|
3960
|
1 /*
|
|
|
2 * Copyright (c) 1999, 2011, 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
|
|
|
33 // sun.misc.Signal ///////////////////////////////////////////////////////////
|
|
|
34 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
|
|
|
35 /*
|
|
|
36 * This function is included primarily as a debugging aid. If Java is
|
|
|
37 * running in a console window, then pressing <CTRL-\\> will cause
|
|
|
38 * the current state of all active threads and monitors to be written
|
|
|
39 * to the console window.
|
|
|
40 */
|
|
|
41
|
|
|
42 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
|
|
|
43 // Copied from classic vm
|
|
|
44 // signals_md.c 1.4 98/08/23
|
|
|
45 void* newHandler = handler == (void *)2
|
|
|
46 ? os::user_handler()
|
|
|
47 : handler;
|
|
|
48 switch (sig) {
|
|
|
49 /* The following are already used by the VM. */
|
|
|
50 case INTERRUPT_SIGNAL:
|
|
|
51 case SIGFPE:
|
|
|
52 case SIGILL:
|
|
|
53 case SIGSEGV:
|
|
|
54
|
|
|
55 /* The following signal is used by the VM to dump thread stacks unless
|
|
|
56 ReduceSignalUsage is set, in which case the user is allowed to set
|
|
|
57 his own _native_ handler for this signal; thus, in either case,
|
|
|
58 we do not allow JVM_RegisterSignal to change the handler. */
|
|
|
59 case BREAK_SIGNAL:
|
|
|
60 return (void *)-1;
|
|
|
61
|
|
|
62 /* The following signals are used for Shutdown Hooks support. However, if
|
|
|
63 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
|
|
|
64 System.exit(), Java is not allowed to use these signals, and the the
|
|
|
65 user is allowed to set his own _native_ handler for these signals and
|
|
|
66 invoke System.exit() as needed. Terminator.setup() is avoiding
|
|
|
67 registration of these signals when -Xrs is present.
|
|
|
68 - If the HUP signal is ignored (from the nohup) command, then Java
|
|
|
69 is not allowed to use this signal.
|
|
|
70 */
|
|
|
71
|
|
|
72 case SHUTDOWN1_SIGNAL:
|
|
|
73 case SHUTDOWN2_SIGNAL:
|
|
|
74 case SHUTDOWN3_SIGNAL:
|
|
|
75 if (ReduceSignalUsage) return (void*)-1;
|
|
|
76 if (os::Bsd::is_sig_ignored(sig)) return (void*)1;
|
|
|
77 }
|
|
|
78
|
|
|
79 void* oldHandler = os::signal(sig, newHandler);
|
|
|
80 if (oldHandler == os::user_handler()) {
|
|
|
81 return (void *)2;
|
|
|
82 } else {
|
|
|
83 return oldHandler;
|
|
|
84 }
|
|
|
85 JVM_END
|
|
|
86
|
|
|
87
|
|
|
88 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
|
|
|
89 if (ReduceSignalUsage) {
|
|
|
90 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
|
|
|
91 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
|
|
|
92 // no handler for them is actually registered in JVM or via
|
|
|
93 // JVM_RegisterSignal.
|
|
|
94 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
|
|
|
95 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
|
|
|
96 return JNI_FALSE;
|
|
|
97 }
|
|
|
98 }
|
|
|
99 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
|
|
|
100 sig == SHUTDOWN3_SIGNAL) && os::Bsd::is_sig_ignored(sig)) {
|
|
|
101 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
|
|
|
102 // is ignored, since no handler for them is actually registered in JVM
|
|
|
103 // or via JVM_RegisterSignal.
