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#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#define NATIVE_METHOD(className, functionName, signature) \
54{ #functionName, signature, (void*)(className ## _ ## functionName) }
55
56static void
57nullHandler(int sig)
58{
59}
60
61static void  NativeThread_init(JNIEnv *env)
62{
63    /* Install the null handler for INTERRUPT_SIGNAL.  This might overwrite the
64     * handler previously installed by java/net/linux_close.c, but that's okay
65     * since neither handler actually does anything.  We install our own
66     * handler here simply out of paranoia; ultimately the two mechanisms
67     * should somehow be unified, perhaps within the VM.
68     */
69
70    sigset_t ss;
71    struct sigaction sa, osa;
72    sa.sa_handler = nullHandler;
73    sa.sa_flags = 0;
74    sigemptyset(&sa.sa_mask);
75    if (sigaction(INTERRUPT_SIGNAL, &sa, &osa) < 0)
76        JNU_ThrowIOExceptionWithLastError(env, "sigaction");
77}
78
79JNIEXPORT jlong JNICALL
80NativeThread_current(JNIEnv *env, jclass cl)
81{
82#ifdef __solaris__
83    return (jlong)thr_self();
84#else
85    return (jlong)pthread_self();
86#endif
87}
88
89JNIEXPORT void JNICALL
90NativeThread_signal(JNIEnv *env, jclass cl, jlong thread)
91{
92    int ret;
93#ifdef __solaris__
94    ret = thr_kill((thread_t)thread, INTERRUPT_SIGNAL);
95#else
96    ret = pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL);
97#endif
98    if (ret != 0)
99        JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed");
100}
101
102static JNINativeMethod gMethods[] = {
103  NATIVE_METHOD(NativeThread, current, "()J"),
104  NATIVE_METHOD(NativeThread, signal, "(J)V"),
105};
106
107void register_sun_nio_ch_NativeThread(JNIEnv* env) {
108  jniRegisterNativeMethods(env, "sun/nio/ch/NativeThread", gMethods, NELEM(gMethods));
109  NativeThread_init(env);
110}
111