guint j;
    gsize max_message_size;
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    gsize message_len = 0;
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    message->n_buffers =
        generate_buffer_count (test_data->transmit.buffer_count_strategy,
            test_data->transmit_size_rand, buffer_offset);
    message->buffers = g_malloc_n (message->n_buffers, sizeof (GOutputVector));

    /* Limit the overall message size to the smaller of (n_bytes / n_messages)
     * and MAX_MESSAGE_SIZE, to ensure each message is non-empty. */
    max_message_size =
        MIN ((test_data->n_bytes / test_data->n_messages), MAX_MESSAGE_SIZE);

    for (j = 0; j < (guint) message->n_buffers; j++) {
      GOutputVector *buffer = &message->buffers[j];
      gsize buf_len;
      guint8 *buf;

      buf_len =
          generate_buffer_size (test_data->transmit.buffer_size_strategy,
              test_data->transmit_size_rand, buffer_offset);
      buf_len =
          MIN (buf_len,
              test_data->n_bytes - test_data->transmitted_bytes - total_buf_len);
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      buf_len = MIN (buf_len, max_message_size - message_len);
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      buffer->size = buf_len;
      buf = g_malloc (buffer->size);
      buffer->buffer = buf;
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      message_len += buf_len;
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      total_buf_len += buf_len;

      /* Fill it with data. */
      generate_buffer_data (test_data->buffer_data_strategy, buffer_offset,
          buf, buf_len);

      buffer_offset += buf_len;

      /* Reached the maximum UDP payload size? */
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      if (message_len >= max_message_size) {
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        message->n_buffers = j + 1;
        break;
      }
    }

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    g_assert_cmpuint (message_len, <=, max_message_size);
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  }
}

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/* Validate the number of bytes transmitted, and update the test’s internal
 * state machine. Consumes @buf. */
static void
notify_transmitted_buffer (TestIOStreamThreadData *data, gsize buffer_offset,
    guint8 **buf, gsize buf_len, gssize len)
{
  TestData *test_data = data->user_data;

  g_assert_cmpint (len, <=, buf_len);
  g_assert_cmpint (len, >=, 0);

  test_data->transmitted_bytes += len;

  g_free (*buf);
}

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static gsize
output_message_get_size (const NiceOutputMessage *message)
{
  guint i;
  gsize message_len = 0;

  /* Find the total size of the message */
  for (i = 0;
       (message->n_buffers >= 0 && i < (guint) message->n_buffers) ||
           (message->n_buffers < 0 && message->buffers[i].buffer != NULL);
       i++)
    message_len += message->buffers[i].size;

  return message_len;
}

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/* Similar to notify_transmitted_buffer(), except it operates on an array of
 * messages from generate_messages_to_transmit(). */
static void
notify_transmitted_messages (TestIOStreamThreadData *data, gsize buffer_offset,
    NiceOutputMessage **messages, guint n_messages, gint n_sent_messages)
{
  TestData *test_data = data->user_data;
  guint i;

  g_assert_cmpint (n_sent_messages, <=, n_messages);
  g_assert_cmpint (n_sent_messages, >=, 0);

  test_data->transmitted_messages += n_sent_messages;

  for (i = 0; i < n_messages; i++) {
    NiceOutputMessage *message = &((*messages)[i]);
    guint j;

    if (i < (guint) n_sent_messages)
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      test_data->transmitted_bytes += output_message_get_size (message);
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    for (j = 0; j < (guint) message->n_buffers; j++) {
      GOutputVector *buffer = &message->buffers[j];

      g_free ((guint8 *) buffer->buffer);
    }

    g_free (message->buffers);
  }

  g_free (*messages);
}

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/*
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 * Implementation using nice_agent_recv_messages() and nice_agent_send().
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 */
static void
read_thread_agent_cb (GInputStream *input_stream, TestIOStreamThreadData *data)
{
  TestData *test_data = data->user_data;
  guint stream_id, component_id;
  gpointer tmp;

  tmp = g_object_get_data (G_OBJECT (data->agent), "stream-id");
  stream_id = GPOINTER_TO_UINT (tmp);
  component_id = 1;

  while (test_data->received_bytes < test_data->n_bytes) {
    GError *error = NULL;
681 682 683
    NiceInputMessage *messages;
    guint n_messages;
    gint n_valid_messages;
684

