1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * Description:
6 * Verify the basic function of sigsuspend():
7 * 1) sigsuspend() can replace process's current signal mask
8 * by the specified signal mask and suspend the process
9 * execution until the delivery of a signal.
10 * 2) sigsuspend() should return after the execution of signal
11 * handler and restore the previous signal mask.
12 */
13
14 #include <errno.h>
15 #include <unistd.h>
16 #include <string.h>
17 #include <signal.h>
18
19 #include "tst_test.h"
20
21 static sigset_t signalset, sigset1, sigset2;
22 static volatile sig_atomic_t alarm_num;
23
sig_handler(int sig)24 static void sig_handler(int sig)
25 {
26 alarm_num = sig;
27 }
28
verify_sigsuspend(void)29 static void verify_sigsuspend(void)
30 {
31 alarm_num = 0;
32
33 SAFE_SIGFILLSET(&sigset2);
34
35 alarm(1);
36
37 /* Unblock SIGALRM */
38 TEST(sigsuspend(&signalset));
39
40 alarm(0);
41
42 if (TST_RET != -1 || TST_ERR != EINTR) {
43 tst_res(TFAIL | TTERRNO,
44 "sigsuspend() returned value %ld", TST_RET);
45 return;
46 }
47
48 if (alarm_num != SIGALRM) {
49 tst_res(TFAIL, "sigsuspend() didn't unblock SIGALRM");
50 return;
51 }
52
53 SAFE_SIGPROCMASK(0, NULL, &sigset2);
54 if (memcmp(&sigset1, &sigset2, sizeof(unsigned long))) {
55 tst_res(TFAIL, "sigsuspend() failed to "
56 "restore the previous signal mask");
57 return;
58 }
59
60 tst_res(TPASS, "sigsuspend() succeeded");
61 }
62
setup(void)63 static void setup(void)
64 {
65 SAFE_SIGEMPTYSET(&signalset);
66 SAFE_SIGEMPTYSET(&sigset1);
67 SAFE_SIGADDSET(&sigset1, SIGALRM);
68
69 struct sigaction sa_new = {
70 .sa_handler = sig_handler,
71 };
72
73 SAFE_SIGACTION(SIGALRM, &sa_new, 0);
74
75 /* Block SIGALRM */
76 SAFE_SIGPROCMASK(SIG_SETMASK, &sigset1, NULL);
77 }
78
79 static struct tst_test test = {
80 .setup = setup,
81 .test_all = verify_sigsuspend,
82 };
83