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
58 static void
nullHandler(int sig)59 nullHandler(int sig)
60 {
61 }
62
NativeThread_init(JNIEnv * env)63 static 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
81 JNIEXPORT jlong JNICALL
NativeThread_current(JNIEnv * env,jclass cl)82 NativeThread_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
91 JNIEXPORT void JNICALL
NativeThread_signal(JNIEnv * env,jclass cl,jlong thread)92 NativeThread_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
104 static JNINativeMethod gMethods[] = {
105 NATIVE_METHOD(NativeThread, current, "()J"),
106 NATIVE_METHOD(NativeThread, signal, "(J)V"),
107 };
108
register_sun_nio_ch_NativeThread(JNIEnv * env)109 void register_sun_nio_ch_NativeThread(JNIEnv* env) {
110 jniRegisterNativeMethods(env, "sun/nio/ch/NativeThread", gMethods, NELEM(gMethods));
111 NativeThread_init(env);
112 }
113