Mercurial > hg > truffle
annotate src/os/linux/vm/jvm_linux.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | f139919897d2 |
| children | f95d63e2154a |
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| 0 | 1 /* |
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2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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 { | |
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135 const char *name; |
| 0 | 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 } |