1 /* 2 * Copyright (c) 2007, 2018, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <jni.h> 27 #include <jvmti.h> 28 #include <aod.h> 29 #include <jvmti_aod.h> 30 31 extern "C" { 32 33 #define LOADED_CLASS_NAME "Lnsk/jvmti/AttachOnDemand/attach014/ClassToLoad;" 34 35 /* 36 * Expected agent work scenario: 37 * - during initialization agent enables ClassLoad events 38 * - target application loads class 'ClassToLoad' 39 * - agent receives ClassLoad event for this class, calls DisposeEnvironment and finishes work 40 */ 41 42 static Options* options = NULL; 43 static const char* agentName; 44 45 void JNICALL 46 classLoadHandler(jvmtiEnv *jvmti, 47 JNIEnv* jni, 48 jthread thread, 49 jclass klass) { 50 char className[MAX_STRING_LENGTH]; 51 52 if (!nsk_jvmti_aod_getClassName(jvmti, klass, className)) { 53 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 0, jvmti, jni); 54 return; 55 } 56 57 NSK_DISPLAY2("%s: ClassLoad event was received for class '%s'\n", agentName, className); 58 59 if (!strcmp(className, LOADED_CLASS_NAME)) { 60 int success = 1; 61 62 if (!nsk_jvmti_aod_disableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD)) 63 success = 0; 64 65 if (!NSK_JVMTI_VERIFY(jvmti->DisposeEnvironment())) { 66 success = 0; 67 NSK_COMPLAIN1("%s: failed to dispose environment\n", agentName); 68 } else { 69 NSK_DISPLAY1("%s: jvmti env was disposed\n", agentName); 70 } 71 72 nsk_aod_agentFinished(jni, agentName, success); 73 } 74 } 75 76 77 #ifdef STATIC_BUILD 78 JNIEXPORT jint JNI_OnLoad_attach014Agent00(JavaVM *jvm, char *options, void *reserved) { 79 return JNI_VERSION_1_8; 80 } 81 #endif 82 83 JNIEXPORT jint JNICALL 84 #ifdef STATIC_BUILD 85 Agent_OnAttach_attach014Agent00(JavaVM *vm, char *optionsString, void *reserved) 86 #else 87 Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved) 88 #endif 89 { 90 jvmtiEventCallbacks eventCallbacks; 91 jvmtiEnv* jvmti = NULL; 92 JNIEnv* jni = NULL; 93 94 if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL)) 95 return JNI_ERR; 96 97 agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION); 98 99 if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL) 100 return NSK_FALSE; 101 102 if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL)) 103 return JNI_ERR; 104 105 memset(&eventCallbacks,0, sizeof(eventCallbacks)); 106 eventCallbacks.ClassLoad = classLoadHandler; 107 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks))) ) { 108 return JNI_ERR; 109 } 110 111 if (!(nsk_jvmti_aod_enableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD))) { 112 return JNI_ERR; 113 } 114 115 NSK_DISPLAY1("%s: initialization was done\n", agentName); 116 117 if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName))) 118 return JNI_ERR; 119 120 return JNI_OK; 121 } 122 123 }