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1 /* |
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2 * Copyright 1999-2007 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_linux.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 /* |
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31 * FIXME: This is temporary hack to keep Linux Runtime.exec() |
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32 * code happy. See $JDK/src/linux/native/java/lang/UnixProcess_md.c |
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33 */ |
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34 int _JVM_native_threads = 1; |
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35 |
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36 // sun.misc.Signal /////////////////////////////////////////////////////////// |
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37 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23 |
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38 /* |
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39 * This function is included primarily as a debugging aid. If Java is |
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40 * running in a console window, then pressing <CTRL-\\> will cause |
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41 * the current state of all active threads and monitors to be written |
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42 * to the console window. |
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43 */ |
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44 |
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45 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler)) |
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46 // Copied from classic vm |
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47 // signals_md.c 1.4 98/08/23 |
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48 void* newHandler = handler == (void *)2 |
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49 ? os::user_handler() |
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50 : handler; |
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51 switch (sig) { |
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52 /* The following are already used by the VM. */ |
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53 case INTERRUPT_SIGNAL: |
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54 case SIGFPE: |
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55 case SIGILL: |
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56 case SIGSEGV: |
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57 |
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58 /* The following signal is used by the VM to dump thread stacks unless |
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59 ReduceSignalUsage is set, in which case the user is allowed to set |
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60 his own _native_ handler for this signal; thus, in either case, |
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61 we do not allow JVM_RegisterSignal to change the handler. */ |
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62 case BREAK_SIGNAL: |
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63 return (void *)-1; |
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64 |
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65 /* The following signals are used for Shutdown Hooks support. However, if |
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66 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via |
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67 System.exit(), Java is not allowed to use these signals, and the the |
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68 user is allowed to set his own _native_ handler for these signals and |
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69 invoke System.exit() as needed. Terminator.setup() is avoiding |
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70 registration of these signals when -Xrs is present. |
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71 - If the HUP signal is ignored (from the nohup) command, then Java |
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72 is not allowed to use this signal. |
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73 */ |
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74 |
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75 case SHUTDOWN1_SIGNAL: |
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76 case SHUTDOWN2_SIGNAL: |
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77 case SHUTDOWN3_SIGNAL: |
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78 if (ReduceSignalUsage) return (void*)-1; |
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79 if (os::Linux::is_sig_ignored(sig)) return (void*)1; |
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80 } |
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81 |
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82 void* oldHandler = os::signal(sig, newHandler); |
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83 if (oldHandler == os::user_handler()) { |
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84 return (void *)2; |
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85 } else { |
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86 return oldHandler; |
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87 } |
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88 JVM_END |
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89 |
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90 |
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91 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig)) |
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92 if (ReduceSignalUsage) { |
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93 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL, |
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94 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since |
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95 // no handler for them is actually registered in JVM or via |
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96 // JVM_RegisterSignal. |
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97 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL || |
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98 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) { |
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99 return JNI_FALSE; |
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100 } |
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101 } |
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102 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL || |
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103 sig == SHUTDOWN3_SIGNAL) && os::Linux::is_sig_ignored(sig)) { |
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104 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL |
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105 // is ignored, since no handler for them is actually registered in JVM |
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106 // or via JVM_RegisterSignal. |
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107 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL |
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108 return JNI_FALSE; |
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109 } |
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110 |
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111 os::signal_raise(sig); |
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112 return JNI_TRUE; |
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113 JVM_END |
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114 |
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115 /* |
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116 All the defined signal names for Linux. |
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117 |
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118 NOTE that not all of these names are accepted by our Java implementation |
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119 |
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120 Via an existing claim by the VM, sigaction restrictions, or |
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121 the "rules of Unix" some of these names will be rejected at runtime. |
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122 For example the VM sets up to handle USR1, sigaction returns EINVAL for |
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123 STOP, and Linux simply doesn't allow catching of KILL. |
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124 |
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125 Here are the names currently accepted by a user of sun.misc.Signal with |
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126 1.4.1 (ignoring potential interaction with use of chaining, etc): |
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127 |
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128 HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT, |
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129 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF, |
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130 WINCH, POLL, IO, PWR, SYS |
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131 |
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132 */ |
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133 |
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134 struct siglabel { |
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135 char *name; |
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136 int number; |
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137 }; |
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138 |
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139 struct siglabel siglabels[] = { |
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140 /* derived from /usr/include/bits/signum.h on RH7.2 */ |
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141 "HUP", SIGHUP, /* Hangup (POSIX). */ |
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142 "INT", SIGINT, /* Interrupt (ANSI). */ |
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143 "QUIT", SIGQUIT, /* Quit (POSIX). */ |
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144 "ILL", SIGILL, /* Illegal instruction (ANSI). */ |
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145 "TRAP", SIGTRAP, /* Trace trap (POSIX). */ |
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146 "ABRT", SIGABRT, /* Abort (ANSI). */ |
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147 "IOT", SIGIOT, /* IOT trap (4.2 BSD). */ |
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148 "BUS", SIGBUS, /* BUS error (4.2 BSD). */ |
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149 "FPE", SIGFPE, /* Floating-point exception (ANSI). */ |
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150 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */ |
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151 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */ |
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152 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */ |
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153 "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */ |
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154 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */ |
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155 "ALRM", SIGALRM, /* Alarm clock (POSIX). */ |
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156 "TERM", SIGTERM, /* Termination (ANSI). */ |
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157 #ifdef SIGSTKFLT |
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158 "STKFLT", SIGSTKFLT, /* Stack fault. */ |
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159 #endif |
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160 "CLD", SIGCLD, /* Same as SIGCHLD (System V). */ |
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161 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */ |
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162 "CONT", SIGCONT, /* Continue (POSIX). */ |
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163 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */ |
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164 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */ |
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165 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */ |
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166 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */ |
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167 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */ |
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168 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */ |
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169 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */ |
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170 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */ |
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171 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */ |
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172 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */ |
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173 "POLL", SIGPOLL, /* Pollable event occurred (System V). */ |
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174 "IO", SIGIO, /* I/O now possible (4.2 BSD). */ |
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175 "PWR", SIGPWR, /* Power failure restart (System V). */ |
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176 #ifdef SIGSYS |
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177 "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */ |
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178 #endif |
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179 }; |
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180 |
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181 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) |
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182 |
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183 /* find and return the named signal's number */ |
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184 |
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185 for(uint i=0; i<ARRAY_SIZE(siglabels); i++) |
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186 if(!strcmp(name, siglabels[i].name)) |
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187 return siglabels[i].number; |
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188 |
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189 return -1; |
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190 |
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191 JVM_END |
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192 |
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193 // used by os::exception_name() |
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194 extern bool signal_name(int signo, char* buf, size_t len) { |
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195 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) { |
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196 if (signo == siglabels[i].number) { |
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197 jio_snprintf(buf, len, "SIG%s", siglabels[i].name); |
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198 return true; |
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199 } |
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200 } |
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201 return false; |
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202 } |