duke@435: /*
stefank@2314:  * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "prims/jvm.h"
stefank@2314: #include "runtime/interfaceSupport.hpp"
stefank@2314: #include "runtime/osThread.hpp"
duke@435: 
duke@435: #include <signal.h>
duke@435: 
duke@435: JVM_LEAF(void*, JVM_GetThreadInterruptEvent())
duke@435:   return Thread::current()->osthread()->interrupt_event();
duke@435: JVM_END
duke@435: 
duke@435: // sun.misc.Signal ///////////////////////////////////////////////////////////
duke@435: // Signal code is mostly copied from classic vm, signals_md.c   1.4 98/08/23
duke@435: /*
duke@435:  * This function is included primarily as a debugging aid. If Java is
duke@435:  * running in a console window, then pressing <CTRL-BREAK> will cause
duke@435:  * the current state of all active threads and monitors to be written
duke@435:  * to the console window.
duke@435:  */
duke@435: 
duke@435: JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
duke@435:   // Copied from classic vm
duke@435:   // signals_md.c       1.4 98/08/23
duke@435:   void* newHandler = handler == (void *)2
duke@435:                    ? os::user_handler()
duke@435:                    : handler;
duke@435:   switch (sig) {
duke@435:    case SIGFPE:
duke@435:      return (void *)-1; /* already used by VM */
duke@435:    case SIGBREAK:
duke@435:      if (!ReduceSignalUsage) return (void *)-1;
duke@435: 
duke@435:     /* The following signals are used for Shutdown Hooks support. However, if
duke@435:        ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
duke@435:        System.exit(), Java is not allowed to use these signals, and the the
duke@435:        user is allowed to set his own _native_ handler for these signals and
duke@435:        invoke System.exit() as needed. Terminator.setup() is avoiding
duke@435:        registration of these signals when -Xrs is present. */
duke@435:    case SHUTDOWN1_SIGNAL:
duke@435:    case SHUTDOWN2_SIGNAL:
duke@435:      if (ReduceSignalUsage) return (void*)-1;
duke@435:   }
duke@435: 
duke@435:   void* oldHandler = os::signal(sig, newHandler);
duke@435:   if (oldHandler == os::user_handler()) {
duke@435:       return (void *)2;
duke@435:   } else {
duke@435:       return oldHandler;
duke@435:   }
duke@435: JVM_END
duke@435: 
duke@435: 
duke@435: JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
duke@435:   if (ReduceSignalUsage) {
duke@435:     // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,BREAK_SIGNAL
duke@435:     // to be raised when ReduceSignalUsage is set, since no handler
duke@435:     // for them is actually registered in JVM or via JVM_RegisterSignal.
duke@435:     if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
duke@435:         sig == SIGBREAK) {
duke@435:       return JNI_FALSE;
duke@435:     }
duke@435:   }
duke@435:   os::signal_raise(sig);
duke@435:   return JNI_TRUE;
duke@435: JVM_END
duke@435: 
duke@435: 
duke@435: /*
duke@435:   All the defined signal names for Windows.
duke@435: 
duke@435:   NOTE that not all of these names are accepted by FindSignal!
duke@435: 
duke@435:   For various reasons some of these may be rejected at runtime.
duke@435: 
duke@435:   Here are the names currently accepted by a user of sun.misc.Signal with
duke@435:   1.4.1 (ignoring potential interaction with use of chaining, etc):
duke@435: 
duke@435:      (LIST TBD)
duke@435: 
duke@435: */
duke@435: struct siglabel {
duke@435:   char *name;
duke@435:   int   number;
duke@435: };
duke@435: 
duke@435: struct siglabel siglabels[] =
duke@435:   /* derived from version 6.0 VC98/include/signal.h */
duke@435:   {"ABRT",      SIGABRT,        /* abnormal termination triggered by abort cl */
duke@435:   "FPE",        SIGFPE,         /* floating point exception */
duke@435:   "SEGV",       SIGSEGV,        /* segment violation */
duke@435:   "INT",        SIGINT,         /* interrupt */
duke@435:   "TERM",       SIGTERM,        /* software term signal from kill */
duke@435:   "BREAK",      SIGBREAK,       /* Ctrl-Break sequence */
duke@435:   "ILL",        SIGILL};        /* illegal instruction */
duke@435: 
duke@435: JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
duke@435:   /* find and return the named signal's number */
duke@435: 
duke@435:   for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++)
duke@435:     if(!strcmp(name, siglabels[i].name))
duke@435:       return siglabels[i].number;
duke@435:   return -1;
duke@435: JVM_END