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 "sun_nio_ch_NativeThread.h" 33 #include "nio_util.h" 34 35 36 #ifdef __linux__ 37 #include <pthread.h> 38 #include <sys/signal.h> 39 40 /* Also defined in src/solaris/native/java/net/linux_close.c */ 41 #define INTERRUPT_SIGNAL (__SIGRTMAX - 2) 42 43 static void 44 nullHandler(int sig) 45 { 46 } 47 48 #endif 49 50 51 JNIEXPORT void JNICALL 52 Java_sun_nio_ch_NativeThread_init(JNIEnv *env, jclass cl) 53 { 54 #ifdef __linux__ 55 56 /* Install the null handler for INTERRUPT_SIGNAL. This might overwrite the 57 * handler previously installed by java/net/linux_close.c, but that's okay 58 * since neither handler actually does anything. We install our own 59 * handler here simply out of paranoia; ultimately the two mechanisms 60 * should somehow be unified, perhaps within the VM. 61 */ 62 63 sigset_t ss; 64 struct sigaction sa, osa; 65 sa.sa_handler = nullHandler; 66 sa.sa_flags = 0; 67 sigemptyset(&sa.sa_mask); 68 if (sigaction(INTERRUPT_SIGNAL, &sa, &osa) < 0) 69 JNU_ThrowIOExceptionWithLastError(env, "sigaction"); 70 71 #endif 72 } 73 74 JNIEXPORT jlong JNICALL 75 Java_sun_nio_ch_NativeThread_current(JNIEnv *env, jclass cl) 76 { 77 #ifdef __linux__ 78 return (long)pthread_self(); 79 #else 80 return -1; 81 #endif 82 } 83 84 JNIEXPORT void JNICALL 85 Java_sun_nio_ch_NativeThread_signal(JNIEnv *env, jclass cl, jlong thread) 86 { 87 #ifdef __linux__ 88 if (pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL)) 89 JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed"); 90 #endif 91 }