test code for UV issue https://github.com/joyent/libuv/issues/443

test-tcp-dont-connect-after-write.c

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#include "uv.h"
#include "task.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


static uv_tcp_t conn;
static uv_connect_t connect_req;
static uv_write_t write_req;

static int connect_cb_called;
static int connect_cb_error_called;
static int write_cb_called;
static int write_cb_error_called;

static void connect_cb(uv_connect_t* req, int status);
static void write_cb(uv_write_t* req, int status);
static void close_cb(uv_handle_t* handle);

typedef struct {
  uv_write_t req;
  uv_buf_t buf;
} write_req_t;


static void connect_cb(uv_connect_t* req, int status) {
  printf("--- connect_cb(status = %d)\n", status);

  if (status == -1) {
    connect_cb_error_called++;
    uv_close((uv_handle_t *)req->handle, close_cb);
  }

  connect_cb_called++;
}


static void write_cb(uv_write_t* req, int status) {
  printf("--- write_cb(status = %d)\n", status);

  write_req_t* wr;
  wr = (write_req_t*) req;

  if (status == -1) {
    write_cb_error_called++;
  }

  free(wr->buf.base);
  free(wr);

  write_cb_called++;
}


static void close_cb(uv_handle_t* handle) {
  printf("--- close_cb()\n");
}


/*
 * Try to connect to an address in which nothing listens, get ECONNREFUSED
 * (uv errno 12) and get connect_cb() called once with status != 0.
 * Related issue: https://github.com/joyent/libuv/issues/443
 */
TEST_IMPL(tcp_dont_call_connect_status_0_after_write_when_connection_fails) {
  struct sockaddr_in addr;
  uv_buf_t buf;
  char* data;
  write_req_t* wr;
  int r;

  addr = uv_ip4_addr("127.0.0.1", 9999);

  r = uv_tcp_init(uv_default_loop(), &conn);
  ASSERT(r == 0);

  r = uv_tcp_connect(&connect_req, &conn, addr, connect_cb);
  ASSERT(r == 0);

  data = malloc(5);
  memcpy(data, "HELLO", 5);
  buf = uv_buf_init(data, 5);

  wr = (write_req_t*) malloc(sizeof *wr);
  wr->buf = buf;
  wr->req.data = data;

  r = uv_write(&write_req, (uv_stream_t*)&conn, &buf, 1, write_cb);
  ASSERT(r == 0);

  r = uv_run(uv_default_loop());
  ASSERT(r == 0);

  ASSERT(connect_cb_called == 1);
  ASSERT(connect_cb_error_called == 1);
  ASSERT(write_cb_called == 1);
  ASSERT(write_cb_error_called == 1);

  return 0;
}