685 686
    /* Initialise an array of messages to receive into. */
    generate_messages_to_receive (data, test_data->received_bytes, &messages,
687 688
        &n_messages, test_data->n_bytes - test_data->received_bytes,
        test_data->n_messages - test_data->received_messages);
689 690

    /* Block on receiving some data. */
691 692
    n_valid_messages = nice_agent_recv_messages (data->agent, stream_id,
        component_id, messages, n_messages, NULL, &error);
693 694
    g_assert_no_error (error);

695 696 697
    /* Check the messages and update the test’s state machine. */
    validate_received_messages (data, test_data->received_bytes, &messages,
        n_messages, n_valid_messages);
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
  }

  check_for_termination (data, &test_data->received_bytes,
      test_data->other_received_bytes, &test_data->transmitted_bytes,
      test_data->n_bytes);
}

static void
write_thread_agent_cb (GOutputStream *output_stream,
    TestIOStreamThreadData *data)
{
  TestData *test_data = data->user_data;
  guint stream_id, component_id;
  gpointer tmp;

  tmp = g_object_get_data (G_OBJECT (data->agent), "stream-id");
  stream_id = GPOINTER_TO_UINT (tmp);
  component_id = 1;

  while (test_data->transmitted_bytes < test_data->n_bytes) {
    GError *error = NULL;
719 720 721
    NiceOutputMessage *messages;
    guint n_messages;
    gint n_sent_messages;
722 723

    /* Generate a buffer to transmit. */
724 725
    generate_messages_to_transmit (data, test_data->transmitted_bytes,
        &messages, &n_messages);
726

727
    /* Busy loop on receiving some data. */
728
    do {
729 730 731 732 733 734
      g_clear_error (&error);
      n_sent_messages = nice_agent_send_messages_nonblocking (data->agent,
          stream_id, component_id, messages, n_messages, NULL, &error);
    } while (n_sent_messages == -1 &&
        g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK));
    g_assert_no_error (error);
735 736

    /* Update the test’s buffer generation state machine. */
737 738
    notify_transmitted_messages (data, test_data->transmitted_bytes, &messages,
        n_messages, n_sent_messages);
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759
  }
}

/*
 * Implementation using nice_agent_recv_nonblocking() and
 * nice_agent_send_nonblocking().
 */
static void
read_thread_agent_nonblocking_cb (GInputStream *input_stream,
    TestIOStreamThreadData *data)
{
  TestData *test_data = data->user_data;
  guint stream_id, component_id;
  gpointer tmp;

  tmp = g_object_get_data (G_OBJECT (data->agent), "stream-id");
  stream_id = GPOINTER_TO_UINT (tmp);
  component_id = 1;

  while (test_data->received_bytes < test_data->n_bytes) {
    GError *error = NULL;
760 761 762
    NiceInputMessage *messages;
    guint n_messages;
    gint n_valid_messages;
763

764 765
    /* Initialise an array of messages to receive into. */
    generate_messages_to_receive (data, test_data->received_bytes, &messages,
766 767 768 769 770 771
        &n_messages, test_data->n_bytes - test_data->received_bytes,
        test_data->n_messages - test_data->received_messages);

    /* Trim n_messages to avoid consuming the ‘done’ message. */
    n_messages =
        MIN (n_messages, test_data->n_messages - test_data->received_messages);
772 773 774 775

    /* Busy loop on receiving some data. */
    do {
      g_clear_error (&error);
776 777 778
      n_valid_messages = nice_agent_recv_messages_nonblocking (data->agent,
          stream_id, component_id, messages, n_messages, NULL, &error);
    } while (n_valid_messages == -1 &&
779 780 781
        g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK));
    g_assert_no_error (error);

782 783 784
    /* Check the messages and update the test’s state machine. */
    validate_received_messages (data, test_data->received_bytes, &messages,
        n_messages, n_valid_messages);
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
  }

  check_for_termination (data, &test_data->received_bytes,
      test_data->other_received_bytes, &test_data->transmitted_bytes,
      test_data->n_bytes);
}

static void
write_thread_agent_nonblocking_cb (GOutputStream *output_stream,
    TestIOStreamThreadData *data)
{
  /* FIXME: There is no nice_agent_send_nonblocking(); nice_agent_send() is
   * non-blocking by default. */
  write_thread_agent_cb (output_stream, data);
}

