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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_solaris.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 // sun.misc.Signal ///////////////////////////////////////////////////////////
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31 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
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32 /*
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33 * This function is included primarily as a debugging aid. If Java is
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34 * running in a console window, then pressing <CTRL-\\> will cause
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35 * the current state of all active threads and monitors to be written
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36 * to the console window.
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37 */
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38
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39 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
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40 // Copied from classic vm
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41 // signals_md.c 1.4 98/08/23
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42 void* newHandler = handler == (void *)2
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43 ? os::user_handler()
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44 : handler;
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45 switch (sig) {
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46 /* The following are already used by the VM. */
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47 case SIGFPE:
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48 case SIGILL:
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49 case SIGSEGV:
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50
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51 /* The following signal is used by the VM to dump thread stacks unless
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52 ReduceSignalUsage is set, in which case the user is allowed to set
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53 his own _native_ handler for this signal; thus, in either case,
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54 we do not allow JVM_RegisterSignal to change the handler. */
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55 case BREAK_SIGNAL:
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56 return (void *)-1;
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57
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58 /* The following signals are used for Shutdown Hooks support. However, if
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59 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
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60 System.exit(), Java is not allowed to use these signals, and the the
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61 user is allowed to set his own _native_ handler for these signals and
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62 invoke System.exit() as needed. Terminator.setup() is avoiding
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63 registration of these signals when -Xrs is present.
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64 - If the HUP signal is ignored (from the nohup) command, then Java
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65 is not allowed to use this signal.
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66 */
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67 case SHUTDOWN1_SIGNAL:
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68 case SHUTDOWN2_SIGNAL:
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69 case SHUTDOWN3_SIGNAL:
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70 if (ReduceSignalUsage) return (void*)-1;
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71 if (os::Solaris::is_sig_ignored(sig)) return (void*)1;
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72 }
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73
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74 /* Check parameterized signals. Don't allow sharing of our interrupt signal */
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75 if (sig == os::Solaris::SIGinterrupt()) {
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76 return (void *)-1;
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77 }
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78
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79 void* oldHandler = os::signal(sig, newHandler);
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80 if (oldHandler == os::user_handler()) {
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81 return (void *)2;
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82 } else {
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83 return oldHandler;
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84 }
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85 JVM_END
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86
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87
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88 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
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89 if (ReduceSignalUsage) {
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90 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
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91 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
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92 // no handler for them is actually registered in JVM or via
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93 // JVM_RegisterSignal.
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94 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
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95 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
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96 return JNI_FALSE;
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97 }
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98 }
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99 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
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100 sig == SHUTDOWN3_SIGNAL) && os::Solaris::is_sig_ignored(sig)) {
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101 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
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102 // is ignored, since no handler for them is actually registered in JVM
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103 // or via JVM_RegisterSignal.
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104 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
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105 return JNI_FALSE;
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106 }
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107
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108 os::signal_raise(sig);
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109 return JNI_TRUE;
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110 JVM_END
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111
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112
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113 /*
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114 All the defined signal names for Solaris are defined by str2sig().
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115
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116 NOTE that not all of these names are accepted by our Java implementation
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117
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118 Via an existing claim by the VM, sigaction restrictions, or
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119 the "rules of Unix" some of these names will be rejected at runtime.
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120 For example the VM sets up to handle USR1, sigaction returns EINVAL for
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121 CANCEL, and Solaris simply doesn't allow catching of KILL.
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122
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123 Here are the names currently accepted by a user of sun.misc.Signal with
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124 1.4.1 (ignoring potential interaction with use of chaining, etc):
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125
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126 HUP, INT, TRAP, IOT, ABRT, EMT, BUS, SYS, PIPE, ALRM, TERM, USR2,
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127 CLD, CHLD, PWR, WINCH, URG, POLL, IO, TSTP, CONT, TTIN, TTOU, VTALRM,
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128 PROF, XCPU, XFSZ, FREEZE, THAW, LOST
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129 */
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130
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131 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
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132
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133 int sig;
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134
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135 /* return the named signal's number */
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136
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137 if(str2sig(name, &sig))
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138 return -1;
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139 else
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140 return sig;
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141
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142 JVM_END
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143
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144
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145 //Reconciliation History
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146 // 1.4 98/10/07 13:39:41 jvm_win32.cpp
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147 // 1.6 99/06/22 16:39:00 jvm_win32.cpp
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148 //End
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