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resolv: Introduce free list for resolv_conf index slosts

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This commit is contained in:
Florian Weimer
2017-07-03 15:01:34 +02:00
parent aef16cc8a4
commit e237357a5a
4 changed files with 142 additions and 32 deletions
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74
resolv/tst-resolv-res_ninit.c Normal file
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/* Test the creation of many struct __res_state objects.
Copyright (C) 2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <mcheck.h>
#include <resolv.h>
#include <resolv/resolv_context.h>
#include <stdlib.h>
#include <support/check.h>
/* Order the resolver states by their extended resolver state
index. */
static int
sort_res_state (const void *a, const void *b)
{
res_state left = (res_state) a;
res_state right = (res_state) b;
return memcmp (&left->_u._ext.__glibc_extension_index,
&right->_u._ext.__glibc_extension_index,
sizeof (left->_u._ext.__glibc_extension_index));
}
static int
do_test (void)
{
mtrace ();
enum { count = 100 * 1000 };
res_state array = calloc (count, sizeof (*array));
const struct resolv_conf *conf = NULL;
for (size_t i = 0; i < count; ++i)
{
TEST_VERIFY (res_ninit (array + i) == 0);
TEST_VERIFY (array[i].nscount > 0);
struct resolv_context *ctx = __resolv_context_get_override (array + i);
TEST_VERIFY_EXIT (ctx != NULL);
TEST_VERIFY (ctx->resp == array + i);
if (i == 0)
{
conf = ctx->conf;
TEST_VERIFY (conf != NULL);
}
else
/* The underyling configuration should be identical across all
res_state opjects because resolv.conf did not change. */
TEST_VERIFY (ctx->conf == conf);
}
qsort (array, count, sizeof (*array), sort_res_state);
for (size_t i = 1; i < count; ++i)
/* All extension indices should be different. */
TEST_VERIFY (sort_res_state (array + i - 1, array + i) < 0);
for (size_t i = 0; i < count; ++i)
res_nclose (array + i);
free (array);
TEST_VERIFY (res_init () == 0);
return 0;
}
#include <support/test-driver.c>