/*
 * Implementation using NiceInputStream and NiceOutputStream.
 */
static void
read_thread_gio_cb (GInputStream *input_stream, TestIOStreamThreadData *data)
{
  TestData *test_data = data->user_data;

  while (test_data->received_bytes < test_data->n_bytes) {
    GError *error = NULL;
    guint8 *buf = NULL;
    gsize buf_len = 0;
    gssize len;

    /* Initialise a receive buffer. */
    generate_buffer_to_receive (data, test_data->received_bytes, &buf,
        &buf_len);

    /* Trim the receive buffer to avoid blocking on bytes which will never
     * appear. */
    buf_len = MIN (buf_len, test_data->n_bytes - test_data->received_bytes);

    /* Block on receiving some data. */
    len = g_input_stream_read (input_stream, buf, buf_len, NULL, &error);
    g_assert_no_error (error);

    /* Check the buffer and update the test’s state machine. */
    validate_received_buffer (data, test_data->received_bytes, &buf, buf_len,
        len);
  }

  check_for_termination (data, &test_data->received_bytes,
      test_data->other_received_bytes, &test_data->transmitted_bytes,
      test_data->n_bytes);
}

static void
write_thread_gio_cb (GOutputStream *output_stream, TestIOStreamThreadData *data)
{
  TestData *test_data = data->user_data;

  while (test_data->transmitted_bytes < test_data->n_bytes) {
    GError *error = NULL;
    guint8 *buf = NULL;
    gsize buf_len = 0;
    gssize len;
    gsize total_len = 0;

    /* Generate a buffer to transmit. */
    generate_buffer_to_transmit (data, test_data->transmitted_bytes, &buf,
        &buf_len);

    /* Transmit it. */
    do {
      len = g_output_stream_write (output_stream, buf + total_len,
          buf_len - total_len, NULL, &error);
      g_assert_no_error (error);
      total_len += len;
    } while (total_len < buf_len);

    /* Update the test’s buffer generation state machine. */
    notify_transmitted_buffer (data, test_data->transmitted_bytes, &buf,
        buf_len, total_len);
  }
}

/*
 * Implementation using GPollableInputStream and GPollableOutputStream.
 *
 * GSourceData is effectively the closure for the ‘for’ loop in other stream API
 * implementations.
 */
typedef struct {
  TestIOStreamThreadData *data;
  GMainLoop *main_loop;
} GSourceData;

static gboolean
read_stream_cb (GObject *pollable_stream, gpointer _user_data)
{
  GSourceData *gsource_data = _user_data;
  TestIOStreamThreadData *data = gsource_data->data;
  TestData *test_data = data->user_data;
  GError *error = NULL;
  guint8 *buf = NULL;
  gsize buf_len = 0;
  gssize len;

  /* Initialise a receive buffer. */
  generate_buffer_to_receive (data, test_data->received_bytes, &buf, &buf_len);

  /* Trim the receive buffer to avoid consuming the ‘done’ message. */
  buf_len = MIN (buf_len, test_data->n_bytes - test_data->received_bytes);

  /* Try to receive some data. */
  len = g_pollable_input_stream_read_nonblocking (
      G_POLLABLE_INPUT_STREAM (pollable_stream), buf, buf_len, NULL, &error);

  if (len == -1) {
    g_assert_error (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK);
    g_free (buf);
    return TRUE;
  }

  g_assert_no_error (error);

  /* Check the buffer and update the test’s state machine. */
  validate_received_buffer (data, test_data->received_bytes, &buf, buf_len,
      len);

