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/* Smoke test for mallinfo2
Copyright (C) 2020-2025 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
<https://www.gnu.org/licenses/>. */
/* Test that mallinfo2 is properly exported and basically works. */
#include <array_length.h>
#include <malloc.h>
#include <stdlib.h>
#include <support/check.h>
#include "tst-malloc-aux.h"
/* This is not specifically needed for the test, but (1) does
something to the data so gcc doesn't optimize it away, and (2) may
help when developing future tests. */
static void
print_mi (const char *msg, struct mallinfo2 *m)
{
printf("\n%s...\n", msg);
#define P(f) printf("%s: %zu\n", #f, m->f)
P(arena);
P(ordblks);
P(smblks);
P(hblks);
P(hblkhd);
P(usmblks);
P(fsmblks);
P(uordblks);
P(fordblks);
P(keepcost);
}
/* We do this to force the call to malloc to not be optimized
away. */
volatile void *ptr;
static int
do_test (void)
{
struct mallinfo2 mi1, mi2;
int i;
size_t total = 0;
/* This is the key difference between mallinfo() and mallinfo2().
It may be a false positive if int and size_t are the same
size. */
TEST_COMPARE (sizeof (mi1.arena), sizeof (size_t));
mi1 = mallinfo2 ();
print_mi ("before", &mi1);
/* Allocations that are meaningful-sized but not so large as to be
mmapped, so that they're all accounted for in the field we test
below. */
for (i = 1; i < 20; ++i)
{
ptr = malloc (160 * i);
total += 160 * i;
}
mi2 = mallinfo2 ();
print_mi ("after", &mi2);
/* Check at least something changed. */
TEST_VERIFY (mi2.uordblks >= mi1.uordblks + total);
return 0;
}
#include <support/test-driver.c>
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