1 /* 2 * Copyright (c) 2002, 2020, 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(_ALLBSD_SOURCE) 45 #include <pthread.h> 46 /* Also defined in net/bsd_close.c */ 47 #define INTERRUPT_SIGNAL SIGIO 48 #else 49 #error "missing platform-specific definition here" 50 #endif 51 52 static void 53 nullHandler(int sig) 54 { 55 } 56 57 JNIEXPORT void JNICALL 58 Java_sun_nio_ch_NativeThread_init(JNIEnv *env, jclass cl) 59 { 60 /* Install the null handler for INTERRUPT_SIGNAL. This might overwrite the 61 * handler previously installed by <platform>_close.c, but that's okay 62 * since neither handler actually does anything. We install our own 63 * handler here simply out of paranoia; ultimately the two mechanisms 64 * should somehow be unified, perhaps within the VM. 65 */ 66 67 sigset_t ss; 68 struct sigaction sa, osa; 69 sa.sa_handler = nullHandler; 70 sa.sa_flags = 0; 71 sigemptyset(&sa.sa_mask); 72 if (sigaction(INTERRUPT_SIGNAL, &sa, &osa) < 0) 73 JNU_ThrowIOExceptionWithLastError(env, "sigaction"); 74 } 75 76 JNIEXPORT jlong JNICALL 77 Java_sun_nio_ch_NativeThread_current(JNIEnv *env, jclass cl) 78 { 79 return (jlong)pthread_self(); 80 } 81 82 JNIEXPORT void JNICALL 83 Java_sun_nio_ch_NativeThread_signal(JNIEnv *env, jclass cl, jlong thread) 84 { 85 int ret; 86 ret = pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL); 87 #ifdef MACOSX 88 if (ret != 0 && ret != ESRCH) 89 #else 90 if (ret != 0) 91 #endif 92 JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed"); 93 }