  /* Termination time? */
  if (test_data->received_bytes == test_data->n_bytes) {
    g_main_loop_quit (gsource_data->main_loop);
    return FALSE;
  }

  return TRUE;
}

static void
read_thread_gsource_cb (GInputStream *input_stream,
    TestIOStreamThreadData *data)
{
  TestData *test_data = data->user_data;
  GSourceData gsource_data;
  GMainContext *main_context;
  GMainLoop *main_loop;
  GSource *stream_source;

  main_context = g_main_context_ref_thread_default ();
  main_loop = g_main_loop_new (main_context, FALSE);

  gsource_data.data = data;
  gsource_data.main_loop = main_loop;

  stream_source =
      g_pollable_input_stream_create_source (
          G_POLLABLE_INPUT_STREAM (input_stream), NULL);

  g_source_set_callback (stream_source, (GSourceFunc) read_stream_cb,
      &gsource_data, NULL);
  g_source_attach (stream_source, main_context);

  /* Run the main loop. */
  g_main_loop_run (main_loop);

  g_source_destroy (stream_source);
  g_source_unref (stream_source);
  g_main_loop_unref (main_loop);
  g_main_context_unref (main_context);

  /* Termination? */
  check_for_termination (data, &test_data->received_bytes,
      test_data->other_received_bytes, &test_data->transmitted_bytes,
      test_data->n_bytes);
}

static gboolean
write_stream_cb (GObject *pollable_stream, gpointer _user_data)
{
  GSourceData *gsource_data = _user_data;
  TestIOStreamThreadData *data = gsource_data->data;
  TestData *test_data = data->user_data;
  GError *error = NULL;
  guint8 *buf = NULL;
  gsize buf_len = 0;
  gssize len;

  /* Initialise a receive buffer. */
  generate_buffer_to_transmit (data, test_data->transmitted_bytes, &buf,
      &buf_len);

  /* Try to transmit some data. */
  len = g_pollable_output_stream_write_nonblocking (
      G_POLLABLE_OUTPUT_STREAM (pollable_stream), buf, buf_len, NULL, &error);

  if (len == -1) {
    g_assert_error (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK);
    g_free (buf);
    return TRUE;
  }

  g_assert_no_error (error);

  /* Update the test’s buffer generation state machine. */
  notify_transmitted_buffer (data, test_data->transmitted_bytes, &buf, buf_len,
      len);

  /* Termination time? */
  if (test_data->transmitted_bytes == test_data->n_bytes) {
    g_main_loop_quit (gsource_data->main_loop);
    return FALSE;
  }

  return TRUE;
}

static void
write_thread_gsource_cb (GOutputStream *output_stream,
    TestIOStreamThreadData *data)
{
  GSourceData gsource_data;
  GMainContext *main_context;
  GMainLoop *main_loop;
  GSource *stream_source;

  main_context = g_main_context_ref_thread_default ();
  main_loop = g_main_loop_new (main_context, FALSE);

  gsource_data.data = data;
  gsource_data.main_loop = main_loop;

  stream_source =
      g_pollable_output_stream_create_source (
          G_POLLABLE_OUTPUT_STREAM (output_stream), NULL);

  g_source_set_callback (stream_source, (GSourceFunc) write_stream_cb,
      &gsource_data, NULL);
  g_source_attach (stream_source, main_context);

  /* Run the main loop. */
  g_main_loop_run (main_loop);

  g_source_destroy (stream_source);
  g_source_unref (stream_source);
  g_main_loop_unref (main_loop);
  g_main_context_unref (main_context);
}

static void
test_data_init (TestData *data, gboolean reliable, StreamApi stream_api,
1032 1033
    gsize n_bytes, guint n_messages,
    BufferSizeStrategy transmit_buffer_size_strategy,
1034 1035
    BufferCountStrategy transmit_buffer_count_strategy,
    MessageCountStrategy transmit_message_count_strategy,
1036
    BufferSizeStrategy receive_buffer_size_strategy,
1037 1038
    BufferCountStrategy receive_buffer_count_strategy,
    MessageCountStrategy receive_message_count_strategy,
1039
    BufferDataStrategy buffer_data_strategy, guint32 transmit_seed,
1040 1041
    guint32 receive_seed, gsize *other_received_bytes,
    guint *other_received_messages)
1042 1043 1044 1045
{
  data->reliable = reliable;
  data->stream_api = stream_api;
  data->n_bytes = n_bytes;
1046
  data->n_messages = n_messages;
1047 1048 1049 1050 1051 1052
  data->transmit.buffer_size_strategy = transmit_buffer_size_strategy;
  data->transmit.buffer_count_strategy = transmit_buffer_count_strategy;
  data->transmit.message_count_strategy = transmit_message_count_strategy;
  data->receive.buffer_size_strategy = receive_buffer_size_strategy;
  data->receive.buffer_count_strategy = receive_buffer_count_strategy;
  data->receive.message_count_strategy = receive_message_count_strategy;
1053 1054 1055 1056 1057 1058
  data->buffer_data_strategy = buffer_data_strategy;
  data->transmit_size_rand = g_rand_new_with_seed (transmit_seed);
  data->receive_size_rand = g_rand_new_with_seed (receive_seed);
  data->transmitted_bytes = 0;
  data->received_bytes = 0;
  data->other_received_bytes = other_received_bytes;
1059 1060 1061
  data->transmitted_messages = 0;
  data->received_messages = 0;
  data->other_received_messages = other_received_messages;
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
}

