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/**
* @file tests/Gtest-nomalloc.c
*
* Verify that @c malloc() is not called during an unwinding operation.
*/
/*
* This file is part of libunwind.
* Copyright 2025 Stephen M. Webb <stephen.webb@bregmasoft.ca>
* Copyright (C) 2009 Google, Inc
* Contributed by Arun Sharma <arun.sharma@google.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <dlfcn.h>
#include <libunwind.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "unw_test.h"
int malloc_call_count;
int in_unwind;
/**
* Intercepted malloc() call.
*
* If invoked during unwinding this call will increment the test error count
* and indicate a failure by returning NULL. Otherwise it just calls the real
* malloc().
*/
void *
malloc (size_t sz)
{
typedef void *(*malloc_t) (size_t);
static malloc_t real_malloc = NULL;
if (real_malloc == NULL)
{
real_malloc = (malloc_t)(intptr_t)dlsym (RTLD_NEXT, "malloc");
if (real_malloc == NULL)
{
fprintf (stderr, "no malloc() found\n");
exit (UNW_TEST_EXIT_HARD_ERROR); \
}
}
if (in_unwind)
{
malloc_call_count++;
}
return real_malloc (sz);
}
static void
do_backtrace (void)
{
unw_cursor_t cursor;
unw_context_t uc;
int ret;
in_unwind = 1;
unw_getcontext (&uc);
if (unw_init_local (&cursor, &uc) < 0)
{
fprintf (stderr, "unw_init_local failed!\n");
exit (UNW_TEST_EXIT_HARD_ERROR); \
}
do
{
ret = unw_step (&cursor);
}
while (ret > 0);
in_unwind = 0;
}
void
foo3 (void)
{
do_backtrace ();
}
void
foo2 (void)
{
foo3 ();
}
void
foo1 (void)
{
foo2 ();
}
int
main (void)
{
foo1 ();
if (malloc_call_count > 0)
{
fprintf (stderr, "FAILURE: malloc called %d times, expected 0\n", malloc_call_count);
exit (UNW_TEST_EXIT_FAIL);
}
exit (UNW_TEST_EXIT_PASS);
}
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