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products/sources/formale Sprachen/Java/Openjdk/src/hotspot/os/posix/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 4 kB

Quelle jvm_posix.cpp Sprache: C

/*
* Copyright (c) 1999, 2022, 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 "jvm.h"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/osThread.hpp"
#include "signals_posix.hpp"

#include <signal.h>

// jdk.internal.misc.Signal ///////////////////////////////////////////////////////////

/*
* This function is included primarily as a debugging aid. If Java is
* running in a console window, then pressing <CTRL-\\> 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))
  void* newHandler = handler == (void *)2
                   ? PosixSignals::user_handler()
                   : handler;
  switch (sig) {
    /* The following are already used by the VM. */
    case SIGFPE:
    case SIGILL:
    case SIGSEGV:

#if defined(__APPLE__)
    /* On Darwin, memory access errors commonly results in SIGBUS instead
     * of SIGSEGV. */
    case SIGBUS:
#endif

    /* 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
       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 (PosixSignals::is_sig_ignored(sig)) return (void*)1;
  }

  void* oldHandler = PosixSignals::install_generic_signal_handler(sig, newHandler);
  if (oldHandler == PosixSignals::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) && PosixSignals::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;
  }

  ::raise(sig);
  return JNI_TRUE;
JVM_END

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