1 /* Test unwinding through main.
2 Copyright (C) 2018-2021 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 #include <support/test-driver.h>
22
23 #if USE_PTHREADS
24 # include <pthread.h>
25 # include <error.h>
26 #endif
27
28 static _Unwind_Reason_Code
callback(struct _Unwind_Context * ctx,void * arg)29 callback (struct _Unwind_Context *ctx, void *arg)
30 {
31 return _URC_NO_REASON;
32 }
33
34 static void *
func(void * a)35 func (void *a)
36 {
37 /* Arrange for this test to be killed if _Unwind_Backtrace runs into an
38 endless loop. We cannot use the test driver because the complete
39 call chain needs to be compiled with -funwind-tables so that
40 _Unwind_Backtrace is able to reach the start routine. */
41 alarm (DEFAULT_TIMEOUT);
42 _Unwind_Backtrace (callback, 0);
43 return a;
44 }
45
46 int
main(void)47 main (void)
48 {
49 #if USE_PTHREADS
50 pthread_t thr;
51 int rc = pthread_create (&thr, NULL, &func, NULL);
52 if (rc)
53 error (1, rc, "pthread_create");
54 rc = pthread_join (thr, NULL);
55 if (rc)
56 error (1, rc, "pthread_join");
57 #else
58 func (NULL);
59 #endif
60 }
61