1/*
2 * Copyright (c) 2015  Philip Guenther <guenther@openbsd.org>
3 *
4 * Public domain.
5 *
6 * Verify that SIGTHR can't be blocked or caught by applications.
7 */
8
9#include <err.h>
10#include <errno.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <string.h>
14#include <signal.h>
15
16void sighandler(int sig) { }
17
18int
19main(void)
20{
21	struct sigaction sa;
22	sigset_t set, oset;
23
24	/*
25	 * check sigprocmask
26	 */
27	if (sigprocmask(SIG_BLOCK, NULL, &set))
28		err(1, "sigprocmask");
29	if (sigismember(&set, SIGTHR))
30		errx(1, "SIGTHR already blocked");
31	sigaddset(&set, SIGTHR);
32	if (sigprocmask(SIG_BLOCK, &set, NULL))
33		err(1, "sigprocmask");
34	if (sigprocmask(SIG_SETMASK, &set, &oset))
35		err(1, "sigprocmask");
36	if (sigismember(&oset, SIGTHR))
37		errx(1, "SIGTHR blocked with SIG_BLOCK");
38	if (sigprocmask(SIG_BLOCK, NULL, &oset))
39		err(1, "sigprocmask");
40	if (sigismember(&oset, SIGTHR))
41		errx(1, "SIGTHR blocked with SIG_SETMASK");
42
43	/*
44	 * check sigaction
45	 */
46	if (sigaction(SIGTHR, NULL, &sa) == 0)
47		errx(1, "sigaction(SIGTHR) succeeded");
48	else if (errno != EINVAL)
49		err(1, "sigaction(SIGTHR) didn't fail with EINVAL");
50	memset(&sa, 0, sizeof sa);
51	sa.sa_handler = sighandler;
52	sigfillset(&sa.sa_mask);
53	sa.sa_flags = 0;
54	if (sigaction(SIGTHR, &sa, NULL) == 0)
55		errx(1, "sigaction(SIGTHR) succeeded");
56	else if (errno != EINVAL)
57		err(1, "sigaction(SIGTHR) didn't fail with EINVAL");
58	if (sigaction(SIGUSR1, &sa, NULL))
59		err(1, "sigaction(SIGUSR1)");
60	if (sigaction(SIGUSR1, NULL, &sa))
61		err(1, "sigaction(SIGUSR1)");
62	if (sigismember(&sa.sa_mask, SIGTHR))
63		errx(1, "SIGTHR blocked with sigaction");
64
65	return 0;
66}
67