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 "nio_util.h"
33#include "JNIHelp.h"
34
35#define NATIVE_METHOD(className, functionName, signature) \
36{ #functionName, signature, (void*)(className ## _ ## functionName) }
37
38
39#include <pthread.h>
40#include <sys/signal.h>
41
42/* Also defined in src/solaris/native/java/net/linux_close.c */
43#define INTERRUPT_SIGNAL (__SIGRTMAX - 2)
44
45static void
46nullHandler(int sig)
47{
48}
49
50static void  NativeThread_init(JNIEnv *env)
51{
52
53    /* Install the null handler for INTERRUPT_SIGNAL.  This might overwrite the
54     * handler previously installed by java/net/linux_close.c, but that's okay
55     * since neither handler actually does anything.  We install our own
56     * handler here simply out of paranoia; ultimately the two mechanisms
57     * should somehow be unified, perhaps within the VM.
58     */
59
60    sigset_t ss;
61    struct sigaction sa, osa;
62    sa.sa_handler = nullHandler;
63    sa.sa_flags = 0;
64    sigemptyset(&sa.sa_mask);
65    if (sigaction(INTERRUPT_SIGNAL, &sa, &osa) < 0)
66        JNU_ThrowIOExceptionWithLastError(env, "sigaction");
67
68}
69
70JNIEXPORT jlong JNICALL
71NativeThread_current(JNIEnv *env, jclass cl)
72{
73    return (long)pthread_self();
74}
75
76JNIEXPORT void JNICALL
77NativeThread_signal(JNIEnv *env, jclass cl, jlong thread)
78{
79    if (pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL))
80        JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed");
81}
82
83static JNINativeMethod gMethods[] = {
84  NATIVE_METHOD(NativeThread, current, "()J"),
85  NATIVE_METHOD(NativeThread, signal, "(J)V"),
86};
87
88void register_sun_nio_ch_NativeThread(JNIEnv* env) {
89  jniRegisterNativeMethods(env, "sun/nio/ch/NativeThread", gMethods, NELEM(gMethods));
90  NativeThread_init(env);
91}
92