duke@435: /* trims@2708: * Copyright (c) 1999, 2011, 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: 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 INTERRUPT_SIGNAL: 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: 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::Linux::is_sig_ignored(sig)) 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::Linux::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: All the defined signal names for Linux. 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: STOP, and Linux 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, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT, duke@435: CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF, duke@435: WINCH, POLL, IO, PWR, SYS duke@435: duke@435: */ duke@435: duke@435: struct siglabel { xlu@634: const char *name; duke@435: int number; duke@435: }; duke@435: duke@435: struct siglabel siglabels[] = { duke@435: /* derived from /usr/include/bits/signum.h on RH7.2 */ duke@435: "HUP", SIGHUP, /* Hangup (POSIX). */ duke@435: "INT", SIGINT, /* Interrupt (ANSI). */ duke@435: "QUIT", SIGQUIT, /* Quit (POSIX). */ duke@435: "ILL", SIGILL, /* Illegal instruction (ANSI). */ duke@435: "TRAP", SIGTRAP, /* Trace trap (POSIX). */ duke@435: "ABRT", SIGABRT, /* Abort (ANSI). */ duke@435: "IOT", SIGIOT, /* IOT trap (4.2 BSD). */ duke@435: "BUS", SIGBUS, /* BUS error (4.2 BSD). */ duke@435: "FPE", SIGFPE, /* Floating-point exception (ANSI). */ duke@435: "KILL", SIGKILL, /* Kill, unblockable (POSIX). */ duke@435: "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */ duke@435: "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */ duke@435: "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */ duke@435: "PIPE", SIGPIPE, /* Broken pipe (POSIX). */ duke@435: "ALRM", SIGALRM, /* Alarm clock (POSIX). */ duke@435: "TERM", SIGTERM, /* Termination (ANSI). */ duke@435: #ifdef SIGSTKFLT duke@435: "STKFLT", SIGSTKFLT, /* Stack fault. */ duke@435: #endif duke@435: "CLD", SIGCLD, /* Same as SIGCHLD (System V). */ duke@435: "CHLD", SIGCHLD, /* Child status has changed (POSIX). */ duke@435: "CONT", SIGCONT, /* Continue (POSIX). */ duke@435: "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */ duke@435: "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */ duke@435: "TTIN", SIGTTIN, /* Background read from tty (POSIX). */ duke@435: "TTOU", SIGTTOU, /* Background write to tty (POSIX). */ duke@435: "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */ duke@435: "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */ duke@435: "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */ duke@435: "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */ duke@435: "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */ duke@435: "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */ duke@435: "POLL", SIGPOLL, /* Pollable event occurred (System V). */ duke@435: "IO", SIGIO, /* I/O now possible (4.2 BSD). */ duke@435: "PWR", SIGPWR, /* Power failure restart (System V). */ duke@435: #ifdef SIGSYS duke@435: "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */ duke@435: #endif duke@435: }; duke@435: duke@435: JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name)) duke@435: duke@435: /* find and return the named signal's number */ duke@435: duke@435: for(uint i=0; i