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
45 static void
nullHandler(int sig)46 nullHandler(int sig)
47 {
48 }
49
NativeThread_init(JNIEnv * env)50 static 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
70 JNIEXPORT jlong JNICALL
NativeThread_current(JNIEnv * env,jclass cl)71 NativeThread_current(JNIEnv *env, jclass cl)
72 {
73 return (long)pthread_self();
74 }
75
76 JNIEXPORT void JNICALL
NativeThread_signal(JNIEnv * env,jclass cl,jlong thread)77 NativeThread_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
83 static JNINativeMethod gMethods[] = {
84 NATIVE_METHOD(NativeThread, current, "()J"),
85 NATIVE_METHOD(NativeThread, signal, "(J)V"),
86 };
87
register_sun_nio_ch_NativeThread(JNIEnv * env)88 void register_sun_nio_ch_NativeThread(JNIEnv* env) {
89 jniRegisterNativeMethods(env, "sun/nio/ch/NativeThread", gMethods, NELEM(gMethods));
90 NativeThread_init(env);
91 }
92