61        ReduceSignalUsage is set, in which case the user is allowed to set
  62        his own _native_ handler for this signal; thus, in either case,
  63        we do not allow JVM_RegisterSignal to change the handler. */
  64     case BREAK_SIGNAL:
  65       return (void *)-1;
  66 
  67     /* The following signals are used for Shutdown Hooks support. However, if
  68        ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
  69        System.exit(), Java is not allowed to use these signals, and the the
  70        user is allowed to set his own _native_ handler for these signals and
  71        invoke System.exit() as needed. Terminator.setup() is avoiding
  72        registration of these signals when -Xrs is present.
  73        - If the HUP signal is ignored (from the nohup) command, then Java
  74          is not allowed to use this signal.
  75      */
  76 
  77     case SHUTDOWN1_SIGNAL:
  78     case SHUTDOWN2_SIGNAL:
  79     case SHUTDOWN3_SIGNAL:
  80       if (ReduceSignalUsage) return (void*)-1;
  81       if (os::Bsd::is_sig_ignored(sig)) return (void*)1;
  82   }
  83 
  84   void* oldHandler = os::signal(sig, newHandler);
  85   if (oldHandler == os::user_handler()) {
  86       return (void *)2;
  87   } else {
  88       return oldHandler;
  89   }
  90 JVM_END
  91 
  92 
  93 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
  94   if (ReduceSignalUsage) {
  95     // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
  96     // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
  97     // no handler for them is actually registered in JVM or via
  98     // JVM_RegisterSignal.
  99     if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
 100         sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
 101       return JNI_FALSE;
 102     }
 103   }
 104   else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
 105             sig == SHUTDOWN3_SIGNAL) && os::Bsd::is_sig_ignored(sig)) {
 106     // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
 107     // is ignored, since no handler for them is actually registered in JVM
 108     // or via JVM_RegisterSignal.
 109     // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
 110     return JNI_FALSE;
 111   }
 112 
 113   os::signal_raise(sig);
 114   return JNI_TRUE;
 115 JVM_END
 116 

  61        ReduceSignalUsage is set, in which case the user is allowed to set
  62        his own _native_ handler for this signal; thus, in either case,
  63        we do not allow JVM_RegisterSignal to change the handler. */
  64     case BREAK_SIGNAL:
  65       return (void *)-1;
  66 
  67     /* The following signals are used for Shutdown Hooks support. However, if
  68        ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
  69        System.exit(), Java is not allowed to use these signals, and the the
  70        user is allowed to set his own _native_ handler for these signals and
  71        invoke System.exit() as needed. Terminator.setup() is avoiding
  72        registration of these signals when -Xrs is present.
  73        - If the HUP signal is ignored (from the nohup) command, then Java
  74          is not allowed to use this signal.
  75      */
  76 
  77     case SHUTDOWN1_SIGNAL:
  78     case SHUTDOWN2_SIGNAL:
  79     case SHUTDOWN3_SIGNAL:
  80       if (ReduceSignalUsage) return (void*)-1;
  81       if (os::Posix::is_sig_ignored(sig)) return (void*)1;
  82   }
  83 
  84   void* oldHandler = os::signal(sig, newHandler);
  85   if (oldHandler == os::user_handler()) {
  86       return (void *)2;
  87   } else {
  88       return oldHandler;
  89   }
  90 JVM_END
  91 
  92 
  93 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
  94   if (ReduceSignalUsage) {
  95     // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
  96     // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
  97     // no handler for them is actually registered in JVM or via
  98     // JVM_RegisterSignal.
  99     if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
 100         sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
 101       return JNI_FALSE;
 102     }
 103   }
 104   else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
 105             sig == SHUTDOWN3_SIGNAL) && os::Posix::is_sig_ignored(sig)) {
 106     // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
 107     // is ignored, since no handler for them is actually registered in JVM
 108     // or via JVM_RegisterSignal.
 109     // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
 110     return JNI_FALSE;
 111   }
 112 
 113   os::signal_raise(sig);
 114   return JNI_TRUE;
 115 JVM_END
 116