jdk8-mips64-public/hotspot: src/os/aix/vm/jvm

     1 /*

     2  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * Copyright 2012, 2013 SAP AG. All rights reserved.

     4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     5  *

     6  * This code is free software; you can redistribute it and/or modify it

     7  * under the terms of the GNU General Public License version 2 only, as

     8  * published by the Free Software Foundation.

     9  *

    10  * This code is distributed in the hope that it will be useful, but WITHOUT

    11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13  * version 2 for more details (a copy is included in the LICENSE file that

    14  * accompanied this code).

    15  *

    16  * You should have received a copy of the GNU General Public License version

    17  * 2 along with this work; if not, write to the Free Software Foundation,

    18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19  *

    20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    21  * or visit www.oracle.com if you need additional information or have any

    22  * questions.

    23  *

    24  */

    26 #include "precompiled.hpp"

    27 #include "prims/jvm.h"

    28 #include "runtime/interfaceSupport.hpp"

    29 #include "runtime/osThread.hpp"

    31 #include <signal.h>

    34 // sun.misc.Signal ///////////////////////////////////////////////////////////

    35 // Signal code is mostly copied from classic vm, signals_md.c   1.4 98/08/23

    36 /*

    37  * This function is included primarily as a debugging aid. If Java is

    38  * running in a console window, then pressing <CTRL-\\> will cause

    39  * the current state of all active threads and monitors to be written

    40  * to the console window.

    41  */

    43 JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))

    44   // Copied from classic vm

    45   // signals_md.c       1.4 98/08/23

    46   void* newHandler = handler == (void *)2

    47                    ? os::user_handler()

    48                    : handler;

    49   switch (sig) {

    50     /* The following are already used by the VM. */

    51     case INTERRUPT_SIGNAL:

    52     case SIGFPE:

    53     case SIGILL:

    54     case SIGSEGV:

    56     /* The following signal is used by the VM to dump thread stacks unless

    57        ReduceSignalUsage is set, in which case the user is allowed to set

    58        his own _native_ handler for this signal; thus, in either case,

    59        we do not allow JVM_RegisterSignal to change the handler. */

    60     case BREAK_SIGNAL:

    61       return (void *)-1;

    63     /* The following signals are used for Shutdown Hooks support. However, if

    64        ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via

    65        System.exit(), Java is not allowed to use these signals, and the the

    66        user is allowed to set his own _native_ handler for these signals and

    67        invoke System.exit() as needed. Terminator.setup() is avoiding

    68        registration of these signals when -Xrs is present.

    69        - If the HUP signal is ignored (from the nohup) command, then Java

    70          is not allowed to use this signal.

    71      */

    73     case SHUTDOWN1_SIGNAL:

    74     case SHUTDOWN2_SIGNAL:

    75     case SHUTDOWN3_SIGNAL:

    76       if (ReduceSignalUsage) return (void*)-1;

    77       if (os::Aix::is_sig_ignored(sig)) return (void*)1;

    78   }

    80   void* oldHandler = os::signal(sig, newHandler);

    81   if (oldHandler == os::user_handler()) {

    82       return (void *)2;

    83   } else {

    84       return oldHandler;

    85   }

    86 JVM_END

    89 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))

    90   if (ReduceSignalUsage) {

    91     // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,

    92     // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since

    93     // no handler for them is actually registered in JVM or via

    94     // JVM_RegisterSignal.

    95     if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||

    96         sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {

    97       return JNI_FALSE;

    98     }

    99   }

   100   else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||

   101             sig == SHUTDOWN3_SIGNAL) && os::Aix::is_sig_ignored(sig)) {

   102     // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL

   103     // is ignored, since no handler for them is actually registered in JVM

   104     // or via JVM_RegisterSignal.

   105     // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL

   106     return JNI_FALSE;

   107   }

   109   os::signal_raise(sig);

   110   return JNI_TRUE;

   111 JVM_END

   113 /*

   114   All the defined signal names for Linux.

   116   NOTE that not all of these names are accepted by our Java implementation

   118   Via an existing claim by the VM, sigaction restrictions, or

   119   the "rules of Unix" some of these names will be rejected at runtime.

