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