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src/os/linux/vm/jvm_linux.cpp@bbfbe9b06038 (annotated)

src/os/linux/vm/jvm_linux.cpp

Thu, 13 Mar 2014 14:57:01 -0700

author
kvn
date
Thu, 13 Mar 2014 14:57:01 -0700
changeset 6513
bbfbe9b06038
parent 2708
1d1603768966
child 6876
710a3c8b516e
permissions
-rw-r--r--

Merge

duke@435 1 /*
trims@2708 2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
trims@1907 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907 20 * or visit www.oracle.com if you need additional information or have any
trims@1907 21 * questions.
duke@435 22 *
duke@435 23 */
duke@435 24
stefank@2314 25 #include "precompiled.hpp"
stefank@2314 26 #include "prims/jvm.h"
stefank@2314 27 #include "runtime/interfaceSupport.hpp"
stefank@2314 28 #include "runtime/osThread.hpp"
duke@435 29
duke@435 30 #include <signal.h>
duke@435 31
duke@435 32
duke@435 33 // sun.misc.Signal ///////////////////////////////////////////////////////////
duke@435 34 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
duke@435 35 /*
duke@435 36 * This function is included primarily as a debugging aid. If Java is
duke@435 37 * running in a console window, then pressing <CTRL-\\> will cause
duke@435 38 * the current state of all active threads and monitors to be written
duke@435 39 * to the console window.
duke@435 40 */
duke@435 41
duke@435 42 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
duke@435 43 // Copied from classic vm
duke@435 44 // signals_md.c 1.4 98/08/23
duke@435 45 void* newHandler = handler == (void *)2
duke@435 46 ? os::user_handler()
duke@435 47 : handler;
duke@435 48 switch (sig) {
duke@435 49 /* The following are already used by the VM. */
duke@435 50 case INTERRUPT_SIGNAL:
duke@435 51 case SIGFPE:
duke@435 52 case SIGILL:
duke@435 53 case SIGSEGV:
duke@435 54
duke@435 55 /* The following signal is used by the VM to dump thread stacks unless
duke@435 56 ReduceSignalUsage is set, in which case the user is allowed to set
duke@435 57 his own _native_ handler for this signal; thus, in either case,
duke@435 58 we do not allow JVM_RegisterSignal to change the handler. */
duke@435 59 case BREAK_SIGNAL:
duke@435 60 return (void *)-1;
duke@435 61
duke@435 62 /* The following signals are used for Shutdown Hooks support. However, if
duke@435 63 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
duke@435 64 System.exit(), Java is not allowed to use these signals, and the the
duke@435 65 user is allowed to set his own _native_ handler for these signals and
duke@435 66 invoke System.exit() as needed. Terminator.setup() is avoiding
duke@435 67 registration of these signals when -Xrs is present.
duke@435 68 - If the HUP signal is ignored (from the nohup) command, then Java
duke@435 69 is not allowed to use this signal.
duke@435 70 */
duke@435 71
duke@435 72 case SHUTDOWN1_SIGNAL:
duke@435 73 case SHUTDOWN2_SIGNAL:
duke@435 74 case SHUTDOWN3_SIGNAL:
duke@435 75 if (ReduceSignalUsage) return (void*)-1;
duke@435 76 if (os::Linux::is_sig_ignored(sig)) return (void*)1;
duke@435 77 }
duke@435 78
duke@435 79 void* oldHandler = os::signal(sig, newHandler);
duke@435 80 if (oldHandler == os::user_handler()) {
duke@435 81 return (void *)2;
duke@435 82 } else {
duke@435 83 return oldHandler;
duke@435 84 }
duke@435 85 JVM_END
duke@435 86
duke@435 87
duke@435 88 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
duke@435 89 if (ReduceSignalUsage) {
duke@435 90 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
duke@435 91 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
duke@435 92 // no handler for them is actually registered in JVM or via
duke@435 93 // JVM_RegisterSignal.
duke@435 94 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
duke@435 95 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
duke@435 96 return JNI_FALSE;
duke@435 97 }
duke@435 98 }
duke@435 99 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
duke@435 100 sig == SHUTDOWN3_SIGNAL) && os::Linux::is_sig_ignored(sig)) {
duke@435 101 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
duke@435 102 // is ignored, since no handler for them is actually registered in JVM
duke@435 103 // or via JVM_RegisterSignal.
duke@435 104 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
duke@435 105 return JNI_FALSE;
duke@435 106 }
duke@435 107
