1/* Test backtrace and backtrace_symbols for recursive calls.
2 Copyright (C) 2010-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <execinfo.h>
20#include <search.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24
25#include "tst-backtrace.h"
26
27/* The backtrace should include at least 3 * fn, and do_test. */
28#define NUM_FUNCTIONS 4
29
30NO_INLINE int
31fn (int c)
32{
33 void *addresses[NUM_FUNCTIONS];
34 char **symbols;
35 int n;
36 int i;
37
38 if (c > 0)
39 {
40 fn (c: c - 1);
41 return x;
42 }
43 /* Get the backtrace addresses. */
44 n = backtrace (array: addresses, size: sizeof (addresses) / sizeof (addresses[0]));
45 printf (format: "Obtained backtrace with %d functions\n", n);
46 /* Check that there are at least four functions. */
47 if (n < NUM_FUNCTIONS)
48 {
49 FAIL ();
50 return 1;
51 }
52 /* Convert them to symbols. */
53 symbols = backtrace_symbols (array: addresses, size: n);
54 /* Check that symbols were obtained. */
55 if (symbols == NULL)
56 {
57 FAIL ();
58 return 1;
59 }
60 for (i = 0; i < n; ++i)
61 printf (format: "Function %d: %s\n", i, symbols[i]);
62 /* Check that the function names obtained are accurate. */
63 for (i = 0; i < n - 1; ++i)
64 if (!match (sym: symbols[i], name: "fn"))
65 {
66 FAIL ();
67 return 1;
68 }
69 /* Symbol names are not available for static functions, so we do not
70 check do_test. */
71 return x;
72}
73
74NO_INLINE int
75do_test (void)
76{
77 fn (c: 2);
78 return ret;
79}
80
81#include <support/test-driver.c>
82

source code of glibc/debug/tst-backtrace3.c