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1 /*
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2 * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_jvm_windows.cpp.incl"
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27
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28 #include <signal.h>
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29
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30 JVM_LEAF(void*, JVM_GetThreadInterruptEvent())
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31 return Thread::current()->osthread()->interrupt_event();
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32 JVM_END
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33
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34 // sun.misc.Signal ///////////////////////////////////////////////////////////
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35 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
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36 /*
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37 * This function is included primarily as a debugging aid. If Java is
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38 * running in a console window, then pressing <CTRL-BREAK> will cause
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39 * the current state of all active threads and monitors to be written
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40 * to the console window.
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41 */
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42
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43 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
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44 // Copied from classic vm
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45 // signals_md.c 1.4 98/08/23
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46 void* newHandler = handler == (void *)2
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47 ? os::user_handler()
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48 : handler;
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49 switch (sig) {
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50 case SIGFPE:
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51 return (void *)-1; /* already used by VM */
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52 case SIGBREAK:
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53 if (!ReduceSignalUsage) return (void *)-1;
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54
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55 /* The following signals are used for Shutdown Hooks support. However, if
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56 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
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57 System.exit(), Java is not allowed to use these signals, and the the
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58 user is allowed to set his own _native_ handler for these signals and
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59 invoke System.exit() as needed. Terminator.setup() is avoiding
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60 registration of these signals when -Xrs is present. */
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61 case SHUTDOWN1_SIGNAL:
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62 case SHUTDOWN2_SIGNAL:
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63 if (ReduceSignalUsage) return (void*)-1;
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64 }
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65
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66 void* oldHandler = os::signal(sig, newHandler);
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67 if (oldHandler == os::user_handler()) {
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68 return (void *)2;
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69 } else {
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70 return oldHandler;
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71 }
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72 JVM_END
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73
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74
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75 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
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76 if (ReduceSignalUsage) {
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77 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,BREAK_SIGNAL
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78 // to be raised when ReduceSignalUsage is set, since no handler
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79 // for them is actually registered in JVM or via JVM_RegisterSignal.
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80 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
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81 sig == SIGBREAK) {
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82 return JNI_FALSE;
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83 }
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84 }
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85 os::signal_raise(sig);
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86 return JNI_TRUE;
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87 JVM_END
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88
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89
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90 /*
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91 All the defined signal names for Windows.
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92
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93 NOTE that not all of these names are accepted by FindSignal!
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94
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95 For various reasons some of these may be rejected at runtime.
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96
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97 Here are the names currently accepted by a user of sun.misc.Signal with
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98 1.4.1 (ignoring potential interaction with use of chaining, etc):
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99
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100 (LIST TBD)
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101
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102 */
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103 struct siglabel {
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104 char *name;
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105 int number;
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106 };
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107
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108 struct siglabel siglabels[] =
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109 /* derived from version 6.0 VC98/include/signal.h */
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110 {"ABRT", SIGABRT, /* abnormal termination triggered by abort cl */
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111 "FPE", SIGFPE, /* floating point exception */
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112 "SEGV", SIGSEGV, /* segment violation */
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113 "INT", SIGINT, /* interrupt */
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114 "TERM", SIGTERM, /* software term signal from kill */
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115 "BREAK", SIGBREAK, /* Ctrl-Break sequence */
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116 "ILL", SIGILL}; /* illegal instruction */
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117
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118 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
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119 /* find and return the named signal's number */
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120
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121 for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++)
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122 if(!strcmp(name, siglabels[i].name))
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123 return siglabels[i].number;
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124 return -1;
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125 JVM_END
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