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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
// 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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