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 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