1 /*
2 * Copyright (c) 2002, 2016, 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 "sun_nio_ch_NativeThread.h"
33 #include "nio_util.h"
34 #include <signal.h>
35
36 #ifdef __linux__
37 #include <pthread.h>
38 /* Also defined in net/linux_close.c */
39 #define INTERRUPT_SIGNAL (__SIGRTMAX - 2)
40 #elif _AIX
41 #include <pthread.h>
42 /* Also defined in net/aix_close.c */
43 #define INTERRUPT_SIGNAL (SIGRTMAX - 1)
44 #elif __solaris__
45 #include <thread.h>
46 #define INTERRUPT_SIGNAL (SIGRTMAX - 2)
47 #elif _ALLBSD_SOURCE
48 #include <pthread.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 static void
nullHandler(int sig)56 nullHandler(int sig)
57 {
58 }
59
60 JNIEXPORT void JNICALL
Java_sun_nio_ch_NativeThread_init(JNIEnv * env,jclass cl)61 Java_sun_nio_ch_NativeThread_init(JNIEnv *env, jclass cl)
62 {
63 /* Install the null handler for INTERRUPT_SIGNAL. This might overwrite the
64 * handler previously installed by <platform>_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
79 JNIEXPORT jlong JNICALL
Java_sun_nio_ch_NativeThread_current(JNIEnv * env,jclass cl)80 Java_sun_nio_ch_NativeThread_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
89 JNIEXPORT void JNICALL
Java_sun_nio_ch_NativeThread_signal(JNIEnv * env,jclass cl,jlong thread)90 Java_sun_nio_ch_NativeThread_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 #ifdef MACOSX
99 if (ret != 0 && ret != ESRCH)
100 #else
101 if (ret != 0)
102 #endif
103 JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed");
104 }
105