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 defined(_AIX)
41 #include <pthread.h>
42 /* Also defined in net/aix_close.c */
43 #define INTERRUPT_SIGNAL (SIGRTMAX - 1)
44#elif defined(__solaris__)
45 #include <thread.h>
46 #define INTERRUPT_SIGNAL (SIGRTMAX - 2)
47#elif defined(_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
55static void
56nullHandler(int sig)
57{
58}
59
60JNIEXPORT void JNICALL
61Java_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
79JNIEXPORT jlong JNICALL
80Java_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
89JNIEXPORT void JNICALL
90Java_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