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src/os/solaris/vm/jvm_solaris.cpp@f73af4455d7d (annotated)

src/os/solaris/vm/jvm_solaris.cpp

Thu, 29 May 2014 09:56:06 -0700

author
asaha
date
Thu, 29 May 2014 09:56:06 -0700
changeset 6782
f73af4455d7d
parent 2314
f95d63e2154a
child 6876
710a3c8b516e
permissions
-rw-r--r--

Merge

duke@435 1 /*
stefank@2314 2 * Copyright (c) 1998, 2010, 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 // sun.misc.Signal ///////////////////////////////////////////////////////////
duke@435 33 // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
duke@435 34 /*
duke@435 35 * This function is included primarily as a debugging aid. If Java is
duke@435 36 * running in a console window, then pressing <CTRL-\\> will cause
duke@435 37 * the current state of all active threads and monitors to be written
duke@435 38 * to the console window.
duke@435 39 */
duke@435 40
duke@435 41 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
duke@435 42 // Copied from classic vm
duke@435 43 // signals_md.c 1.4 98/08/23
duke@435 44 void* newHandler = handler == (void *)2
duke@435 45 ? os::user_handler()
duke@435 46 : handler;
duke@435 47 switch (sig) {
duke@435 48 /* The following are already used by the VM. */
duke@435 49 case SIGFPE:
duke@435 50 case SIGILL:
duke@435 51 case SIGSEGV:
duke@435 52
duke@435 53 /* The following signal is used by the VM to dump thread stacks unless
duke@435 54 ReduceSignalUsage is set, in which case the user is allowed to set
duke@435 55 his own _native_ handler for this signal; thus, in either case,
duke@435 56 we do not allow JVM_RegisterSignal to change the handler. */
duke@435 57 case BREAK_SIGNAL:
duke@435 58 return (void *)-1;
duke@435 59
duke@435 60 /* The following signals are used for Shutdown Hooks support. However, if
duke@435 61 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
duke@435 62 System.exit(), Java is not allowed to use these signals, and the the
duke@435 63 user is allowed to set his own _native_ handler for these signals and
duke@435 64 invoke System.exit() as needed. Terminator.setup() is avoiding
duke@435 65 registration of these signals when -Xrs is present.
duke@435 66 - If the HUP signal is ignored (from the nohup) command, then Java
duke@435 67 is not allowed to use this signal.
duke@435 68 */
duke@435 69 case SHUTDOWN1_SIGNAL:
duke@435 70 case SHUTDOWN2_SIGNAL:
duke@435 71 case SHUTDOWN3_SIGNAL:
duke@435 72 if (ReduceSignalUsage) return (void*)-1;
duke@435 73 if (os::Solaris::is_sig_ignored(sig)) return (void*)1;
duke@435 74 }
duke@435 75
duke@435 76 /* Check parameterized signals. Don't allow sharing of our interrupt signal */
duke@435 77 if (sig == os::Solaris::SIGinterrupt()) {
duke@435 78 return (void *)-1;
duke@435 79 }
duke@435 80
duke@435 81 void* oldHandler = os::signal(sig, newHandler);
duke@435 82 if (oldHandler == os::user_handler()) {
duke@435 83 return (void *)2;
duke@435 84 } else {
duke@435 85 return oldHandler;
duke@435 86 }
duke@435 87 JVM_END
duke@435 88
duke@435 89
duke@435 90 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
duke@435 91 if (ReduceSignalUsage) {
duke@435 92 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
duke@435 93 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
duke@435 94 // no handler for them is actually registered in JVM or via
duke@435 95 // JVM_RegisterSignal.
duke@435 96 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
duke@435 97 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
duke@435 98 return JNI_FALSE;
duke@435 99 }
duke@435 100 }
duke@435 101 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
duke@435 102 sig == SHUTDOWN3_SIGNAL) && os::Solaris::is_sig_ignored(sig)) {
duke@435 103 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
duke@435 104 // is ignored, since no handler for them is actually registered in JVM
duke@435 105 // or via JVM_RegisterSignal.
duke@435 106 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
duke@435 107 return JNI_FALSE;
duke@435 108 }
duke@435 109
duke@435 110 os::signal_raise(sig);
duke@435 111 return JNI_TRUE;
duke@435 112 JVM_END
duke@435 113
duke@435 114
duke@435 115 /*
duke@435 116 All the defined signal names for Solaris are defined by str2sig().
duke@435 117
duke@435 118 NOTE that not all of these names are accepted by our Java implementation
duke@435 119
duke@435 120 Via an existing claim by the VM, sigaction restrictions, or
duke@435 121 the "rules of Unix" some of these names will be rejected at runtime.
duke@435 122 For example the VM sets up to handle USR1, sigaction returns EINVAL for
duke@435 123 CANCEL, and Solaris simply doesn't allow catching of KILL.
duke@435 124
duke@435 125 Here are the names currently accepted by a user of sun.misc.Signal with
duke@435 126 1.4.1 (ignoring potential interaction with use of chaining, etc):
duke@435 127
duke@435 128 HUP, INT, TRAP, IOT, ABRT, EMT, BUS, SYS, PIPE, ALRM, TERM, USR2,
duke@435 129 CLD, CHLD, PWR, WINCH, URG, POLL, IO, TSTP, CONT, TTIN, TTOU, VTALRM,
duke@435 130 PROF, XCPU, XFSZ, FREEZE, THAW, LOST
duke@435 131 */
duke@435 132
duke@435 133 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
duke@435 134
duke@435 135 int sig;
duke@435 136
duke@435 137 /* return the named signal's number */
duke@435 138
duke@435 139 if(str2sig(name, &sig))
duke@435 140 return -1;
duke@435 141 else
duke@435 142 return sig;
duke@435 143
duke@435 144 JVM_END
duke@435 145
duke@435 146
duke@435 147 //Reconciliation History
duke@435 148 // 1.4 98/10/07 13:39:41 jvm_win32.cpp
duke@435 149 // 1.6 99/06/22 16:39:00 jvm_win32.cpp
duke@435 150 //End

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