|
|
|
104 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
|
|
|
105 return JNI_FALSE;
|
|
|
106 }
|
|
|
107
|
|
|
108 os::signal_raise(sig);
|
|
|
109 return JNI_TRUE;
|
|
|
110 JVM_END
|
|
|
111
|
|
|
112 /*
|
|
|
113 All the defined signal names for Bsd.
|
|
|
114
|
|
|
115 NOTE that not all of these names are accepted by our Java implementation
|
|
|
116
|
|
|
117 Via an existing claim by the VM, sigaction restrictions, or
|
|
|
118 the "rules of Unix" some of these names will be rejected at runtime.
|
|
|
119 For example the VM sets up to handle USR1, sigaction returns EINVAL for
|
|
|
120 STOP, and Bsd simply doesn't allow catching of KILL.
|
|
|
121
|
|
|
122 Here are the names currently accepted by a user of sun.misc.Signal with
|
|
|
123 1.4.1 (ignoring potential interaction with use of chaining, etc):
|
|
|
124
|
|
|
125 HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
|
|
|
126 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
|
|
|
127 WINCH, POLL, IO, PWR, SYS
|
|
|
128
|
|
|
129 */
|
|
|
130
|
|
|
131 struct siglabel {
|
|
|
132 const char *name;
|
|
|
133 int number;
|
|
|
134 };
|
|
|
135
|
|
|
136 struct siglabel siglabels[] = {
|
|
|
137 /* derived from /usr/include/bits/signum.h on RH7.2 */
|
|
|
138 "HUP", SIGHUP, /* Hangup (POSIX). */
|
|
|
139 "INT", SIGINT, /* Interrupt (ANSI). */
|
|
|
140 "QUIT", SIGQUIT, /* Quit (POSIX). */
|
|
|
141 "ILL", SIGILL, /* Illegal instruction (ANSI). */
|
|
|
142 "TRAP", SIGTRAP, /* Trace trap (POSIX). */
|
|
|
143 "ABRT", SIGABRT, /* Abort (ANSI). */
|
|
|
144 "EMT", SIGEMT, /* EMT trap */
|
|
|
145 "FPE", SIGFPE, /* Floating-point exception (ANSI). */
|
|
|
146 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
|
|
|
147 "BUS", SIGBUS, /* BUS error (4.2 BSD). */
|
|
|
148 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
|
|
|
149 "SYS", SIGSYS, /* Bad system call. Only on some Bsden! */
|
|
|
150 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
|
|
|
151 "ALRM", SIGALRM, /* Alarm clock (POSIX). */
|
|
|
152 "TERM", SIGTERM, /* Termination (ANSI). */
|
|
|
153 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
|
|
|
154 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
|
|
|
155 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
|
|
|
156 "CONT", SIGCONT, /* Continue (POSIX). */
|
|
|
157 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
|
|
|
158 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
|
|
|
159 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
|
|
|
160 "IO", SIGIO, /* I/O now possible (4.2 BSD). */
|
|
|
161 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
|
|
|
162 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
|
|
|
163 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
|
|
|
164 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
|
|
|
165 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
|
|
|
166 "INFO", SIGINFO, /* Information request. */
|
|
|
167 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
|
|
|
168 "USR2", SIGUSR2 /* User-defined signal 2 (POSIX). */
|
|
|
169 };
|
|
|
170
|
|
|
171 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
|
|
|
172
|
|
|
173 /* find and return the named signal's number */
|
|
|
174
|
|
|
175 for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
|
|
|
176 if(!strcmp(name, siglabels[i].name))
|
|
|
177 return siglabels[i].number;
|
|
|
178
|
|
|
179 return -1;
|
|
|
180
|
|
|
181 JVM_END
|
|
|
182
|
|
|
183 // used by os::exception_name()
|
|
|
184 extern bool signal_name(int signo, char* buf, size_t len) {
|
|
|
185 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
|
|
|
186 if (signo == siglabels[i].number) {
|
|
|
187 jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
|
|
|
188 return true;
|
|
|
189 }
|
|
|
190 }
|
|
|
191 return false;
|
|
|
192 }
|