duke@435 108 os::signal_raise(sig);
duke@435 109 return JNI_TRUE;
duke@435 110 JVM_END
duke@435 111
duke@435 112 /*
duke@435 113 All the defined signal names for Linux.
duke@435 114
duke@435 115 NOTE that not all of these names are accepted by our Java implementation
duke@435 116
duke@435 117 Via an existing claim by the VM, sigaction restrictions, or
duke@435 118 the "rules of Unix" some of these names will be rejected at runtime.
duke@435 119 For example the VM sets up to handle USR1, sigaction returns EINVAL for
duke@435 120 STOP, and Linux simply doesn't allow catching of KILL.
duke@435 121
duke@435 122 Here are the names currently accepted by a user of sun.misc.Signal with
duke@435 123 1.4.1 (ignoring potential interaction with use of chaining, etc):
duke@435 124
duke@435 125 HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
duke@435 126 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
duke@435 127 WINCH, POLL, IO, PWR, SYS
duke@435 128
duke@435 129 */
duke@435 130
duke@435 131 struct siglabel {
xlu@634 132 const char *name;
duke@435 133 int number;
duke@435 134 };
duke@435 135
duke@435 136 struct siglabel siglabels[] = {
duke@435 137 /* derived from /usr/include/bits/signum.h on RH7.2 */
duke@435 138 "HUP", SIGHUP, /* Hangup (POSIX). */
duke@435 139 "INT", SIGINT, /* Interrupt (ANSI). */
duke@435 140 "QUIT", SIGQUIT, /* Quit (POSIX). */
duke@435 141 "ILL", SIGILL, /* Illegal instruction (ANSI). */
duke@435 142 "TRAP", SIGTRAP, /* Trace trap (POSIX). */
duke@435 143 "ABRT", SIGABRT, /* Abort (ANSI). */
duke@435 144 "IOT", SIGIOT, /* IOT trap (4.2 BSD). */
duke@435 145 "BUS", SIGBUS, /* BUS error (4.2 BSD). */
duke@435 146 "FPE", SIGFPE, /* Floating-point exception (ANSI). */
duke@435 147 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
duke@435 148 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
duke@435 149 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
duke@435 150 "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */
duke@435 151 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
duke@435 152 "ALRM", SIGALRM, /* Alarm clock (POSIX). */
duke@435 153 "TERM", SIGTERM, /* Termination (ANSI). */
duke@435 154 #ifdef SIGSTKFLT
duke@435 155 "STKFLT", SIGSTKFLT, /* Stack fault. */
duke@435 156 #endif
duke@435 157 "CLD", SIGCLD, /* Same as SIGCHLD (System V). */
duke@435 158 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
duke@435 159 "CONT", SIGCONT, /* Continue (POSIX). */
duke@435 160 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
duke@435 161 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
duke@435 162 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
duke@435 163 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
duke@435 164 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
duke@435 165 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
duke@435 166 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
duke@435 167 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
duke@435 168 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
duke@435 169 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
duke@435 170 "POLL", SIGPOLL, /* Pollable event occurred (System V). */
duke@435 171 "IO", SIGIO, /* I/O now possible (4.2 BSD). */
duke@435 172 "PWR", SIGPWR, /* Power failure restart (System V). */
duke@435 173 #ifdef SIGSYS
duke@435 174 "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */
duke@435 175 #endif
duke@435 176 };
duke@435 177
duke@435 178 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
duke@435 179
duke@435 180 /* find and return the named signal's number */
duke@435 181
duke@435 182 for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
duke@435 183 if(!strcmp(name, siglabels[i].name))
duke@435 184 return siglabels[i].number;
duke@435 185
duke@435 186 return -1;
duke@435 187
duke@435 188 JVM_END
duke@435 189
duke@435 190 // used by os::exception_name()
duke@435 191 extern bool signal_name(int signo, char* buf, size_t len) {
duke@435 192 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
duke@435 193 if (signo == siglabels[i].number) {
duke@435 194 jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
duke@435 195 return true;
duke@435 196 }
duke@435 197 }
duke@435 198 return false;
duke@435 199 }

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