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annotate src/os/aix/vm/jvm_aix.cpp @ 18408:2c3666f44855

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Truffle: initial commit of object API implementation
author Andreas Woess <andreas.woess@jku.at>
date Tue, 18 Nov 2014 23:19:43 +0100
parents 666e6ce3976c
children
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14415
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1 /*
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2012, 2013 SAP AG. All rights reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #include "precompiled.hpp"
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27 #include "prims/jvm.h"
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28 #include "runtime/interfaceSupport.hpp"
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29 #include "runtime/osThread.hpp"
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30
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31 #include <signal.h>
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32
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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-\\> 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 /* The following are already used by the VM. */
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51 case INTERRUPT_SIGNAL:
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52 case SIGFPE:
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53 case SIGILL:
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54 case SIGSEGV:
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55
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56 /* The following signal is used by the VM to dump thread stacks unless
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57 ReduceSignalUsage is set, in which case the user is allowed to set
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58 his own _native_ handler for this signal; thus, in either case,
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59 we do not allow JVM_RegisterSignal to change the handler. */
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60 case BREAK_SIGNAL:
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61 return (void *)-1;
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62
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63 /* The following signals are used for Shutdown Hooks support. However, if
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64 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
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65 System.exit(), Java is not allowed to use these signals, and the the
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66 user is allowed to set his own _native_ handler for these signals and
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67 invoke System.exit() as needed. Terminator.setup() is avoiding
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68 registration of these signals when -Xrs is present.
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69 - If the HUP signal is ignored (from the nohup) command, then Java
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70 is not allowed to use this signal.
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71 */
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72
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73 case SHUTDOWN1_SIGNAL:
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74 case SHUTDOWN2_SIGNAL:
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75 case SHUTDOWN3_SIGNAL:
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76 if (ReduceSignalUsage) return (void*)-1;
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77 if (os::Aix::is_sig_ignored(sig)) return (void*)1;
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78 }
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79
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80 void* oldHandler = os::signal(sig, newHandler);
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81 if (oldHandler == os::user_handler()) {
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82 return (void *)2;
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83 } else {
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84 return oldHandler;
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85 }
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86 JVM_END
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87
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88
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89 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
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90 if (ReduceSignalUsage) {
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91 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
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92 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
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93 // no handler for them is actually registered in JVM or via
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94 // JVM_RegisterSignal.
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95 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
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96 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
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97 return JNI_FALSE;
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98 }
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99 }
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100 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
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101 sig == SHUTDOWN3_SIGNAL) && os::Aix::is_sig_ignored(sig)) {
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102 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
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103 // is ignored, since no handler for them is actually registered in JVM
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104 // or via JVM_RegisterSignal.
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105 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
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106 return JNI_FALSE;
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107 }
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108
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109 os::signal_raise(sig);
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110 return JNI_TRUE;
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111 JVM_END
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112
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113 /*
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114 All the defined signal names for Linux.
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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 STOP, and Linux 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, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
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127 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
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128 WINCH, POLL, IO, PWR, SYS
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129
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130 */
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131
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132 struct siglabel {
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133 const char *name;
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134 int number;
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135 };
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136
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137 struct siglabel siglabels[] = {
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138 /* derived from /usr/include/bits/signum.h on RH7.2 */
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139 "HUP", SIGHUP, /* Hangup (POSIX). */
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140 "INT", SIGINT, /* Interrupt (ANSI). */
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141 "QUIT", SIGQUIT, /* Quit (POSIX). */
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142 "ILL", SIGILL, /* Illegal instruction (ANSI). */
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143 "TRAP", SIGTRAP, /* Trace trap (POSIX). */
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144 "ABRT", SIGABRT, /* Abort (ANSI). */
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145 "IOT", SIGIOT, /* IOT trap (4.2 BSD). */
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146 "BUS", SIGBUS, /* BUS error (4.2 BSD). */
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147 "FPE", SIGFPE, /* Floating-point exception (ANSI). */
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148 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
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149 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
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150 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
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151 "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */
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152 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
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153 "ALRM", SIGALRM, /* Alarm clock (POSIX). */
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154 "TERM", SIGTERM, /* Termination (ANSI). */
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155 #ifdef SIGSTKFLT
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156 "STKFLT", SIGSTKFLT, /* Stack fault. */
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157 #endif
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158 "CLD", SIGCLD, /* Same as SIGCHLD (System V). */
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159 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
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160 "CONT", SIGCONT, /* Continue (POSIX). */
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161 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
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162 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
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163 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
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164 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
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165 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
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166 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
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167 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
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168 "DANGER", SIGDANGER, /* System crash imminent; free up some page space (AIX). */
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169 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
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170 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
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171 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
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172 "POLL", SIGPOLL, /* Pollable event occurred (System V). */
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173 "IO", SIGIO, /* I/O now possible (4.2 BSD). */
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174 "PWR", SIGPWR, /* Power failure restart (System V). */
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175 #ifdef SIGSYS
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176 "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */
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177 #endif
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178 };
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179
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180 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
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181
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182 /* find and return the named signal's number */
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183
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184 for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
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185 if(!strcmp(name, siglabels[i].name))
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186 return siglabels[i].number;
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187
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188 return -1;
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189
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190 JVM_END
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191
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192 // used by os::exception_name()
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193 extern bool signal_name(int signo, char* buf, size_t len) {
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194 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
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195 if (signo == siglabels[i].number) {
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196 jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
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197 return true;
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198 }
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199 }
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200 return false;
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201 }