/*
 * Test closures.
 */
static void
test_data_clear (TestData *data)
{
  g_rand_free (data->receive_size_rand);
  g_rand_free (data->transmit_size_rand);
}

static void
1075
test (gboolean reliable, StreamApi stream_api, gsize n_bytes, guint n_messages,
1076
    BufferSizeStrategy transmit_buffer_size_strategy,
1077 1078
    BufferCountStrategy transmit_buffer_count_strategy,
    MessageCountStrategy transmit_message_count_strategy,
1079
    BufferSizeStrategy receive_buffer_size_strategy,
1080 1081
    BufferCountStrategy receive_buffer_count_strategy,
    MessageCountStrategy receive_message_count_strategy,
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
    BufferDataStrategy buffer_data_strategy,
    guint32 transmit_seed, guint32 receive_seed,
    guint deadlock_timeout)
{
  TestData l_data, r_data;

  /* Indexed by StreamApi. */
  const TestIOStreamCallbacks callbacks[] = {
    { read_thread_agent_cb,
      write_thread_agent_cb, NULL, NULL, },  /* STREAM_AGENT */
    { read_thread_agent_nonblocking_cb, write_thread_agent_nonblocking_cb,
      NULL, NULL, },  /* STREAM_AGENT_NONBLOCKING */
    { read_thread_gio_cb, write_thread_gio_cb, NULL, NULL, },  /* STREAM_GIO */
    { read_thread_gsource_cb, write_thread_gsource_cb,
      NULL, NULL },  /* STREAM_GSOURCE */
  };

1099
  test_data_init (&l_data, reliable, stream_api, n_bytes, n_messages,
1100 1101 1102
      transmit_buffer_size_strategy, transmit_buffer_count_strategy,
      transmit_message_count_strategy, receive_buffer_size_strategy,
      receive_buffer_count_strategy, receive_message_count_strategy,
1103
      buffer_data_strategy, transmit_seed, receive_seed,
1104 1105
      &r_data.received_bytes, &r_data.received_messages);
  test_data_init (&r_data, reliable, stream_api, n_bytes, n_messages,
1106 1107 1108
      transmit_buffer_size_strategy, transmit_buffer_count_strategy,
      transmit_message_count_strategy, receive_buffer_size_strategy,
      receive_buffer_count_strategy, receive_message_count_strategy,
1109
      buffer_data_strategy, transmit_seed, receive_seed,
1110
      &l_data.received_bytes, &l_data.received_messages);
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121

  run_io_stream_test (deadlock_timeout, reliable, &callbacks[stream_api],
      &l_data, NULL, &r_data, NULL);

  test_data_clear (&r_data);
  test_data_clear (&l_data);
}

/* Options with default values. */
guint32 option_transmit_seed = 0;
guint32 option_receive_seed = 0;
1122 1123
gsize option_n_bytes = 10000;
guint option_n_messages = 50;
1124 1125 1126 1127 1128 1129 1130 1131 1132
guint option_timeout = 1200;  /* seconds */
gboolean option_long_mode = FALSE;

