1 /* Test of sigaltstack wrappers.
2 Copyright (C) 2019-2022 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 <support/xsignal.h>
20 #include <support/support.h>
21 #include <support/xunistd.h>
22 #include <support/check.h>
23
24 #include <stdint.h>
25 #include <stdio.h>
26
27 static volatile uintptr_t handler_stackaddr;
28
29 static void
handler(int unused)30 handler (int unused)
31 {
32 int var;
33 handler_stackaddr = (uintptr_t) &var;
34 }
35
36 int
do_test(void)37 do_test (void)
38 {
39 void *sstk = xalloc_sigstack (0);
40
41 unsigned char *sp;
42 size_t size;
43 xget_sigstack_location (sstk, &sp, &size);
44 printf ("signal stack installed: sp=%p size=%zu\n", sp, size);
45
46 struct sigaction sa;
47 sa.sa_handler = handler;
48 sa.sa_flags = SA_RESTART | SA_ONSTACK;
49 sigfillset (&sa.sa_mask);
50 if (sigaction (SIGUSR1, &sa, 0))
51 FAIL_RET ("sigaction (SIGUSR1, handler): %m\n");
52
53 raise (SIGUSR1);
54
55 uintptr_t haddr = handler_stackaddr;
56 printf ("address of handler local variable: %p\n", (void *)haddr);
57 TEST_VERIFY ((uintptr_t)sp < haddr);
58 TEST_VERIFY (haddr < (uintptr_t)sp + size);
59
60 xfree_sigstack (sstk);
61 return 0;
62 }
63
64 #include <support/test-driver.c>
65