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