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

7013964: openjdk LICENSE file needs rebranding
Reviewed-by: darcy, katleman, jjg

     1 /*

     2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "prims/jvm.h"

    27 #include "runtime/interfaceSupport.hpp"

    28 #include "runtime/osThread.hpp"

    30 #include <signal.h>

    32 /*

    33  * FIXME: This is temporary hack to keep Linux Runtime.exec()

    34  * code happy. See $JDK/src/linux/native/java/lang/UnixProcess_md.c

    35  */

    36 int _JVM_native_threads = 1;

    38 // sun.misc.Signal ///////////////////////////////////////////////////////////

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

    40 /*

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

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

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

    44  * to the console window.

    45  */

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

    48   // Copied from classic vm

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

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

    51                    ? os::user_handler()

    52                    : handler;

    53   switch (sig) {

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

    55     case INTERRUPT_SIGNAL:

    56     case SIGFPE:

    57     case SIGILL:

    58     case SIGSEGV:

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

    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;

    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      */

    77     case SHUTDOWN1_SIGNAL:

    78     case SHUTDOWN2_SIGNAL:

    79     case SHUTDOWN3_SIGNAL:

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

    81       if (os::Linux::is_sig_ignored(sig)) return (void*)1;

    82   }

    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

    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::Linux::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   }

   113   os::signal_raise(sig);

   114   return JNI_TRUE;

   115 JVM_END

   117 /*

   118   All the defined signal names for Linux.

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

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

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

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

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

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

   128   1.4.1 (ignoring potential interaction with use of chaining, etc):

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

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

   132     WINCH, POLL, IO, PWR, SYS

   134 */

   136 struct siglabel {

   137   const char *name;

   138   int   number;

   139 };

   141 struct siglabel siglabels[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   159 #ifdef SIGSTKFLT

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

   161 #endif

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   178 #ifdef SIGSYS

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

   180 #endif

   181   };

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

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

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

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

   189       return siglabels[i].number;

   191   return -1;

   193 JVM_END

   195 // used by os::exception_name()

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

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

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

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

   200       return true;

   201     }

   202   }

   203   return false;

   204 }

src/os/linux/vm/jvm_linux.cpp@cdef89d821bd

src/os/linux/vm/jvm_linux.cpp

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

src/os/linux/vm/jvm_linux.cpp@cdef89d821bd

src/os/linux/vm/jvm_linux.cpp