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
27static volatile uintptr_t handler_stackaddr;
28
29static void
30handler (int unused)
31{
32 int var;
33 handler_stackaddr = (uintptr_t) &var;
34}
35
36int
37do_test (void)
38{
39 void *sstk = xalloc_sigstack (size: 0);
40
41 unsigned char *sp;
42 size_t size;
43 xget_sigstack_location (stack: sstk, addrp: &sp, sizep: &size);
44 printf (format: "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 (set: &sa.sa_mask);
50 if (sigaction (SIGUSR1, act: &sa, oact: 0))
51 FAIL_RET ("sigaction (SIGUSR1, handler): %m\n");
52
53 raise (SIGUSR1);
54
55 uintptr_t haddr = handler_stackaddr;
56 printf (format: "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 (stack: sstk);
61 return 0;
62}
63
64#include <support/test-driver.c>
65

source code of glibc/support/tst-xsigstack.c