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 // Android-changed: Use correct include for signal.h
38 // #include <sys/signal.h>
39 #include <signal.h>
40 // Android-changed: Bionic (and AsynchronousCloseMonitor) expects libcore to use
41 // __SIGRTMIN + 2, not __SIGRTMAX - 2
42 // Also use SIGRTMAX instead of __SIGRTMAX, which is not defined by musl.
43 /* Also defined in net/linux_close.c */
44 #if !defined(__BIONIC__)
45 #define INTERRUPT_SIGNAL (SIGRTMAX - 2)
46 #else
47 #define INTERRUPT_SIGNAL (__SIGRTMIN + 2)
48 #endif
49 #elif __solaris__
50 #include <thread.h>
51 #include <signal.h>
52 #define INTERRUPT_SIGNAL (SIGRTMAX - 2)
53 #elif _ALLBSD_SOURCE
54 #include <pthread.h>
55 #include <signal.h>
56 /* Also defined in net/bsd_close.c */
57 #define INTERRUPT_SIGNAL SIGIO
58 // BEGIN Android-added: Fuchsia: Support for Fuchsia platform.
59 #elif __Fuchsia__
60 #include <pthread.h>
61 #include <signal.h>
62 /* Also defined in net/bsd_close.c */
63 #define INTERRUPT_SIGNAL SIGIO
64 // END Android-added: Fuchsia: Support for Fuchsia platform.
65 #else
66 #error "missing platform-specific definition here"
67 #endif
68
69 #define NATIVE_METHOD(className, functionName, signature) \
70 { #functionName, signature, (void*)(className ## _ ## functionName) }
71
72 static void
nullHandler(int sig)73 nullHandler(int sig)
74 {
75 }
76
NativeThread_init(JNIEnv * env)77 static void NativeThread_init(JNIEnv *env)
78 {
79 /* Install the null handler for INTERRUPT_SIGNAL. This might overwrite the
80 * handler previously installed by java/net/linux_close.c, but that's okay
81 * since neither handler actually does anything. We install our own
82 * handler here simply out of paranoia; ultimately the two mechanisms
83 * should somehow be unified, perhaps within the VM.
84 */
85
86 sigset_t ss;
87 struct sigaction sa, osa;
88 sa.sa_handler = nullHandler;
89 sa.sa_flags = 0;
90 sigemptyset(&sa.sa_mask);
91 if (sigaction(INTERRUPT_SIGNAL, &sa, &osa) < 0)
92 JNU_ThrowIOExceptionWithLastError(env, "sigaction");
93 }
94
95 JNIEXPORT jlong JNICALL
NativeThread_current(JNIEnv * env,jclass cl)96 NativeThread_current(JNIEnv *env, jclass cl)
97 {
98 #ifdef __solaris__
99 return (jlong)thr_self();
100 #else
101 return (jlong)pthread_self();
102 #endif
103 }
104
105 JNIEXPORT void JNICALL
NativeThread_signal(JNIEnv * env,jclass cl,jlong thread)106 NativeThread_signal(JNIEnv *env, jclass cl, jlong thread)
107 {
108 int ret;
109 #ifdef __solaris__
110 ret = thr_kill((thread_t)thread, INTERRUPT_SIGNAL);
111 #else
112 ret = pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL);
113 #endif
114 if (ret != 0)
115 JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed");
116 }
117
118 static JNINativeMethod gMethods[] = {
119 NATIVE_METHOD(NativeThread, current, "()J"),
120 NATIVE_METHOD(NativeThread, signal, "(J)V"),
121 };
122
register_sun_nio_ch_NativeThread(JNIEnv * env)123 void register_sun_nio_ch_NativeThread(JNIEnv* env) {
124 jniRegisterNativeMethods(env, "sun/nio/ch/NativeThread", gMethods, NELEM(gMethods));
125 NativeThread_init(env);
126 }
127