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README.md

uv_read_start() bug?

CMakeLists.txt

cmake_minimum_required(VERSION 3.5)
project(read_start_bug)

list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}")

include(FindLibuv)

list(APPEND LIBRARIES ${LIBUV_LIBRARIES})
list(APPEND INCLUDE_DIRS ${LIBUV_INCLUDE_DIRS})

add_executable(read_start_bug read_start_bug.c)

target_include_directories(read_start_bug PRIVATE ${INCLUDE_DIRS})
target_link_libraries(read_start_bug ${LIBRARIES})

FindLibuv.cmake

find_package(PkgConfig)
if (PKG_CONFIG_FOUND)
  pkg_check_modules(PC_LIBUV QUIET libuv)
endif()

set(LIBUV_HINTS ${LIBUV_ROOT_DIR} ENV LIBUV_ROOT_DIR)

find_path(LIBUV_INCLUDE_DIR NAMES uv.h 
  HINTS ${LIBUV_HINTS}
  PATH_SUFFIXES include)

find_library(LIBUV_LIBRARY NAMES uv libuv
  HINTS ${LIBUV_HINTS}
  PATH_SUFFIXES lib)

mark_as_advanced(LIBUV_INCLUDE_DIR LIBUV_LIBRARY)

set(LIBUV_LIBRARIES ${LIBUV_LIBRARY})
set(LIBUV_INCLUDE_DIRS ${LIBUV_INCLUDE_DIR})

include(FindPackageHandleStandardArgs)

find_package_handle_standard_args(Libuv DEFAULT_MSG
                                  LIBUV_LIBRARY LIBUV_INCLUDE_DIR)

mark_as_advanced(LIBUV_INCLUDE_DIR LIBUV_LIBRARY)

read_start_bug.c

#include <stdlib.h>
#include <uv.h>

#define ASSERT(x)                                                              \
  do {                                                                         \
    if (!(x)) {                                                                \
      fprintf(stderr, "'" #x "' failed on line %d\n", __LINE__);               \
      abort();                                                                 \
    }                                                                          \
  } while (0);


static uv_tcp_t server;
static uv_tcp_t connection;

static uv_tcp_t client;
static uv_connect_t connect_req;

static void on_write_close_immediately(uv_write_t *req, int status) {
  ASSERT(0 == status);
  uv_close((uv_handle_t*)req->handle, NULL); /* Close immediately */
  free(req);
}

static void on_write(uv_write_t* req, int status) {
  ASSERT(0 == status);
  free(req);
}

static void do_write(uv_stream_t *stream, uv_write_cb cb) {
  uv_write_t *req = (uv_write_t *)malloc(sizeof(uv_write_t));
  uv_buf_t buf;
  buf.base = "1234578";
  buf.len = 8;
  ASSERT(0 == uv_write(req, stream, &buf, 1, cb));
}

static void on_alloc(uv_handle_t *handle, size_t suggested_size,
                     uv_buf_t *buf) {
  static char slab[65536];
  buf->base = slab;
  buf->len = sizeof(slab);
}

static void on_read2(uv_stream_t* stream, ssize_t nread, const uv_buf_t* buf);

static void on_read1(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) {
  ASSERT(nread >= 0);

  do_write(stream, on_write);

  ASSERT(0 == uv_read_stop(stream));

  ASSERT(0 == uv_read_start(stream, on_alloc, on_read2));
}

static void on_read2(uv_stream_t* stream, ssize_t nread, const uv_buf_t* buf) {
  uv_close((uv_handle_t*)stream, NULL);
  uv_close((uv_handle_t*)&server, NULL);
}

static void on_connection(uv_stream_t *server, int status) {
  ASSERT(0 == status);

  ASSERT(0 == uv_tcp_init(server->loop, &connection));

  ASSERT(0 == uv_accept(server, (uv_stream_t *)&connection));

  ASSERT(0 == uv_read_start((uv_stream_t *)&connection, on_alloc, on_read1));
}

static void on_connect(uv_connect_t *req, int status) {
  ASSERT(0 == status);

  do_write((uv_stream_t*)&client, on_write_close_immediately);
}

int main() {
  uv_loop_t loop;

  ASSERT(0 == uv_loop_init(&loop));

  { /* Server */
    struct sockaddr_in addr;

    ASSERT(0 == uv_ip4_addr("0.0.0.0", 8080, &addr));

    ASSERT(0 == uv_tcp_init(&loop, &server));

    ASSERT(0 == uv_tcp_bind(&server, (struct sockaddr*) & addr, 0));

    ASSERT(0 == uv_listen((uv_stream_t*)&server, 10, on_connection));
  }

  { /* Client */
    struct sockaddr_in addr;

    ASSERT(0 == uv_ip4_addr("0.0.0.0", 8080, &addr));
    ASSERT(0 == uv_tcp_init(&loop, &client));

    ASSERT(0 == uv_tcp_connect(&connect_req, &client,
      (const struct sockaddr*) & addr, on_connect));
  }

  uv_run(&loop, UV_RUN_DEFAULT);
}