// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2016, Cyril Bur, IBM Corp.
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*
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* Sending one self a signal should always get delivered.
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*/
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <altivec.h>
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#include "utils.h"
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#define MAX_ATTEMPT 500000
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#define TIMEOUT 5
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extern long signal_self(pid_t pid, int sig);
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static sig_atomic_t signaled;
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static sig_atomic_t fail;
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static void signal_handler(int sig)
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{
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if (sig == SIGUSR1)
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signaled = 1;
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else
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fail = 1;
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}
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static int test_signal()
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{
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int i;
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struct sigaction act;
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pid_t ppid = getpid();
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pid_t pid;
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act.sa_handler = signal_handler;
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act.sa_flags = 0;
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sigemptyset(&act.sa_mask);
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if (sigaction(SIGUSR1, &act, NULL) < 0) {
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perror("sigaction SIGUSR1");
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exit(1);
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}
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if (sigaction(SIGALRM, &act, NULL) < 0) {
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perror("sigaction SIGALRM");
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exit(1);
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}
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/* Don't do this for MAX_ATTEMPT, its simply too long */
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for(i = 0; i < 1000; i++) {
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pid = fork();
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if (pid == -1) {
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perror("fork");
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exit(1);
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}
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if (pid == 0) {
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signal_self(ppid, SIGUSR1);
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exit(1);
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} else {
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alarm(0); /* Disable any pending */
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alarm(2);
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while (!signaled && !fail)
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asm volatile("": : :"memory");
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if (!signaled) {
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fprintf(stderr, "Didn't get signal from child\n");
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FAIL_IF(1); /* For the line number */
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}
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/* Otherwise we'll loop too fast and fork() will eventually fail */
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waitpid(pid, NULL, 0);
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}
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}
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for (i = 0; i < MAX_ATTEMPT; i++) {
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long rc;
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alarm(0); /* Disable any pending */
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signaled = 0;
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alarm(TIMEOUT);
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rc = signal_self(ppid, SIGUSR1);
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if (rc) {
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fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx",
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i, fail, rc);
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FAIL_IF(1); /* For the line number */
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}
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while (!signaled && !fail)
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asm volatile("": : :"memory");
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if (!signaled) {
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fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx",
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i, fail, rc);
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FAIL_IF(1); /* For the line number */
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}
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}
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return 0;
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}
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int main(void)
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{
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test_harness_set_timeout(300);
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return test_harness(test_signal, "signal");
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}
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