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comparison: src/os/aix/vm/jvm_aix.cpp

src/os/aix/vm/jvm_aix.cpp

changeset 6465
666e6ce3976c
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6464:b83f7d608548 6465:666e6ce3976c
1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2013 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "prims/jvm.h"
28 #include "runtime/interfaceSupport.hpp"
29 #include "runtime/osThread.hpp"
30
31 #include <signal.h>
32
33
34 // sun.misc.Signal ///////////////////////////////////////////////////////////
35 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
36 /*
37 * This function is included primarily as a debugging aid. If Java is
38 * running in a console window, then pressing <CTRL-\\> will cause
39 * the current state of all active threads and monitors to be written
40 * to the console window.
41 */
42
43 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
44 // Copied from classic vm
45 // signals_md.c 1.4 98/08/23
46 void* newHandler = handler == (void *)2
47 ? os::user_handler()
48 : handler;
49 switch (sig) {
50 /* The following are already used by the VM. */
51 case INTERRUPT_SIGNAL:
52 case SIGFPE:
53 case SIGILL:
54 case SIGSEGV:
55
56 /* The following signal is used by the VM to dump thread stacks unless
57 ReduceSignalUsage is set, in which case the user is allowed to set
58 his own _native_ handler for this signal; thus, in either case,
59 we do not allow JVM_RegisterSignal to change the handler. */
60 case BREAK_SIGNAL:
61 return (void *)-1;
62
63 /* The following signals are used for Shutdown Hooks support. However, if
64 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
65 System.exit(), Java is not allowed to use these signals, and the the
66 user is allowed to set his own _native_ handler for these signals and
67 invoke System.exit() as needed. Terminator.setup() is avoiding
68 registration of these signals when -Xrs is present.
69 - If the HUP signal is ignored (from the nohup) command, then Java
70 is not allowed to use this signal.
71 */
72
73 case SHUTDOWN1_SIGNAL:
74 case SHUTDOWN2_SIGNAL:
75 case SHUTDOWN3_SIGNAL:
76 if (ReduceSignalUsage) return (void*)-1;
77 if (os::Aix::is_sig_ignored(sig)) return (void*)1;
78 }
79
80 void* oldHandler = os::signal(sig, newHandler);
81 if (oldHandler == os::user_handler()) {
82 return (void *)2;
83 } else {
84 return oldHandler;
85 }
86 JVM_END
87
88
89 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
90 if (ReduceSignalUsage) {
91 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
92 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
93 // no handler for them is actually registered in JVM or via
94 // JVM_RegisterSignal.
95 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
96 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
97 return JNI_FALSE;
98 }
99 }
100 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
101 sig == SHUTDOWN3_SIGNAL) && os::Aix::is_sig_ignored(sig)) {
102 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
103 // is ignored, since no handler for them is actually registered in JVM
104 // or via JVM_RegisterSignal.
105 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
106 return JNI_FALSE;
107 }
108
109 os::signal_raise(sig);
110 return JNI_TRUE;
111 JVM_END
112
113 /*
114 All the defined signal names for Linux.
115
116 NOTE that not all of these names are accepted by our Java implementation
117
118 Via an existing claim by the VM, sigaction restrictions, or
119 the "rules of Unix" some of these names will be rejected at runtime.
120 For example the VM sets up to handle USR1, sigaction returns EINVAL for
121 STOP, and Linux simply doesn't allow catching of KILL.
122
123 Here are the names currently accepted by a user of sun.misc.Signal with
124 1.4.1 (ignoring potential interaction with use of chaining, etc):
125
126 HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
127 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
128 WINCH, POLL, IO, PWR, SYS
129
130 */
131
132 struct siglabel {
133 const char *name;
134 int number;
135 };
136
137 struct siglabel siglabels[] = {
138 /* derived from /usr/include/bits/signum.h on RH7.2 */
139 "HUP", SIGHUP, /* Hangup (POSIX). */
140 "INT", SIGINT, /* Interrupt (ANSI). */
141 "QUIT", SIGQUIT, /* Quit (POSIX). */
142 "ILL", SIGILL, /* Illegal instruction (ANSI). */
143 "TRAP", SIGTRAP, /* Trace trap (POSIX). */
144 "ABRT", SIGABRT, /* Abort (ANSI). */
145 "IOT", SIGIOT, /* IOT trap (4.2 BSD). */
146 "BUS", SIGBUS, /* BUS error (4.2 BSD). */
147 "FPE", SIGFPE, /* Floating-point exception (ANSI). */
148 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
149 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
150 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
151 "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */
152 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
153 "ALRM", SIGALRM, /* Alarm clock (POSIX). */
154 "TERM", SIGTERM, /* Termination (ANSI). */
155 #ifdef SIGSTKFLT
156 "STKFLT", SIGSTKFLT, /* Stack fault. */
157 #endif
158 "CLD", SIGCLD, /* Same as SIGCHLD (System V). */
159 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
160 "CONT", SIGCONT, /* Continue (POSIX). */
161 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
162 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
163 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
164 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
165 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
166 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
167 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
168 "DANGER", SIGDANGER, /* System crash imminent; free up some page space (AIX). */
169 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
170 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
171 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
172 "POLL", SIGPOLL, /* Pollable event occurred (System V). */
173 "IO", SIGIO, /* I/O now possible (4.2 BSD). */
174 "PWR", SIGPWR, /* Power failure restart (System V). */
175 #ifdef SIGSYS
176 "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */
177 #endif
178 };
179
180 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
181
182 /* find and return the named signal's number */
183
184 for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
185 if(!strcmp(name, siglabels[i].name))
186 return siglabels[i].number;
187
188 return -1;
189
190 JVM_END
191
192 // used by os::exception_name()
193 extern bool signal_name(int signo, char* buf, size_t len) {
194 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
195 if (signo == siglabels[i].number) {
196 jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
197 return true;
198 }
199 }
200 return false;
201 }

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