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/* Test backtrace and backtrace_symbols.
Copyright (C) 2009-2025 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 <execinfo.h>
#include <search.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "tst-backtrace.h"
/* The backtrace should include at least f1, f2, f3, and do_test. */
#define NUM_FUNCTIONS 4
NO_INLINE void
fn1 (void)
{
void *addresses[NUM_FUNCTIONS];
char **symbols;
int n;
int i;
/* Get the backtrace addresses. */
n = backtrace (addresses, sizeof (addresses) / sizeof (addresses[0]));
printf ("Obtained backtrace with %d functions\n", n);
/* Check that there are at least four functions. */
if (n < NUM_FUNCTIONS)
{
FAIL ();
return;
}
/* Convert them to symbols. */
symbols = backtrace_symbols (addresses, n);
/* Check that symbols were obtained. */
if (symbols == NULL)
{
FAIL ();
return;
}
for (i = 0; i < n; ++i)
printf ("Function %d: %s\n", i, symbols[i]);
/* Check that the function names obtained are accurate. */
if (!match (symbols[0], "fn1"))
{
FAIL ();
return;
}
/* Symbol names are not available for static functions, so we do not
check f2. */
if (!match (symbols[2], "fn3"))
{
FAIL ();
return;
}
/* Symbol names are not available for static functions, so we do not
check do_test. */
}
NO_INLINE int
fn2 (void)
{
fn1 ();
/* Prevent tail calls. */
return x;
}
NO_INLINE int
fn3 (void)
{
fn2();
/* Prevent tail calls. */
return x;
}
NO_INLINE int
do_test (void)
{
/* Test BZ #18084. */
void *buffer[1];
if (backtrace (buffer, 0) != 0)
FAIL ();
fn3 ();
return ret;
}
#include <support/test-driver.c>
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