0
|
1 /*
|
|
2 * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
20 * CA 95054 USA or visit www.sun.com if you need additional information or
|
|
21 * have any questions.
|
|
22 *
|
|
23 */
|
|
24
|
|
25 #include "incls/_precompiled.incl"
|
|
26 #include "incls/_jvm_linux.cpp.incl"
|
|
27
|
|
28 #include <signal.h>
|
|
29
|
|
30 /*
|
|
31 * FIXME: This is temporary hack to keep Linux Runtime.exec()
|
|
32 * code happy. See $JDK/src/linux/native/java/lang/UnixProcess_md.c
|
|
33 */
|
|
34 int _JVM_native_threads = 1;
|
|
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-\\> 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 /* The following are already used by the VM. */
|
|
53 case INTERRUPT_SIGNAL:
|
|
54 case SIGFPE:
|
|
55 case SIGILL:
|
|
56 case SIGSEGV:
|
|
57
|
|
58 /* The following signal is used by the VM to dump thread stacks unless
|
|
59 ReduceSignalUsage is set, in which case the user is allowed to set
|
|
60 his own _native_ handler for this signal; thus, in either case,
|
|
61 we do not allow JVM_RegisterSignal to change the handler. */
|
|
62 case BREAK_SIGNAL:
|
|
63 return (void *)-1;
|
|
64
|
|
65 /* The following signals are used for Shutdown Hooks support. However, if
|
|
66 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
|
|
67 System.exit(), Java is not allowed to use these signals, and the the
|
|
68 user is allowed to set his own _native_ handler for these signals and
|
|
69 invoke System.exit() as needed. Terminator.setup() is avoiding
|
|
70 registration of these signals when -Xrs is present.
|
|
71 - If the HUP signal is ignored (from the nohup) command, then Java
|
|
72 is not allowed to use this signal.
|
|
73 */
|
|
74
|
|
75 case SHUTDOWN1_SIGNAL:
|
|
76 case SHUTDOWN2_SIGNAL:
|
|
77 case SHUTDOWN3_SIGNAL:
|
|
78 if (ReduceSignalUsage) return (void*)-1;
|
|
79 if (os::Linux::is_sig_ignored(sig)) return (void*)1;
|
|
80 }
|
|
81
|
|
82 void* oldHandler = os::signal(sig, newHandler);
|
|
83 if (oldHandler == os::user_handler()) {
|
|
84 return (void *)2;
|
|
85 } else {
|
|
86 return oldHandler;
|
|
87 }
|
|
88 JVM_END
|
|
89
|
|
90
|
|
91 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
|
|
92 if (ReduceSignalUsage) {
|
|
93 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
|
|
94 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
|
|
95 // no handler for them is actually registered in JVM or via
|
|
96 // JVM_RegisterSignal.
|
|
97 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
|
|
98 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
|
|
99 return JNI_FALSE;
|
|
100 }
|
|
101 }
|
|
102 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
|
|
103 sig == SHUTDOWN3_SIGNAL) && os::Linux::is_sig_ignored(sig)) {
|
|
104 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
|
|
105 // is ignored, since no handler for them is actually registered in JVM
|
|
106 // or via JVM_RegisterSignal.
|
|
107 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
|
|
108 return JNI_FALSE;
|
|
109 }
|
|
110
|
|
111 os::signal_raise(sig);
|
|
112 return JNI_TRUE;
|
|
113 JVM_END
|
|
114
|
|
115 /*
|
|
116 All the defined signal names for Linux.
|
|
117
|
|
118 NOTE that not all of these names are accepted by our Java implementation
|
|
119
|
|
120 Via an existing claim by the VM, sigaction restrictions, or
|
|
121 the "rules of Unix" some of these names will be rejected at runtime.
|
|
122 For example the VM sets up to handle USR1, sigaction returns EINVAL for
|
|
123 STOP, and Linux simply doesn't allow catching of KILL.
|
|
124
|
|
125 Here are the names currently accepted by a user of sun.misc.Signal with
|
|
126 1.4.1 (ignoring potential interaction with use of chaining, etc):
|
|
127
|
|
128 HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
|
|
129 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
|
|
130 WINCH, POLL, IO, PWR, SYS
|
|
131
|
|
132 */
|
|
133
|
|
134 struct siglabel {
|
|
135 char *name;
|
|
136 int number;
|
|
137 };
|
|
138
|
|
139 struct siglabel siglabels[] = {
|
|
140 /* derived from /usr/include/bits/signum.h on RH7.2 */
|
|
141 "HUP", SIGHUP, /* Hangup (POSIX). */
|
|
142 "INT", SIGINT, /* Interrupt (ANSI). */
|
|
143 "QUIT", SIGQUIT, /* Quit (POSIX). */
|
|
144 "ILL", SIGILL, /* Illegal instruction (ANSI). */
|
|
145 "TRAP", SIGTRAP, /* Trace trap (POSIX). */
|
|
146 "ABRT", SIGABRT, /* Abort (ANSI). */
|
|
147 "IOT", SIGIOT, /* IOT trap (4.2 BSD). */
|
|
148 "BUS", SIGBUS, /* BUS error (4.2 BSD). */
|
|
149 "FPE", SIGFPE, /* Floating-point exception (ANSI). */
|
|
150 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
|
|
151 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
|
|
152 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
|
|
153 "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */
|
|
154 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
|
|
155 "ALRM", SIGALRM, /* Alarm clock (POSIX). */
|
|
156 "TERM", SIGTERM, /* Termination (ANSI). */
|
|
157 #ifdef SIGSTKFLT
|
|
158 "STKFLT", SIGSTKFLT, /* Stack fault. */
|
|
159 #endif
|
|
160 "CLD", SIGCLD, /* Same as SIGCHLD (System V). */
|
|
161 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
|
|
162 "CONT", SIGCONT, /* Continue (POSIX). */
|
|
163 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
|
|
164 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
|
|
165 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
|
|
166 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
|
|
167 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
|
|
168 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
|
|
169 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
|
|
170 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
|
|
171 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
|
|
172 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
|
|
173 "POLL", SIGPOLL, /* Pollable event occurred (System V). */
|
|
174 "IO", SIGIO, /* I/O now possible (4.2 BSD). */
|
|
175 "PWR", SIGPWR, /* Power failure restart (System V). */
|
|
176 #ifdef SIGSYS
|
|
177 "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */
|
|
178 #endif
|
|
179 };
|
|
180
|
|
181 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
|
|
182
|
|
183 /* find and return the named signal's number */
|
|
184
|
|
185 for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
|
|
186 if(!strcmp(name, siglabels[i].name))
|
|
187 return siglabels[i].number;
|
|
188
|
|
189 return -1;
|
|
190
|
|
191 JVM_END
|
|
192
|
|
193 // used by os::exception_name()
|
|
194 extern bool signal_name(int signo, char* buf, size_t len) {
|
|
195 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
|
|
196 if (signo == siglabels[i].number) {
|
|
197 jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
|
|
198 return true;
|
|
199 }
|
|
200 }
|
|
201 return false;
|
|
202 }
|