static GOptionEntry entries[] = {
  { "transmit-seed", 0, 0, G_OPTION_ARG_INT, &option_transmit_seed,
    "Seed for transmission RNG", "S" },
  { "receive-seed", 0, 0, G_OPTION_ARG_INT, &option_receive_seed,
    "Seed for reception RNG", "S" },
  { "n-bytes", 'n', 0, G_OPTION_ARG_INT64, &option_n_bytes,
1133 1134 1135
    "Number of bytes to send in each test (default 10000)", "N" },
  { "n-messages", 'm', 0, G_OPTION_ARG_INT64, &option_n_messages,
    "Number of messages to send in each test (default 50)", "M" },
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148
  { "timeout", 't', 0, G_OPTION_ARG_INT, &option_timeout,
    "Deadlock detection timeout length, in seconds (default: 1200)", "S" },
  { "long-mode", 'l', 0, G_OPTION_ARG_NONE, &option_long_mode,
    "Enable all tests, rather than a fast subset", NULL },
  { NULL },
};

int
main (int argc, char *argv[])
{
  gboolean reliable;
  StreamApi stream_api;
  BufferSizeStrategy transmit_buffer_size_strategy;
1149 1150
  BufferCountStrategy transmit_buffer_count_strategy;
  MessageCountStrategy transmit_message_count_strategy;
1151
  BufferSizeStrategy receive_buffer_size_strategy;
1152 1153
  BufferCountStrategy receive_buffer_count_strategy;
  MessageCountStrategy receive_message_count_strategy;
1154 1155 1156 1157
  BufferDataStrategy buffer_data_strategy;
  guint32 transmit_seed;
  guint32 receive_seed;
  gsize n_bytes;
1158
  guint n_messages;
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
  guint deadlock_timeout;
  gboolean long_mode;
  GOptionContext *context;
  GError *error = NULL;

  /* Argument parsing. Allow some of the test parameters to be specified on the
   * command line. */
  context = g_option_context_new ("— test send()/recv() correctness");
  g_option_context_add_main_entries (context, entries, NULL);

  if (!g_option_context_parse (context, &argc, &argv, &error)) {
    g_printerr ("Option parsing failed: %s\n", error->message);
    g_error_free (error);
    exit (1);
  }

  /* Set up the defaults. */
  transmit_seed = option_transmit_seed;
  receive_seed = option_receive_seed;
  n_bytes = option_n_bytes;
1179
  n_messages = option_n_messages;
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
  deadlock_timeout = option_timeout;
  long_mode = option_long_mode;

#ifdef G_OS_WIN32
  WSADATA w;
  WSAStartup (0x0202, &w);
#endif
  g_type_init ();
  g_thread_init (NULL);

  if (!long_mode) {
    /* Quick mode. Just test each of the stream APIs in reliable and
     * non-reliable mode, with a single pair of buffer strategies, and a single
     * data strategy. */

    /* Reliability. */
    for (reliable = 0; reliable < 2; reliable++) {
      /* Stream API. */
      for (stream_api = 0;
           (guint) stream_api < STREAM_API_N_ELEMENTS;
           stream_api++) {
        /* GIO streams must always be reliable. */
        if (!reliable && stream_api_is_reliable_only (stream_api))
          continue;

        /* Non-reliable socket receives require large buffers. */
        if (reliable) {
          receive_buffer_size_strategy = BUFFER_SIZE_RANDOM;
        } else {
          receive_buffer_size_strategy = BUFFER_SIZE_CONSTANT_LARGE;
        }

        transmit_buffer_size_strategy = BUFFER_SIZE_RANDOM;
        buffer_data_strategy = BUFFER_DATA_PSEUDO_RANDOM;

1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
        if (stream_api_supports_vectored_io (stream_api)) {
          transmit_buffer_count_strategy = BUFFER_COUNT_RANDOM;
          transmit_message_count_strategy = MESSAGE_COUNT_RANDOM;
          receive_buffer_count_strategy = BUFFER_COUNT_RANDOM;
          receive_message_count_strategy = MESSAGE_COUNT_RANDOM;
        } else {
          transmit_buffer_count_strategy = BUFFER_COUNT_CONSTANT_ONE;
          transmit_message_count_strategy = MESSAGE_COUNT_CONSTANT_ONE;
          receive_buffer_count_strategy = BUFFER_COUNT_CONSTANT_ONE;
          receive_message_count_strategy = MESSAGE_COUNT_CONSTANT_ONE;
        }

