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 }