3960
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1 /*
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2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "prims/jvm.h"
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27 #include "runtime/interfaceSupport.hpp"
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28 #include "runtime/osThread.hpp"
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29
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30 #include <signal.h>
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31
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32
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33 // sun.misc.Signal ///////////////////////////////////////////////////////////
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34 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
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35 /*
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36 * This function is included primarily as a debugging aid. If Java is
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37 * running in a console window, then pressing <CTRL-\\> will cause
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38 * the current state of all active threads and monitors to be written
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39 * to the console window.
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40 */
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41
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42 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
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43 // Copied from classic vm
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44 // signals_md.c 1.4 98/08/23
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45 void* newHandler = handler == (void *)2
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46 ? os::user_handler()
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47 : handler;
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48 switch (sig) {
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49 /* The following are already used by the VM. */
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50 case INTERRUPT_SIGNAL:
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51 case SIGFPE:
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52 case SIGILL:
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53 case SIGSEGV:
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54
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55 /* The following signal is used by the VM to dump thread stacks unless
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56 ReduceSignalUsage is set, in which case the user is allowed to set
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57 his own _native_ handler for this signal; thus, in either case,
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58 we do not allow JVM_RegisterSignal to change the handler. */
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59 case BREAK_SIGNAL:
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60 return (void *)-1;
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61
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62 /* The following signals are used for Shutdown Hooks support. However, if
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63 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
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64 System.exit(), Java is not allowed to use these signals, and the the
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65 user is allowed to set his own _native_ handler for these signals and
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66 invoke System.exit() as needed. Terminator.setup() is avoiding
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67 registration of these signals when -Xrs is present.
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68 - If the HUP signal is ignored (from the nohup) command, then Java
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69 is not allowed to use this signal.
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70 */
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71
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72 case SHUTDOWN1_SIGNAL:
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73 case SHUTDOWN2_SIGNAL:
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74 case SHUTDOWN3_SIGNAL:
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75 if (ReduceSignalUsage) return (void*)-1;
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76 if (os::Bsd::is_sig_ignored(sig)) 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::Bsd::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 All the defined signal names for Bsd.
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114
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115 NOTE that not all of these names are accepted by our Java implementation
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116
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117 Via an existing claim by the VM, sigaction restrictions, or
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118 the "rules of Unix" some of these names will be rejected at runtime.
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119 For example the VM sets up to handle USR1, sigaction returns EINVAL for
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120 STOP, and Bsd simply doesn't allow catching of KILL.
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121
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122 Here are the names currently accepted by a user of sun.misc.Signal with
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123 1.4.1 (ignoring potential interaction with use of chaining, etc):
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124
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125 HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
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126 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
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127 WINCH, POLL, IO, PWR, SYS
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128
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129 */
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130
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131 struct siglabel {
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132 const char *name;
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133 int number;
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134 };
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135
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136 struct siglabel siglabels[] = {
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137 /* derived from /usr/include/bits/signum.h on RH7.2 */
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138 "HUP", SIGHUP, /* Hangup (POSIX). */
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139 "INT", SIGINT, /* Interrupt (ANSI). */
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140 "QUIT", SIGQUIT, /* Quit (POSIX). */
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141 "ILL", SIGILL, /* Illegal instruction (ANSI). */
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142 "TRAP", SIGTRAP, /* Trace trap (POSIX). */
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143 "ABRT", SIGABRT, /* Abort (ANSI). */
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144 "EMT", SIGEMT, /* EMT trap */
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145 "FPE", SIGFPE, /* Floating-point exception (ANSI). */
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146 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
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147 "BUS", SIGBUS, /* BUS error (4.2 BSD). */
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148 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
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149 "SYS", SIGSYS, /* Bad system call. Only on some Bsden! */
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150 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
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151 "ALRM", SIGALRM, /* Alarm clock (POSIX). */
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152 "TERM", SIGTERM, /* Termination (ANSI). */
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153 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
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154 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
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155 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
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156 "CONT", SIGCONT, /* Continue (POSIX). */
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157 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
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158 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
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159 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
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160 "IO", SIGIO, /* I/O now possible (4.2 BSD). */
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161 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
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162 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
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163 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
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164 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
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165 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
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166 "INFO", SIGINFO, /* Information request. */
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167 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
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168 "USR2", SIGUSR2 /* User-defined signal 2 (POSIX). */
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169 };
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170
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171 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
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172
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173 /* find and return the named signal's number */
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174
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175 for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
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176 if(!strcmp(name, siglabels[i].name))
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177 return siglabels[i].number;
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178
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179 return -1;
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180
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181 JVM_END
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182
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183 // used by os::exception_name()
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184 extern bool signal_name(int signo, char* buf, size_t len) {
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185 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
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186 if (signo == siglabels[i].number) {
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187 jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
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188 return true;
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189 }
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190 }
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191 return false;
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192 }
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