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