   120   For example the VM sets up to handle USR1, sigaction returns EINVAL for

   121   STOP, and Linux simply doesn't allow catching of KILL.

   123   Here are the names currently accepted by a user of sun.misc.Signal with

   124   1.4.1 (ignoring potential interaction with use of chaining, etc):

   126     HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,

   127     CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,

   128     WINCH, POLL, IO, PWR, SYS

   130 */

   132 struct siglabel {

   133   const char *name;

   134   int   number;

   135 };

   137 struct siglabel siglabels[] = {

   138   /* derived from /usr/include/bits/signum.h on RH7.2 */

   139    "HUP",       SIGHUP,         /* Hangup (POSIX).  */

   140   "INT",        SIGINT,         /* Interrupt (ANSI).  */

   141   "QUIT",       SIGQUIT,        /* Quit (POSIX).  */

   142   "ILL",        SIGILL,         /* Illegal instruction (ANSI).  */

   143   "TRAP",       SIGTRAP,        /* Trace trap (POSIX).  */

   144   "ABRT",       SIGABRT,        /* Abort (ANSI).  */

   145   "IOT",        SIGIOT,         /* IOT trap (4.2 BSD).  */

   146   "BUS",        SIGBUS,         /* BUS error (4.2 BSD).  */

   147   "FPE",        SIGFPE,         /* Floating-point exception (ANSI).  */

   148   "KILL",       SIGKILL,        /* Kill, unblockable (POSIX).  */

   149   "USR1",       SIGUSR1,        /* User-defined signal 1 (POSIX).  */

   150   "SEGV",       SIGSEGV,        /* Segmentation violation (ANSI).  */

   151   "USR2",       SIGUSR2,        /* User-defined signal 2 (POSIX).  */

   152   "PIPE",       SIGPIPE,        /* Broken pipe (POSIX).  */

   153   "ALRM",       SIGALRM,        /* Alarm clock (POSIX).  */

   154   "TERM",       SIGTERM,        /* Termination (ANSI).  */

   155 #ifdef SIGSTKFLT

   156   "STKFLT",     SIGSTKFLT,      /* Stack fault.  */

   157 #endif

   158   "CLD",        SIGCLD,         /* Same as SIGCHLD (System V).  */

   159   "CHLD",       SIGCHLD,        /* Child status has changed (POSIX).  */

   160   "CONT",       SIGCONT,        /* Continue (POSIX).  */

   161   "STOP",       SIGSTOP,        /* Stop, unblockable (POSIX).  */

   162   "TSTP",       SIGTSTP,        /* Keyboard stop (POSIX).  */

   163   "TTIN",       SIGTTIN,        /* Background read from tty (POSIX).  */

   164   "TTOU",       SIGTTOU,        /* Background write to tty (POSIX).  */

   165   "URG",        SIGURG,         /* Urgent condition on socket (4.2 BSD).  */

   166   "XCPU",       SIGXCPU,        /* CPU limit exceeded (4.2 BSD).  */

   167   "XFSZ",       SIGXFSZ,        /* File size limit exceeded (4.2 BSD).  */

   168   "DANGER",     SIGDANGER,      /* System crash imminent; free up some page space (AIX). */

   169   "VTALRM",     SIGVTALRM,      /* Virtual alarm clock (4.2 BSD).  */

   170   "PROF",       SIGPROF,        /* Profiling alarm clock (4.2 BSD).  */

   171   "WINCH",      SIGWINCH,       /* Window size change (4.3 BSD, Sun).  */

   172   "POLL",       SIGPOLL,        /* Pollable event occurred (System V).  */

   173   "IO",         SIGIO,          /* I/O now possible (4.2 BSD).  */

   174   "PWR",        SIGPWR,         /* Power failure restart (System V).  */

   175 #ifdef SIGSYS

   176   "SYS",        SIGSYS          /* Bad system call. Only on some Linuxen! */

   177 #endif

   178   };

   180 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))

   182   /* find and return the named signal's number */

   184   for(uint i=0; i<ARRAY_SIZE(siglabels); i++)

   185     if(!strcmp(name, siglabels[i].name))

   186       return siglabels[i].number;

   188   return -1;

   190 JVM_END

   192 // used by os::exception_name()

   193 extern bool signal_name(int signo, char* buf, size_t len) {

   194   for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {

   195     if (signo == siglabels[i].number) {

   196       jio_snprintf(buf, len, "SIG%s", siglabels[i].name);

   197       return true;

   198     }

   199   }

   200   return false;

   201 }

src/os/aix/vm/jvm_aix.cpp@666e6ce3976c

src/os/aix/vm/jvm_aix.cpp

Mercurial > jdk8-mips64-public > hotspot / file revision

src/os/aix/vm/jvm_aix.cpp@666e6ce3976c

src/os/aix/vm/jvm_aix.cpp