resolv/tst-resolv-res_init-multi.c

   1 /* Multi-threaded test for resolver initialization.
   2    Copyright (C) 2017-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <netdb.h>
  20 #include <resolv.h>
  21 #include <stdlib.h>
  22 #include <support/check.h>
  23 #include <support/support.h>
  24 #include <support/xthread.h>
  25
  26 /* Whether name lookups succeed does not really matter.  We use this
  27    to trigger initialization of the resolver.  */
  28 static const char *test_hostname = "www.gnu.org";
  29
  30 /* The different initialization methods.  */
  31 enum test_type { init, byname, gai };
  32 enum { type_count = 3 };
  33
  34 /* Thread function.  Perform a few resolver options.  */
  35 static void *
  36 thread_func (void *closure)
  37 {
  38   enum test_type *ptype = closure;
  39   /* Perform a few calls to the requested operation.  */
  40   TEST_VERIFY (*ptype >= 0);
  41   TEST_VERIFY (*ptype < (int) type_count);
  42   for (int i = 0; i < 3; ++i)
  43     switch (*ptype)
  44       {
  45       case init:
  46         res_init ();
  47         break;
  48       case byname:
  49         gethostbyname (test_hostname);
  50         break;
  51       case gai:
  52         {
  53           struct addrinfo hints = { 0, };
  54           struct addrinfo *ai = NULL;
  55           if (getaddrinfo (test_hostname, "80", &hints, &ai) == 0)
  56             freeaddrinfo (ai);
  57         }
  58         break;
  59       }
  60   free (ptype);
  61   return NULL;
  62 }
  63
  64 static int
  65 do_test (void)
  66 {
  67   /* Start a small number of threads which perform resolver
  68      operations.  */
  69   enum { thread_count = 30 };
  70
  71   pthread_t threads[thread_count];
  72   for (int i = 0; i < thread_count; ++i)
  73     {
  74       enum test_type *ptype = xmalloc (sizeof (*ptype));
  75       *ptype = i % type_count;
  76       threads[i] = xpthread_create (NULL, thread_func, ptype);
  77     }
  78   for (int i = 0; i < type_count; ++i)
  79     {
  80       enum test_type *ptype = xmalloc (sizeof (*ptype));
  81       *ptype = i;
  82       thread_func (ptype);
  83     }
  84   for (int i = 0; i < thread_count; ++i)
  85     xpthread_join (threads[i]);
  86   return 0;
  87 }
  88
  89 #include <support/test-driver.c>