1 /*

     2  * Copyright (c) 2002, 2006, 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 #include "nio_util.h"

    34 

    35 #ifdef __linux__

    36   #include <pthread.h>

    37   #include <sys/signal.h>

    38   /* Also defined in net/linux_close.c */

    39   #define INTERRUPT_SIGNAL (__SIGRTMAX - 2)

    40 #elif __solaris__

    41   #include <thread.h>

    42   #include <signal.h>

    43   #define INTERRUPT_SIGNAL (SIGRTMAX - 2)

    44 #elif _ALLBSD_SOURCE

    45   #include <pthread.h>

    46   #include <signal.h>

    47   /* Also defined in net/bsd_close.c */

    48   #define INTERRUPT_SIGNAL SIGIO

    49 #else

    50   #error "missing platform-specific definition here"

    51 #endif

    52 

    53 static void

    54 nullHandler(int sig)

    55 {

    56 }

    57 

    58 JNIEXPORT void JNICALL

    59 Java_sun_nio_ch_NativeThread_init(JNIEnv *env, jclass cl)

    60 {

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

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

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

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

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

    66      */

    67 

    68     sigset_t ss;

    69     struct sigaction sa, osa;

    70     sa.sa_handler = nullHandler;

    71     sa.sa_flags = 0;

    72     sigemptyset(&sa.sa_mask);

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

    74         JNU_ThrowIOExceptionWithLastError(env, "sigaction");

    75 }

    76 

    77 JNIEXPORT jlong JNICALL

    78 Java_sun_nio_ch_NativeThread_current(JNIEnv *env, jclass cl)

    79 {

    80 #ifdef __solaris__

    81     return (jlong)thr_self();

    82 #else

    83     return (jlong)pthread_self();

    84 #endif

    85 }

    86 

    87 JNIEXPORT void JNICALL

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

    89 {

    90     int ret;

    91 #ifdef __solaris__

    92     ret = thr_kill((thread_t)thread, INTERRUPT_SIGNAL);

    93 #else

    94     ret = pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL);

    95 #endif

    96     if (ret != 0)

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

    98 }