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 |
30 | handler (int unused) |
31 | { |
32 | int var; |
33 | handler_stackaddr = (uintptr_t) &var; |
34 | } |
35 | |
36 | int |
37 | do_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 | |