112 lines
4.1 KiB
C++
112 lines
4.1 KiB
C++
/*
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* Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2013 SAP SE. 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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*/
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#include "precompiled.hpp"
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#include "jvm.h"
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#include "runtime/interfaceSupport.hpp"
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#include "runtime/osThread.hpp"
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#include <signal.h>
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// sun.misc.Signal ///////////////////////////////////////////////////////////
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// Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
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/*
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* This function is included primarily as a debugging aid. If Java is
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* running in a console window, then pressing <CTRL-\\> will cause
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* the current state of all active threads and monitors to be written
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* to the console window.
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*/
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JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
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// Copied from classic vm
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// signals_md.c 1.4 98/08/23
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void* newHandler = handler == (void *)2
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? os::user_handler()
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: handler;
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switch (sig) {
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/* The following are already used by the VM. */
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case SIGFPE:
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case SIGILL:
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case SIGSEGV:
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/* The following signal is used by the VM to dump thread stacks unless
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ReduceSignalUsage is set, in which case the user is allowed to set
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his own _native_ handler for this signal; thus, in either case,
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we do not allow JVM_RegisterSignal to change the handler. */
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case BREAK_SIGNAL:
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return (void *)-1;
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/* The following signals are used for Shutdown Hooks support. However, if
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ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
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System.exit(), Java is not allowed to use these signals, and the the
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user is allowed to set his own _native_ handler for these signals and
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invoke System.exit() as needed. Terminator.setup() is avoiding
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registration of these signals when -Xrs is present.
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- If the HUP signal is ignored (from the nohup) command, then Java
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is not allowed to use this signal.
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*/
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case SHUTDOWN1_SIGNAL:
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case SHUTDOWN2_SIGNAL:
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case SHUTDOWN3_SIGNAL:
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if (ReduceSignalUsage) return (void*)-1;
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if (os::Aix::is_sig_ignored(sig)) return (void*)1;
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}
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void* oldHandler = os::signal(sig, newHandler);
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if (oldHandler == os::user_handler()) {
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return (void *)2;
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} else {
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return oldHandler;
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}
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JVM_END
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JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
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if (ReduceSignalUsage) {
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// do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
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// BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
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// no handler for them is actually registered in JVM or via
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// JVM_RegisterSignal.
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if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
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sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
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return JNI_FALSE;
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}
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}
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else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
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sig == SHUTDOWN3_SIGNAL) && os::Aix::is_sig_ignored(sig)) {
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// do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
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// is ignored, since no handler for them is actually registered in JVM
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// or via JVM_RegisterSignal.
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// This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
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return JNI_FALSE;
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}
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os::signal_raise(sig);
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return JNI_TRUE;
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JVM_END
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