1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2016, Cyril Bur, IBM Corp.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Sending one self a signal should always get delivered.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <signal.h>
9*4882a593Smuzhiyun #include <stdio.h>
10*4882a593Smuzhiyun #include <stdlib.h>
11*4882a593Smuzhiyun #include <string.h>
12*4882a593Smuzhiyun #include <sys/types.h>
13*4882a593Smuzhiyun #include <sys/wait.h>
14*4882a593Smuzhiyun #include <unistd.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include <altivec.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include "utils.h"
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #define MAX_ATTEMPT 500000
21*4882a593Smuzhiyun #define TIMEOUT 5
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun extern long signal_self(pid_t pid, int sig);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun static sig_atomic_t signaled;
26*4882a593Smuzhiyun static sig_atomic_t fail;
27*4882a593Smuzhiyun
signal_handler(int sig)28*4882a593Smuzhiyun static void signal_handler(int sig)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun if (sig == SIGUSR1)
31*4882a593Smuzhiyun signaled = 1;
32*4882a593Smuzhiyun else
33*4882a593Smuzhiyun fail = 1;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
test_signal()36*4882a593Smuzhiyun static int test_signal()
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun int i;
39*4882a593Smuzhiyun struct sigaction act;
40*4882a593Smuzhiyun pid_t ppid = getpid();
41*4882a593Smuzhiyun pid_t pid;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun act.sa_handler = signal_handler;
44*4882a593Smuzhiyun act.sa_flags = 0;
45*4882a593Smuzhiyun sigemptyset(&act.sa_mask);
46*4882a593Smuzhiyun if (sigaction(SIGUSR1, &act, NULL) < 0) {
47*4882a593Smuzhiyun perror("sigaction SIGUSR1");
48*4882a593Smuzhiyun exit(1);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun if (sigaction(SIGALRM, &act, NULL) < 0) {
51*4882a593Smuzhiyun perror("sigaction SIGALRM");
52*4882a593Smuzhiyun exit(1);
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun /* Don't do this for MAX_ATTEMPT, its simply too long */
56*4882a593Smuzhiyun for(i = 0; i < 1000; i++) {
57*4882a593Smuzhiyun pid = fork();
58*4882a593Smuzhiyun if (pid == -1) {
59*4882a593Smuzhiyun perror("fork");
60*4882a593Smuzhiyun exit(1);
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun if (pid == 0) {
63*4882a593Smuzhiyun signal_self(ppid, SIGUSR1);
64*4882a593Smuzhiyun exit(1);
65*4882a593Smuzhiyun } else {
66*4882a593Smuzhiyun alarm(0); /* Disable any pending */
67*4882a593Smuzhiyun alarm(2);
68*4882a593Smuzhiyun while (!signaled && !fail)
69*4882a593Smuzhiyun asm volatile("": : :"memory");
70*4882a593Smuzhiyun if (!signaled) {
71*4882a593Smuzhiyun fprintf(stderr, "Didn't get signal from child\n");
72*4882a593Smuzhiyun FAIL_IF(1); /* For the line number */
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun /* Otherwise we'll loop too fast and fork() will eventually fail */
75*4882a593Smuzhiyun waitpid(pid, NULL, 0);
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun for (i = 0; i < MAX_ATTEMPT; i++) {
80*4882a593Smuzhiyun long rc;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun alarm(0); /* Disable any pending */
83*4882a593Smuzhiyun signaled = 0;
84*4882a593Smuzhiyun alarm(TIMEOUT);
85*4882a593Smuzhiyun rc = signal_self(ppid, SIGUSR1);
86*4882a593Smuzhiyun if (rc) {
87*4882a593Smuzhiyun fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx",
88*4882a593Smuzhiyun i, fail, rc);
89*4882a593Smuzhiyun FAIL_IF(1); /* For the line number */
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun while (!signaled && !fail)
92*4882a593Smuzhiyun asm volatile("": : :"memory");
93*4882a593Smuzhiyun if (!signaled) {
94*4882a593Smuzhiyun fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx",
95*4882a593Smuzhiyun i, fail, rc);
96*4882a593Smuzhiyun FAIL_IF(1); /* For the line number */
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun return 0;
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
main(void)103*4882a593Smuzhiyun int main(void)
104*4882a593Smuzhiyun {
105*4882a593Smuzhiyun test_harness_set_timeout(300);
106*4882a593Smuzhiyun return test_harness(test_signal, "signal");
107*4882a593Smuzhiyun }
108