duke@435: /* stefank@2314: * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. duke@435: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. duke@435: * duke@435: * This code is free software; you can redistribute it and/or modify it duke@435: * under the terms of the GNU General Public License version 2 only, as duke@435: * published by the Free Software Foundation. duke@435: * duke@435: * This code is distributed in the hope that it will be useful, but WITHOUT duke@435: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or duke@435: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License duke@435: * version 2 for more details (a copy is included in the LICENSE file that duke@435: * accompanied this code). duke@435: * duke@435: * You should have received a copy of the GNU General Public License version duke@435: * 2 along with this work; if not, write to the Free Software Foundation, duke@435: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. duke@435: * trims@1907: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA trims@1907: * or visit www.oracle.com if you need additional information or have any trims@1907: * questions. duke@435: * duke@435: */ duke@435: stefank@2314: #include "precompiled.hpp" stefank@2314: #include "prims/jvm.h" stefank@2314: #include "runtime/interfaceSupport.hpp" stefank@2314: #include "runtime/osThread.hpp" duke@435: duke@435: #include duke@435: duke@435: // sun.misc.Signal /////////////////////////////////////////////////////////// duke@435: // Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23 duke@435: /* duke@435: * This function is included primarily as a debugging aid. If Java is duke@435: * running in a console window, then pressing will cause duke@435: * the current state of all active threads and monitors to be written duke@435: * to the console window. duke@435: */ duke@435: duke@435: JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler)) duke@435: // Copied from classic vm duke@435: // signals_md.c 1.4 98/08/23 duke@435: void* newHandler = handler == (void *)2 duke@435: ? os::user_handler() duke@435: : handler; duke@435: switch (sig) { duke@435: /* The following are already used by the VM. */ duke@435: case SIGFPE: duke@435: case SIGILL: duke@435: case SIGSEGV: duke@435: duke@435: /* The following signal is used by the VM to dump thread stacks unless duke@435: ReduceSignalUsage is set, in which case the user is allowed to set duke@435: his own _native_ handler for this signal; thus, in either case, duke@435: we do not allow JVM_RegisterSignal to change the handler. */ duke@435: case BREAK_SIGNAL: duke@435: return (void *)-1; duke@435: duke@435: /* The following signals are used for Shutdown Hooks support. However, if duke@435: ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via duke@435: System.exit(), Java is not allowed to use these signals, and the the duke@435: user is allowed to set his own _native_ handler for these signals and duke@435: invoke System.exit() as needed. Terminator.setup() is avoiding duke@435: registration of these signals when -Xrs is present. duke@435: - If the HUP signal is ignored (from the nohup) command, then Java duke@435: is not allowed to use this signal. duke@435: */ duke@435: case SHUTDOWN1_SIGNAL: duke@435: case SHUTDOWN2_SIGNAL: duke@435: case SHUTDOWN3_SIGNAL: duke@435: if (ReduceSignalUsage) return (void*)-1; duke@435: if (os::Solaris::is_sig_ignored(sig)) return (void*)1; duke@435: } duke@435: duke@435: /* Check parameterized signals. Don't allow sharing of our interrupt signal */ duke@435: if (sig == os::Solaris::SIGinterrupt()) { duke@435: return (void *)-1; duke@435: } duke@435: duke@435: void* oldHandler = os::signal(sig, newHandler); duke@435: if (oldHandler == os::user_handler()) { duke@435: return (void *)2; duke@435: } else { duke@435: return oldHandler; duke@435: } duke@435: JVM_END duke@435: duke@435: duke@435: JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig)) duke@435: if (ReduceSignalUsage) { duke@435: // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL, duke@435: // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since duke@435: // no handler for them is actually registered in JVM or via duke@435: // JVM_RegisterSignal. duke@435: if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL || duke@435: sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) { duke@435: return JNI_FALSE; duke@435: } duke@435: } duke@435: else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL || duke@435: sig == SHUTDOWN3_SIGNAL) && os::Solaris::is_sig_ignored(sig)) { duke@435: // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL duke@435: // is ignored, since no handler for them is actually registered in JVM duke@435: // or via JVM_RegisterSignal. duke@435: // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL duke@435: return JNI_FALSE; duke@435: } duke@435: duke@435: os::signal_raise(sig); duke@435: return JNI_TRUE; duke@435: JVM_END duke@435: duke@435: duke@435: /* duke@435: All the defined signal names for Solaris are defined by str2sig(). duke@435: duke@435: NOTE that not all of these names are accepted by our Java implementation duke@435: duke@435: Via an existing claim by the VM, sigaction restrictions, or duke@435: the "rules of Unix" some of these names will be rejected at runtime. duke@435: For example the VM sets up to handle USR1, sigaction returns EINVAL for duke@435: CANCEL, and Solaris simply doesn't allow catching of KILL. duke@435: duke@435: Here are the names currently accepted by a user of sun.misc.Signal with duke@435: 1.4.1 (ignoring potential interaction with use of chaining, etc): duke@435: duke@435: HUP, INT, TRAP, IOT, ABRT, EMT, BUS, SYS, PIPE, ALRM, TERM, USR2, duke@435: CLD, CHLD, PWR, WINCH, URG, POLL, IO, TSTP, CONT, TTIN, TTOU, VTALRM, duke@435: PROF, XCPU, XFSZ, FREEZE, THAW, LOST duke@435: */ duke@435: duke@435: JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) duke@435: duke@435: int sig; duke@435: duke@435: /* return the named signal's number */ duke@435: duke@435: if(str2sig(name, &sig)) duke@435: return -1; duke@435: else duke@435: return sig; duke@435: duke@435: JVM_END duke@435: duke@435: duke@435: //Reconciliation History duke@435: // 1.4 98/10/07 13:39:41 jvm_win32.cpp duke@435: // 1.6 99/06/22 16:39:00 jvm_win32.cpp duke@435: //End