| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | } |