libuv-svace-build

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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to
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 * deal in the Software without restriction, including without limitation the
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 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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 * sell copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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 * IN THE SOFTWARE.
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 */
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/*
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 * TODO: Add explanation of why we want on_close to be called from fresh
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 * stack.
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 */
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#include "uv.h"
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#include "task.h"
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static const char MESSAGE[] = "Failure is for the weak. Everyone dies alone.";
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static uv_tcp_t client;
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static uv_timer_t timer;
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static uv_connect_t connect_req;
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static uv_write_t write_req;
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static uv_shutdown_t shutdown_req;
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static int nested = 0;
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static int close_cb_called = 0;
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static int connect_cb_called = 0;
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static int write_cb_called = 0;
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static int timer_cb_called = 0;
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static int bytes_received = 0;
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static int shutdown_cb_called = 0;
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static void alloc_cb(uv_handle_t* handle, size_t size, uv_buf_t* buf) {
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  buf->len = size;
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  buf->base = malloc(size);
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  ASSERT_NOT_NULL(buf->base);
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}
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static void close_cb(uv_handle_t* handle) {
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  ASSERT(nested == 0 && "close_cb must be called from a fresh stack");
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  close_cb_called++;
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}
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static void shutdown_cb(uv_shutdown_t* req, int status) {
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  ASSERT_OK(status);
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  ASSERT(nested == 0 && "shutdown_cb must be called from a fresh stack");
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  shutdown_cb_called++;
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}
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static void read_cb(uv_stream_t* tcp, ssize_t nread, const uv_buf_t* buf) {
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  ASSERT(nested == 0 && "read_cb must be called from a fresh stack");
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  printf("Read. nread == %d\n", (int)nread);
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  free(buf->base);
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  if (nread == 0) {
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    return;
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  } else if (nread < 0) {
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    ASSERT_EQ(nread, UV_EOF);
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    nested++;
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    uv_close((uv_handle_t*)tcp, close_cb);
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    nested--;
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    return;
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  }
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  bytes_received += nread;
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  /* We call shutdown here because when bytes_received == sizeof MESSAGE there
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   * will be no more data sent nor received, so here it would be possible for a
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   * backend to call shutdown_cb immediately and *not* from a fresh stack. */
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  if (bytes_received == sizeof MESSAGE) {
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    nested++;
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    puts("Shutdown");
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    if (uv_shutdown(&shutdown_req, (uv_stream_t*)tcp, shutdown_cb)) {
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      FATAL("uv_shutdown failed");
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    }
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    nested--;
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  }
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}
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static void timer_cb(uv_timer_t* handle) {
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  ASSERT_PTR_EQ(handle, &timer);
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  ASSERT(nested == 0 && "timer_cb must be called from a fresh stack");
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  puts("Timeout complete. Now read data...");
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  nested++;
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  if (uv_read_start((uv_stream_t*)&client, alloc_cb, read_cb)) {
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    FATAL("uv_read_start failed");
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  }
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  nested--;
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  timer_cb_called++;
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  uv_close((uv_handle_t*)handle, close_cb);
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}
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static void write_cb(uv_write_t* req, int status) {
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  int r;
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  ASSERT_OK(status);
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  ASSERT(nested == 0 && "write_cb must be called from a fresh stack");
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  puts("Data written. 500ms timeout...");
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  /* After the data has been sent, we're going to wait for a while, then start
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   * reading. This makes us certain that the message has been echoed back to
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   * our receive buffer when we start reading. This maximizes the temptation
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   * for the backend to use dirty stack for calling read_cb. */
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  nested++;
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  r = uv_timer_init(uv_default_loop(), &timer);
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  ASSERT_OK(r);
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  r = uv_timer_start(&timer, timer_cb, 500, 0);
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  ASSERT_OK(r);
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  nested--;
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  write_cb_called++;
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}
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static void connect_cb(uv_connect_t* req, int status) {
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  uv_buf_t buf;
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  puts("Connected. Write some data to echo server...");
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  ASSERT_OK(status);
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  ASSERT(nested == 0 && "connect_cb must be called from a fresh stack");
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  nested++;
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  buf.base = (char*) &MESSAGE;
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  buf.len = sizeof MESSAGE;
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  if (uv_write(&write_req, (uv_stream_t*)req->handle, &buf, 1, write_cb)) {
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    FATAL("uv_write failed");
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  }
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  nested--;
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  connect_cb_called++;
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}
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TEST_IMPL(callback_stack) {
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  struct sockaddr_in addr;
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  ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
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  if (uv_tcp_init(uv_default_loop(), &client)) {
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    FATAL("uv_tcp_init failed");
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  }
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  puts("Connecting...");
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  nested++;
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  if (uv_tcp_connect(&connect_req,
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                     &client,
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                     (const struct sockaddr*) &addr,
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                     connect_cb)) {
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    FATAL("uv_tcp_connect failed");
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  }
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  nested--;
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  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
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  ASSERT_OK(nested);
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  ASSERT_NE(connect_cb_called == 1 && \
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            "connect_cb must be called exactly once", 0);
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  ASSERT_NE(write_cb_called == 1 && "write_cb must be called exactly once",
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            0);
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  ASSERT_NE(timer_cb_called == 1 && "timer_cb must be called exactly once",
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            0);
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  ASSERT_EQ(bytes_received, sizeof MESSAGE);
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  ASSERT_NE(shutdown_cb_called == 1 && \
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            "shutdown_cb must be called exactly once", 0);
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  ASSERT_NE(close_cb_called == 2 && "close_cb must be called exactly twice",
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            0);
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  MAKE_VALGRIND_HAPPY(uv_default_loop());
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  return 0;
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}
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