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/* Minimal tests to verify libc_malloc_debug.so functionality.
Copyright (C) 2021-2025 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/>. */
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <shlib-compat.h>
#include <libc-diag.h>
#include <support/check.h>
#include <support/support.h>
#include "tst-malloc-aux.h"
extern void (*volatile __free_hook) (void *, const void *);
extern void *(*volatile __malloc_hook)(size_t, const void *);
extern void *(*volatile __realloc_hook)(void *, size_t, const void *);
extern void *(*volatile __memalign_hook)(size_t, size_t, const void *);
int hook_count, call_count;
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations");
void
free_called (void *mem, const void *address)
{
hook_count++;
__free_hook = NULL;
free (mem);
__free_hook = free_called;
}
void *
malloc_called (size_t bytes, const void *address)
{
hook_count++;
__malloc_hook = NULL;
void *mem = malloc (bytes);
__malloc_hook = malloc_called;
return mem;
}
void *
realloc_called (void *oldptr, size_t bytes, const void *address)
{
hook_count++;
__realloc_hook = NULL;
void *mem = realloc (oldptr, bytes);
__realloc_hook = realloc_called;
return mem;
}
void *
calloc_called (size_t n, size_t size, const void *address)
{
hook_count++;
__malloc_hook = NULL;
void *mem = calloc (n, size);
__malloc_hook = malloc_called;
return mem;
}
void *
memalign_called (size_t align, size_t size, const void *address)
{
hook_count++;
__memalign_hook = NULL;
void *mem = memalign (align, size);
__memalign_hook = memalign_called;
return mem;
}
static void initialize_hooks (void)
{
__free_hook = free_called;
__malloc_hook = malloc_called;
__realloc_hook = realloc_called;
__memalign_hook = memalign_called;
}
void (*__malloc_initialize_hook) (void) = initialize_hooks;
compat_symbol_reference (libc, __malloc_initialize_hook,
__malloc_initialize_hook, GLIBC_2_0);
compat_symbol_reference (libc, __free_hook,
__free_hook, GLIBC_2_0);
compat_symbol_reference (libc, __malloc_hook,
__malloc_hook, GLIBC_2_0);
compat_symbol_reference (libc, __realloc_hook,
__realloc_hook, GLIBC_2_0);
compat_symbol_reference (libc, __memalign_hook,
__memalign_hook, GLIBC_2_0);
DIAG_POP_NEEDS_COMMENT;
static int
do_test (void)
{
void *p;
p = malloc (0);
TEST_VERIFY_EXIT (p != NULL);
call_count++;
p = realloc (p, 0);
TEST_VERIFY_EXIT (p == NULL);
call_count++;
p = calloc (512, 1);
TEST_VERIFY_EXIT (p != NULL);
call_count++;
free (p);
call_count++;
p = memalign (0x100, 0x100);
TEST_VERIFY_EXIT (p != NULL);
call_count++;
free (p);
call_count++;
printf ("call_count: %d, hook_count: %d\n", call_count, hook_count);
#ifdef HOOKS_ENABLED
TEST_VERIFY_EXIT (call_count == hook_count);
#else
TEST_VERIFY_EXIT (hook_count == 0);
#endif
exit (0);
}
#include <support/test-driver.c>
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