jdk

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