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      1 /* Copyright The libuv project and contributors. All rights reserved.
      2  *
      3  * Permission is hereby granted, free of charge, to any person obtaining a copy
      4  * of this software and associated documentation files (the "Software"), to
      5  * deal in the Software without restriction, including without limitation the
      6  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
      7  * sell copies of the Software, and to permit persons to whom the Software is
      8  * furnished to do so, subject to the following conditions:
      9  *
     10  * The above copyright notice and this permission notice shall be included in
     11  * all copies or substantial portions of the Software.
     12  *
     13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     16  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     17  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     18  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     19  * IN THE SOFTWARE.
     20  */
     21 
     22 #include "uv.h"
     23 #include "task.h"
     24 
     25 #include <stdio.h>
     26 #include <stdlib.h>
     27 #include <string.h>
     28 
     29 #define CHECK_OBJECT(handle, type, parent) \
     30   ASSERT_PTR_EQ((type*)(handle), &(parent))
     31 
     32 static uv_udp_t client;
     33 static uv_idle_t idle_handle;
     34 static uv_udp_send_t send_req;
     35 static uv_buf_t buf;
     36 static struct sockaddr_in addr;
     37 static char send_data[1024];
     38 
     39 static int loop_hang_called;
     40 
     41 static void send_cb(uv_udp_send_t* req, int status);
     42 
     43 
     44 static void idle_cb(uv_idle_t* handle) {
     45   int r;
     46 
     47   ASSERT_NULL(send_req.handle);
     48   CHECK_OBJECT(handle, uv_idle_t, idle_handle);
     49   ASSERT_OK(uv_idle_stop(handle));
     50 
     51   /* It probably would have stalled by now if it's going to stall at all. */
     52   if (++loop_hang_called > 1000) {
     53     uv_close((uv_handle_t*) &client, NULL);
     54     uv_close((uv_handle_t*) &idle_handle, NULL);
     55     return;
     56   }
     57 
     58   r = uv_udp_send(&send_req,
     59                   &client,
     60                   &buf,
     61                   1,
     62                   (const struct sockaddr*) &addr,
     63                   send_cb);
     64   ASSERT_OK(r);
     65 }
     66 
     67 
     68 static void send_cb(uv_udp_send_t* req, int status) {
     69   ASSERT_NOT_NULL(req);
     70   ASSERT(status == 0 || status == UV_ENETUNREACH);
     71   CHECK_OBJECT(req->handle, uv_udp_t, client);
     72   CHECK_OBJECT(req, uv_udp_send_t, send_req);
     73   req->handle = NULL;
     74 
     75   ASSERT_OK(uv_idle_start(&idle_handle, idle_cb));
     76 }
     77 
     78 
     79 TEST_IMPL(udp_send_hang_loop) {
     80   ASSERT_OK(uv_idle_init(uv_default_loop(), &idle_handle));
     81 
     82   /* 192.0.2.0/24 is "TEST-NET" and reserved for documentation.
     83    * Good for us, though. Since we want to have something unreachable.
     84    */
     85   ASSERT_OK(uv_ip4_addr("192.0.2.3", TEST_PORT, &addr));
     86 
     87   ASSERT_OK(uv_udp_init(uv_default_loop(), &client));
     88 
     89   buf = uv_buf_init(send_data, sizeof(send_data));
     90 
     91   ASSERT_OK(uv_idle_start(&idle_handle, idle_cb));
     92 
     93   uv_run(uv_default_loop(), UV_RUN_DEFAULT);
     94 
     95   ASSERT_GT(loop_hang_called, 1000);
     96 
     97   MAKE_VALGRIND_HAPPY(uv_default_loop());
     98   return 0;
     99 }
    100