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fbbc9a4e | 1 | /* Tests of signal delivery on an alternate stack (_exit). |
d614a753 | 2 | Copyright (C) 2019-2020 Free Software Foundation, Inc. |
fbbc9a4e ZW |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
fbbc9a4e ZW |
18 | |
19 | #include <support/xsignal.h> | |
20 | #include <support/support.h> | |
21 | #include <support/check.h> | |
22 | #include <unistd.h> | |
23 | ||
24 | /* C2011 7.4.1.1p5 specifies that only the following operations are | |
25 | guaranteed to be well-defined inside an asynchronous signal handler: | |
26 | * any operation on a lock-free atomic object | |
27 | * assigning a value to an object declared as volatile sig_atomic_t | |
28 | * calling abort, _Exit, quick_exit, or signal | |
29 | * signal may only be called with its first argument equal to the | |
30 | number of the signal that caused the handler to be called | |
31 | ||
32 | We use this list as a guideline for the set of operations that ought | |
33 | also to be safe in a _synchronous_ signal delivered on an alternate | |
34 | signal stack with only MINSIGSTKSZ bytes of space. | |
35 | ||
36 | This test program tests calls to _exit, which is the same function | |
37 | as _Exit, but specified by POSIX rather than ISO C. For reasons | |
38 | unknown to the author of this program, the C committee did not | |
39 | think it could standardize _exit under that name; regardless, in a | |
40 | POSIX-conformant environment, they should be completely | |
41 | interchangeable. */ | |
42 | ||
43 | #define EXPECTED_STATUS 3 | |
44 | ||
45 | static void | |
46 | handler (int unused) | |
47 | { | |
48 | _exit (EXPECTED_STATUS); | |
49 | } | |
50 | ||
51 | int | |
52 | do_test (void) | |
53 | { | |
54 | void *sstk = xalloc_sigstack (0); | |
55 | struct sigaction sa; | |
56 | ||
57 | sa.sa_handler = handler; | |
58 | sa.sa_flags = SA_RESTART | SA_ONSTACK; | |
59 | sigfillset (&sa.sa_mask); | |
60 | if (sigaction (SIGUSR1, &sa, 0)) | |
61 | FAIL_RET ("sigaction (SIGUSR1, handler): %m\n"); | |
62 | ||
63 | raise (SIGUSR1); | |
64 | ||
65 | xfree_sigstack (sstk); | |
66 | FAIL_RET ("test process was not terminated by _exit in signal handler"); | |
67 | } | |
68 | ||
69 | #include <support/test-driver.c> |