1 /*

     2  * Copyright 1998-2007 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_jvm_windows.cpp.incl"

    27 

    28 #include <signal.h>

    29 

    30 JVM_LEAF(void*, JVM_GetThreadInterruptEvent())

    31   return Thread::current()->osthread()->interrupt_event();

    32 JVM_END

    33 

    34 // sun.misc.Signal ///////////////////////////////////////////////////////////

    35 // Signal code is mostly copied from classic vm, signals_md.c   1.4 98/08/23

    36 /*

    37  * This function is included primarily as a debugging aid. If Java is

    38  * running in a console window, then pressing <CTRL-BREAK> will cause

    39  * the current state of all active threads and monitors to be written

    40  * to the console window.

    41  */

    42 

    43 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))

    44   // Copied from classic vm

    45   // signals_md.c       1.4 98/08/23

    46   void* newHandler = handler == (void *)2

    47                    ? os::user_handler()

    48                    : handler;

    49   switch (sig) {

    50    case SIGFPE:

    51      return (void *)-1; /* already used by VM */

    52    case SIGBREAK:

    53      if (!ReduceSignalUsage) return (void *)-1;

    54 

    55     /* The following signals are used for Shutdown Hooks support. However, if

    56        ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via

    57        System.exit(), Java is not allowed to use these signals, and the the

    58        user is allowed to set his own _native_ handler for these signals and

    59        invoke System.exit() as needed. Terminator.setup() is avoiding

    60        registration of these signals when -Xrs is present. */

    61    case SHUTDOWN1_SIGNAL:

    62    case SHUTDOWN2_SIGNAL:

    63      if (ReduceSignalUsage) return (void*)-1;

    64   }

    65 

    66   void* oldHandler = os::signal(sig, newHandler);

    67   if (oldHandler == os::user_handler()) {

    68       return (void *)2;

    69   } else {

    70       return oldHandler;

    71   }

    72 JVM_END

    73 

    74 

    75 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))

    76   if (ReduceSignalUsage) {

    77     // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,BREAK_SIGNAL

    78     // to be raised when ReduceSignalUsage is set, since no handler

    79     // for them is actually registered in JVM or via JVM_RegisterSignal.

    80     if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||

    81         sig == SIGBREAK) {

    82       return JNI_FALSE;

    83     }

    84   }

    85   os::signal_raise(sig);

    86   return JNI_TRUE;

    87 JVM_END

    88 

    89 

    90 /*

    91   All the defined signal names for Windows.

    92 

    93   NOTE that not all of these names are accepted by FindSignal!

    94 

    95   For various reasons some of these may be rejected at runtime.

    96 

    97   Here are the names currently accepted by a user of sun.misc.Signal with

    98   1.4.1 (ignoring potential interaction with use of chaining, etc):

    99 

   100      (LIST TBD)

   101 

   102 */

   103 struct siglabel {

   104   char *name;

   105   int   number;

   106 };

   107 

   108 struct siglabel siglabels[] =

   109   /* derived from version 6.0 VC98/include/signal.h */

   110   {"ABRT",      SIGABRT,        /* abnormal termination triggered by abort cl */

   111   "FPE",        SIGFPE,         /* floating point exception */

   112   "SEGV",       SIGSEGV,        /* segment violation */

   113   "INT",        SIGINT,         /* interrupt */

   114   "TERM",       SIGTERM,        /* software term signal from kill */

   115   "BREAK",      SIGBREAK,       /* Ctrl-Break sequence */

   116   "ILL",        SIGILL};        /* illegal instruction */

   117 

   118 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))

   119   /* find and return the named signal's number */

   120 

   121   for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++)

   122     if(!strcmp(name, siglabels[i].name))

   123       return siglabels[i].number;

   124   return -1;

   125 JVM_END