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 | |
23 | extern long signal_self(pid_t pid, int sig); |
24 | |
25 | static sig_atomic_t signaled; |
26 | static sig_atomic_t fail; |
27 | |
28 | static void signal_handler(int sig) |
29 | { |
30 | if (sig == SIGUSR1) |
31 | signaled = 1; |
32 | else |
33 | fail = 1; |
34 | } |
35 | |
36 | static 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 | |
103 | int main(void) |
104 | { |
105 | test_harness_set_timeout(300); |
106 | return test_harness(test_signal, "signal" ); |
107 | } |
108 | |