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

source code of linux/tools/testing/selftests/powerpc/signal/signal.c