--- /dev/null Wed Sep 21 11:41:53 2011 +++ new/src/os/bsd/vm/jvm_bsd.cpp Wed Sep 21 11:42:22 2011 @@ -0,0 +1,192 @@ +/* + * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "prims/jvm.h" +#include "runtime/interfaceSupport.hpp" +#include "runtime/osThread.hpp" + +#include + + +// sun.misc.Signal /////////////////////////////////////////////////////////// +// Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23 +/* + * This function is included primarily as a debugging aid. If Java is + * running in a console window, then pressing will cause + * the current state of all active threads and monitors to be written + * to the console window. + */ + +JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler)) + // Copied from classic vm + // signals_md.c 1.4 98/08/23 + void* newHandler = handler == (void *)2 + ? os::user_handler() + : handler; + switch (sig) { + /* The following are already used by the VM. */ + case INTERRUPT_SIGNAL: + case SIGFPE: + case SIGILL: + case SIGSEGV: + + /* The following signal is used by the VM to dump thread stacks unless + ReduceSignalUsage is set, in which case the user is allowed to set + his own _native_ handler for this signal; thus, in either case, + we do not allow JVM_RegisterSignal to change the handler. */ + case BREAK_SIGNAL: + return (void *)-1; + + /* The following signals are used for Shutdown Hooks support. However, if + ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via + System.exit(), Java is not allowed to use these signals, and the the + user is allowed to set his own _native_ handler for these signals and + invoke System.exit() as needed. Terminator.setup() is avoiding + registration of these signals when -Xrs is present. + - If the HUP signal is ignored (from the nohup) command, then Java + is not allowed to use this signal. + */ + + case SHUTDOWN1_SIGNAL: + case SHUTDOWN2_SIGNAL: + case SHUTDOWN3_SIGNAL: + if (ReduceSignalUsage) return (void*)-1; + if (os::Bsd::is_sig_ignored(sig)) return (void*)1; + } + + void* oldHandler = os::signal(sig, newHandler); + if (oldHandler == os::user_handler()) { + return (void *)2; + } else { + return oldHandler; + } +JVM_END + + +JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig)) + if (ReduceSignalUsage) { + // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL, + // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since + // no handler for them is actually registered in JVM or via + // JVM_RegisterSignal. + if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL || + sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) { + return JNI_FALSE; + } + } + else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL || + sig == SHUTDOWN3_SIGNAL) && os::Bsd::is_sig_ignored(sig)) { + // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL + // is ignored, since no handler for them is actually registered in JVM + // or via JVM_RegisterSignal. + // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL + return JNI_FALSE; + } + + os::signal_raise(sig); + return JNI_TRUE; +JVM_END + +/* + All the defined signal names for Bsd. + + NOTE that not all of these names are accepted by our Java implementation + + Via an existing claim by the VM, sigaction restrictions, or + the "rules of Unix" some of these names will be rejected at runtime. + For example the VM sets up to handle USR1, sigaction returns EINVAL for + STOP, and Bsd simply doesn't allow catching of KILL. + + Here are the names currently accepted by a user of sun.misc.Signal with + 1.4.1 (ignoring potential interaction with use of chaining, etc): + + HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT, + CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF, + WINCH, POLL, IO, PWR, SYS + +*/ + +struct siglabel { + const char *name; + int number; +}; + +struct siglabel siglabels[] = { + /* derived from /usr/include/bits/signum.h on RH7.2 */ + "HUP", SIGHUP, /* Hangup (POSIX). */ + "INT", SIGINT, /* Interrupt (ANSI). */ + "QUIT", SIGQUIT, /* Quit (POSIX). */ + "ILL", SIGILL, /* Illegal instruction (ANSI). */ + "TRAP", SIGTRAP, /* Trace trap (POSIX). */ + "ABRT", SIGABRT, /* Abort (ANSI). */ + "EMT", SIGEMT, /* EMT trap */ + "FPE", SIGFPE, /* Floating-point exception (ANSI). */ + "KILL", SIGKILL, /* Kill, unblockable (POSIX). */ + "BUS", SIGBUS, /* BUS error (4.2 BSD). */ + "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */ + "SYS", SIGSYS, /* Bad system call. Only on some Bsden! */ + "PIPE", SIGPIPE, /* Broken pipe (POSIX). */ + "ALRM", SIGALRM, /* Alarm clock (POSIX). */ + "TERM", SIGTERM, /* Termination (ANSI). */ + "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */ + "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */ + "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */ + "CONT", SIGCONT, /* Continue (POSIX). */ + "CHLD", SIGCHLD, /* Child status has changed (POSIX). */ + "TTIN", SIGTTIN, /* Background read from tty (POSIX). */ + "TTOU", SIGTTOU, /* Background write to tty (POSIX). */ + "IO", SIGIO, /* I/O now possible (4.2 BSD). */ + "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */ + "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */ + "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */ + "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */ + "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */ + "INFO", SIGINFO, /* Information request. */ + "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */ + "USR2", SIGUSR2 /* User-defined signal 2 (POSIX). */ + }; + +JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) + + /* find and return the named signal's number */ + + for(uint i=0; i