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/*
* Copyright (c) 2022, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#ifndef _WIN32
#include "runtime/os.hpp"
#include "utilities/ostream.hpp"
#include "unittest.hpp"
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <sys/ucontext.h>
#include <string.h>
extern "C" {
static void sig_handler(int sig) {
printf( " HANDLER (1) " );
}
}
class PosixSignalTest : public ::testing::Test {
public:
static void check_handlers() {
struct sigaction act, old_SIGFPE_act, old_SIGILL_act;
act.sa_handler = sig_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
ASSERT_NE(sigaction(SIGFPE, &act, &old_SIGFPE_act), -1) << "Setting SIGFPE handler failed: " << os::strerror(errno) << " (" << errno << ")";
ASSERT_NE(sigaction(SIGILL, &act, &old_SIGILL_act), -1) << "Setting SIGILL handler failed: " << os::strerror(errno) << " (" << errno << ")";
// Use local stringStream to capture output from run_periodic_checks() calls to
// print_signal_handlers().
stringStream st;
os::run_periodic_checks(&st);
char* res = (char *)st.base(); // res can't be const because some strstr()'s have non-const first args.
// Restore signal handlers.
ASSERT_NE(sigaction(SIGFPE, &act, &old_SIGFPE_act), -1) << "Restoring SIGFPE handler failed: " << os::strerror(errno) << " (" << errno << ")";
ASSERT_NE(sigaction(SIGILL, &act, &old_SIGILL_act), -1) << "Restoring SIGILL handler failed: " << os::strerror(errno) << " (" << errno << ")";
// Check that "Handler was modified" occurs exactly twice in the tty output.
char* modified = strstr(res, "Handler was modified!");
ASSERT_NE(modified, nullptr) << "No message found";
modified = strstr(modified + 1, "Handler was modified!");
ASSERT_NE(modified, nullptr) << "Only one message found";
ASSERT_EQ(strstr(modified + 1, "Handler was modified!"), nullptr) << "Too many messages found";
}
};
// This tests the fix for JDK-8285792.
TEST_OTHER_VM(PosixSignalTest, check_handlers) {
PosixSignalTest::check_handlers();
}
#endif
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