1 /* Unit test for _Unwind_Backtrace in a shared object constructor.
2 Copyright (C) 2018-2022 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 <unwind.h>
20 #include <unistd.h>
21
22 static _Unwind_Reason_Code
callback(struct _Unwind_Context * ctx,void * arg)23 callback (struct _Unwind_Context *ctx, void *arg)
24 {
25 return _URC_NO_REASON;
26 }
27
28 static void
29 __attribute__ ((constructor))
do_unwind(void)30 do_unwind (void)
31 {
32 /* Arrange for this test to be killed if _Unwind_Backtrace runs into an
33 endless loop. We cannot use the test driver since the test needs to
34 run in a constructor. */
35 alarm (20);
36 _Unwind_Backtrace (callback, 0);
37 }
38
39 void
dummy(void)40 dummy (void)
41 {
42 }
43