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 <nativehelper/JNIHelp.h>
34
35#ifdef __linux__
36  #include <pthread.h>
37  #include <sys/signal.h>
38  // Android-changed: Bionic (and AsynchronousCloseMonitor) expects libcore to use
39  // __SIGRTMIN + 2, not __SIGRTMAX - 2
40  /* Also defined in net/linux_close.c */
41  #define INTERRUPT_SIGNAL (__SIGRTMIN + 2)
42#elif __solaris__
43  #include <thread.h>
44  #include <signal.h>
45  #define INTERRUPT_SIGNAL (SIGRTMAX - 2)
46#elif _ALLBSD_SOURCE
47  #include <pthread.h>
48  #include <signal.h>
49  /* Also defined in net/bsd_close.c */
50  #define INTERRUPT_SIGNAL SIGIO
51#else
52  #error "missing platform-specific definition here"
53#endif
54
55#define NATIVE_METHOD(className, functionName, signature) \
56{ #functionName, signature, (void*)(className ## _ ## functionName) }
57
58static void
59nullHandler(int sig)
60{
61}
62
63static void  NativeThread_init(JNIEnv *env)
64{
65    /* Install the null handler for INTERRUPT_SIGNAL.  This might overwrite the
66     * handler previously installed by java/net/linux_close.c, but that's okay
67     * since neither handler actually does anything.  We install our own
68     * handler here simply out of paranoia; ultimately the two mechanisms
69     * should somehow be unified, perhaps within the VM.
70     */
71
72    sigset_t ss;
73    struct sigaction sa, osa;
74    sa.sa_handler = nullHandler;
75    sa.sa_flags = 0;
76    sigemptyset(&sa.sa_mask);
77    if (sigaction(INTERRUPT_SIGNAL, &sa, &osa) < 0)
78        JNU_ThrowIOExceptionWithLastError(env, "sigaction");
79}
80
81JNIEXPORT jlong JNICALL
82NativeThread_current(JNIEnv *env, jclass cl)
83{
84#ifdef __solaris__
85    return (jlong)thr_self();
86#else
87    return (jlong)pthread_self();
88#endif
89}
90
91JNIEXPORT void JNICALL
92NativeThread_signal(JNIEnv *env, jclass cl, jlong thread)
93{
94    int ret;
95#ifdef __solaris__
96    ret = thr_kill((thread_t)thread, INTERRUPT_SIGNAL);
97#else
98    ret = pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL);
99#endif
100    if (ret != 0)
101        JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed");
102}
103
104static JNINativeMethod gMethods[] = {
105  NATIVE_METHOD(NativeThread, current, "()J"),
106  NATIVE_METHOD(NativeThread, signal, "(J)V"),
107};
108
109void register_sun_nio_ch_NativeThread(JNIEnv* env) {
110  jniRegisterNativeMethods(env, "sun/nio/ch/NativeThread", gMethods, NELEM(gMethods));
111  NativeThread_init(env);
112}
113