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
sighandler(int sig)16 void sighandler(int sig) { }
17
18 int
main(void)19 main(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