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}