1227
        g_debug ("Running test (%u, %u, %" G_GSIZE_FORMAT ", %u, %u, "
1228
            "%u, %u, %u, %u)…",
1229 1230
            reliable, stream_api, n_bytes, n_messages,
            transmit_buffer_size_strategy,
1231 1232
            receive_buffer_size_strategy, buffer_data_strategy,
            transmit_seed, receive_seed);
1233 1234
        test (reliable, stream_api, n_bytes, n_messages,
            transmit_buffer_size_strategy,
1235 1236 1237
            transmit_buffer_count_strategy, transmit_message_count_strategy,
            receive_buffer_size_strategy, receive_buffer_count_strategy,
            receive_message_count_strategy, buffer_data_strategy,
1238
            transmit_seed, receive_seed,
1239
            deadlock_timeout);
1240 1241 1242 1243 1244 1245
      }
    }

    goto done;
  }

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#define STRATEGY_LOOP(V, L) for (V = 0; (guint) V < L##_N_ELEMENTS; V++)
  STRATEGY_LOOP(transmit_buffer_size_strategy, BUFFER_SIZE_STRATEGY)
  STRATEGY_LOOP(transmit_buffer_count_strategy, BUFFER_COUNT_STRATEGY)
  STRATEGY_LOOP(transmit_message_count_strategy, MESSAGE_COUNT_STRATEGY)
  STRATEGY_LOOP(receive_buffer_size_strategy, BUFFER_SIZE_STRATEGY)
  STRATEGY_LOOP(receive_buffer_count_strategy, BUFFER_COUNT_STRATEGY)
  STRATEGY_LOOP(receive_message_count_strategy, MESSAGE_COUNT_STRATEGY)
  STRATEGY_LOOP(buffer_data_strategy, BUFFER_DATA_STRATEGY)
  /* Reliability. */
  for (reliable = 0; reliable < 2; reliable++) {
    /* Stream API. */
    for (stream_api = 0;
         (guint) stream_api < STREAM_API_N_ELEMENTS;
         stream_api++) {
      /* GIO streams must always be reliable. */
      if (!reliable && stream_api_is_reliable_only (stream_api))
        continue;

      /* Non-reliable socket receives require large buffers. We don’t claim to
       * support using them with small (< 65536B) buffers, so don’t test
       * them. */
      if (!reliable &&
          receive_buffer_size_strategy != BUFFER_SIZE_CONSTANT_LARGE)
        continue;

      /* Non-reliable socket transmits will always block with huge buffers. */
      if (!reliable &&
          transmit_buffer_size_strategy == BUFFER_SIZE_CONSTANT_LARGE)
        continue;

      /* Stream APIs which don’t support vectored I/O must not be passed
       * I/O vectors. */
      if (!stream_api_supports_vectored_io (stream_api) &&
          (transmit_buffer_count_strategy != BUFFER_COUNT_CONSTANT_ONE ||
           transmit_message_count_strategy != MESSAGE_COUNT_CONSTANT_ONE ||
           receive_buffer_count_strategy != BUFFER_COUNT_CONSTANT_ONE ||
           receive_message_count_strategy != MESSAGE_COUNT_CONSTANT_ONE))
        continue;

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      g_debug ("Running test (%u, %u, %" G_GSIZE_FORMAT ", %u, %u, "
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          "%u, %u, %u, %u, %u, %u, %u, %u)…",
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          reliable, stream_api, n_bytes, n_messages,
          transmit_buffer_size_strategy,
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          transmit_buffer_count_strategy, transmit_message_count_strategy,
          receive_buffer_size_strategy, receive_buffer_count_strategy,
          receive_message_count_strategy, buffer_data_strategy,
          transmit_seed, receive_seed);
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      test (reliable, stream_api, n_bytes, n_messages,
          transmit_buffer_size_strategy,
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          transmit_buffer_count_strategy, transmit_message_count_strategy,
          receive_buffer_size_strategy, receive_buffer_count_strategy,
          receive_message_count_strategy, buffer_data_strategy,
          transmit_seed, receive_seed,
          deadlock_timeout);
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    }
  }

done:
#ifdef G_OS_WIN32
  WSACleanup ();
#endif

  return 0;
}