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