1 /*

     2  * Copyright (c) 2002, 2014, 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.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

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

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

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

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

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

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

    23  * questions.

    24  */

    25 

    26 #include <sys/types.h>

    27 #include <string.h>

    28 #include "jni.h"

    29 #include "jni_util.h"

    30 #include "jvm.h"

    31 #include "jlong.h"

    32 #include "sun_nio_ch_NativeThread.h"

    33 

    34 #include <pthread.h>

    35 #include <sys/signal.h>

    36 

    37 /* Also defined in src/aix/native/java/net/aix_close.c */

    38 #define INTERRUPT_SIGNAL (SIGRTMAX - 1)

    39 

    40 static void

    41 nullHandler(int sig)

    42 {

    43 }

    44 

    45 

    46 JNIEXPORT void JNICALL

    47 Java_sun_nio_ch_NativeThread_init(JNIEnv *env, jclass cl)

    48 {

    49     /* Install the null handler for INTERRUPT_SIGNAL. This might overwrite the

    50      * handler previously installed by java/net/aix_close.c, but that's okay

    51      * since neither handler actually does anything.  We install our own

    52      * handler here simply out of paranoia; ultimately the two mechanisms

    53      * should somehow be unified, perhaps within the VM.

    54      */

    55 

    56     sigset_t ss;

    57     struct sigaction sa, osa;

    58     sa.sa_handler = nullHandler;

    59     sa.sa_flags = 0;

    60     sigemptyset(&sa.sa_mask);

    61     if (sigaction(INTERRUPT_SIGNAL, &sa, &osa) < 0)

    62         JNU_ThrowIOExceptionWithLastError(env, "sigaction");

    63 }

    64 

    65 JNIEXPORT jlong JNICALL

    66 Java_sun_nio_ch_NativeThread_current(JNIEnv *env, jclass cl)

    67 {

    68     return (long)pthread_self();

    69 }

    70 

    71 JNIEXPORT void JNICALL

    72 Java_sun_nio_ch_NativeThread_signal(JNIEnv *env, jclass cl, jlong thread)

    73 {

    74     if (pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL))

    75         JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed");

    76 }