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1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to
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5 * deal in the Software without restriction, including without limitation the
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6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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7 * sell copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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19 * IN THE SOFTWARE.
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20 */
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21
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22 /*
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23 * TODO: Add explanation of why we want on_close to be called from fresh
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24 * stack.
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25 */
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26
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27 #include "uv.h"
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28 #include "task.h"
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29
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30
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31 static const char MESSAGE[] = "Failure is for the weak. Everyone dies alone.";
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32
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33 static uv_tcp_t client;
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34 static uv_timer_t timer;
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35 static uv_connect_t connect_req;
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36 static uv_write_t write_req;
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37 static uv_shutdown_t shutdown_req;
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38
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39 static int nested = 0;
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40 static int close_cb_called = 0;
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41 static int connect_cb_called = 0;
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42 static int write_cb_called = 0;
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43 static int timer_cb_called = 0;
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44 static int bytes_received = 0;
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45 static int shutdown_cb_called = 0;
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46
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47
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48 static void alloc_cb(uv_handle_t* handle, size_t size, uv_buf_t* buf) {
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49 buf->len = size;
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50 buf->base = malloc(size);
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51 ASSERT_NOT_NULL(buf->base);
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52 }
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53
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54
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55 static void close_cb(uv_handle_t* handle) {
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56 ASSERT(nested == 0 && "close_cb must be called from a fresh stack");
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57
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58 close_cb_called++;
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59 }
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60
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61
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62 static void shutdown_cb(uv_shutdown_t* req, int status) {
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63 ASSERT_OK(status);
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64 ASSERT(nested == 0 && "shutdown_cb must be called from a fresh stack");
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65
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66 shutdown_cb_called++;
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67 }
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68
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69
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70 static void read_cb(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* buf) {
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71 ASSERT(nested == 0 && "read_cb must be called from a fresh stack");
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72
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73 printf("Read. nread == %d\n", (int)nread);
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74 free(buf->base);
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75
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76 if (nread == 0) {
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77 return;
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78
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79 } else if (nread < 0) {
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80 ASSERT_EQ(nread, UV_EOF);
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81
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82 nested++;
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83 uv_close((uv_handle_t*)tcp, close_cb);
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84 nested--;
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85
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86 return;
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87 }
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88
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89 bytes_received += nread;
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90
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91 /* We call shutdown here because when bytes_received == sizeof MESSAGE there
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92 * will be no more data sent nor received, so here it would be possible for a
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93 * backend to call shutdown_cb immediately and *not* from a fresh stack. */
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94 if (bytes_received == sizeof MESSAGE) {
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95 nested++;
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96
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97 puts("Shutdown");
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98
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99 if (uv_shutdown(&shutdown_req, (uv_stream_t*)tcp, shutdown_cb)) {
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100 FATAL("uv_shutdown failed");
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101 }
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102 nested--;
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103 }
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104 }
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105
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106
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107 static void timer_cb(uv_timer_t* handle) {
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108 ASSERT_PTR_EQ(handle, &timer);
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109 ASSERT(nested == 0 && "timer_cb must be called from a fresh stack");
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110
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111 puts("Timeout complete. Now read data...");
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112
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113 nested++;
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114 if (uv_read_start((uv_stream_t*)&client, alloc_cb, read_cb)) {
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115 FATAL("uv_read_start failed");
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116 }
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117 nested--;
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118
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119 timer_cb_called++;
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120
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121 uv_close((uv_handle_t*)handle, close_cb);
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122 }
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123
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124
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125 static void write_cb(uv_write_t* req, int status) {
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126 int r;
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127
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128 ASSERT_OK(status);
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129 ASSERT(nested == 0 && "write_cb must be called from a fresh stack");
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130
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131 puts("Data written. 500ms timeout...");
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132
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133 /* After the data has been sent, we're going to wait for a while, then start
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134 * reading. This makes us certain that the message has been echoed back to
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135 * our receive buffer when we start reading. This maximizes the temptation
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136 * for the backend to use dirty stack for calling read_cb. */
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137 nested++;
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138 r = uv_timer_init(uv_default_loop(), &timer);
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139 ASSERT_OK(r);
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140 r = uv_timer_start(&timer, timer_cb, 500, 0);
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141 ASSERT_OK(r);
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142 nested--;
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143
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144 write_cb_called++;
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145 }
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146
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147
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148 static void connect_cb(uv_connect_t* req, int status) {
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149 uv_buf_t buf;
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150
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151 puts("Connected. Write some data to echo server...");
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152
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153 ASSERT_OK(status);
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154 ASSERT(nested == 0 && "connect_cb must be called from a fresh stack");
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155
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156 nested++;
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157
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158 buf.base = (char*) &MESSAGE;
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159 buf.len = sizeof MESSAGE;
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160
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161 if (uv_write(&write_req, (uv_stream_t*)req->handle, &buf, 1, write_cb)) {
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162 FATAL("uv_write failed");
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163 }
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164
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165 nested--;
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166
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167 connect_cb_called++;
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168 }
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169
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170
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171 TEST_IMPL(callback_stack) {
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172 struct sockaddr_in addr;
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173
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174 ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
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175
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176 if (uv_tcp_init(uv_default_loop(), &client)) {
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177 FATAL("uv_tcp_init failed");
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178 }
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179
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180 puts("Connecting...");
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181
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182 nested++;
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183
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184 if (uv_tcp_connect(&connect_req,
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185 &client,
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186 (const struct sockaddr*) &addr,
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187 connect_cb)) {
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188 FATAL("uv_tcp_connect failed");
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189 }
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190 nested--;
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191
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192 uv_run(uv_default_loop(), UV_RUN_DEFAULT);
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193
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194 ASSERT_OK(nested);
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195 ASSERT_NE(connect_cb_called == 1 && \
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196 "connect_cb must be called exactly once", 0);
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197 ASSERT_NE(write_cb_called == 1 && "write_cb must be called exactly once",
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198 0);
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199 ASSERT_NE(timer_cb_called == 1 && "timer_cb must be called exactly once",
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200 0);
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201 ASSERT_EQ(bytes_received, sizeof MESSAGE);
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202 ASSERT_NE(shutdown_cb_called == 1 && \
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203 "shutdown_cb must be called exactly once", 0);
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204 ASSERT_NE(close_cb_called == 2 && "close_cb must be called exactly twice",
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205 0);
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206
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207 MAKE_VALGRIND_HAPPY(uv_default_loop());
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208 return 0;
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209 }
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