1 /* 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "prims/jvm.h" 27 #include "runtime/interfaceSupport.hpp" 28 #include "runtime/osThread.hpp" 29 30 #include <signal.h> 31 32 JVM_LEAF(void*, JVM_GetThreadInterruptEvent()) 33 return Thread::current()->osthread()->interrupt_event(); 34 JVM_END 35 36 // sun.misc.Signal /////////////////////////////////////////////////////////// 37 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23 38 /* 39 * This function is included primarily as a debugging aid. If Java is 40 * running in a console window, then pressing <CTRL-BREAK> will cause 41 * the current state of all active threads and monitors to be written 42 * to the console window. 43 */ 44 45 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler)) 46 // Copied from classic vm 47 // signals_md.c 1.4 98/08/23 48 void* newHandler = handler == (void *)2 49 ? os::user_handler() 50 : handler; 51 switch (sig) { 52 case SIGFPE: 53 return (void *)-1; /* already used by VM */ 54 case SIGBREAK: 55 if (!ReduceSignalUsage) return (void *)-1; 56 57 /* The following signals are used for Shutdown Hooks support. However, if 58 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via 59 System.exit(), Java is not allowed to use these signals, and the the 60 user is allowed to set his own _native_ handler for these signals and 61 invoke System.exit() as needed. Terminator.setup() is avoiding 62 registration of these signals when -Xrs is present. */ 63 case SHUTDOWN1_SIGNAL: 64 case SHUTDOWN2_SIGNAL: 65 if (ReduceSignalUsage) return (void*)-1; 66 } 67 68 void* oldHandler = os::signal(sig, newHandler); 69 if (oldHandler == os::user_handler()) { 70 return (void *)2; 71 } else { 72 return oldHandler; 73 } 74 JVM_END 75 76 77 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig)) 78 if (ReduceSignalUsage) { 79 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,BREAK_SIGNAL 80 // to be raised when ReduceSignalUsage is set, since no handler 81 // for them is actually registered in JVM or via JVM_RegisterSignal. 82 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL || 83 sig == SIGBREAK) { 84 return JNI_FALSE; 85 } 86 } 87 os::signal_raise(sig); 88 return JNI_TRUE; 89 JVM_END 90 91 92 /* 93 All the defined signal names for Windows. 94 95 NOTE that not all of these names are accepted by FindSignal! 96 97 For various reasons some of these may be rejected at runtime. 98 99 Here are the names currently accepted by a user of sun.misc.Signal with 100 1.4.1 (ignoring potential interaction with use of chaining, etc): 101 102 (LIST TBD) 103 104 */ 105 struct siglabel { 106 char *name; 107 int number; 108 }; 109 110 struct siglabel siglabels[] = 111 /* derived from version 6.0 VC98/include/signal.h */ 112 {"ABRT", SIGABRT, /* abnormal termination triggered by abort cl */ 113 "FPE", SIGFPE, /* floating point exception */ 114 "SEGV", SIGSEGV, /* segment violation */ 115 "INT", SIGINT, /* interrupt */ 116 "TERM", SIGTERM, /* software term signal from kill */ 117 "BREAK", SIGBREAK, /* Ctrl-Break sequence */ 118 "ILL", SIGILL}; /* illegal instruction */ 119 120 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) 121 /* find and return the named signal's number */ 122 123 for(int i=0;i<sizeof(siglabels)/sizeof(struct siglabel);i++) 124 if(!strcmp(name, siglabels[i].name)) 125 return siglabels[i].number; 126 return -1; 127 JVM_END