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 /*
  34  * Expected agent work scenario:
  35  *  - during initialization agent enables ThreadStart and ThreadEnd events and starts new
  36  *    thread using JVMTI RunAgentThread
  37  *  - agent receives ThreadStart event for started thread
  38     - agent receives ThreadEnd event for started thread and finishes work
  39  */
  40 
  41 #define STARTED_THREAD_NAME "ThreadStartedByAgent"
  42 
  43 static Options* options = NULL;
  44 static const char* agentName;
  45 
  46 static jvmtiEvent testEvents[] = {JVMTI_EVENT_THREAD_START, JVMTI_EVENT_THREAD_END};
  47 static const int testEventsNumber = 2;
  48 
  49 volatile int threadStartReceived = 0;
  50 volatile int threadWasExecuted = 0;
  51 
  52 void JNICALL startedThreadFunction(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {
  53     char threadName[MAX_STRING_LENGTH];
  54 
  55     if (!nsk_jvmti_aod_getThreadName(jvmti, NULL, threadName)) {
  56         nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, 0, jvmti, jni);
  57         return;
  58     }
  59 
  60     NSK_DISPLAY2("%s: thread started from agent is running (thread name: '%s')\n", agentName, threadName);
  61 
  62     threadWasExecuted = 1;
  63 }
  64 
  65 int startNewThread(jvmtiEnv* jvmti, JNIEnv* jni) {
  66     jthread thread;
  67 
  68     if (!NSK_VERIFY((thread = nsk_jvmti_aod_createThreadWithName(jni, STARTED_THREAD_NAME)) != NULL))
  69         return NSK_FALSE;
  70 
  71     if (!NSK_JVMTI_VERIFY(jvmti->RunAgentThread(thread, startedThreadFunction, NULL, JVMTI_THREAD_NORM_PRIORITY ))) {
  72         return NSK_FALSE;
  73     }
  74 
  75     NSK_DISPLAY1("%s: new thread was started\n", agentName);
  76 
  77     return NSK_TRUE;
  78 }
  79 
  80 void JNICALL threadEndHandler(jvmtiEnv *jvmti,
  81         JNIEnv* jni,
  82         jthread thread) {
  83     char threadName[MAX_STRING_LENGTH];
  84 
  85     if (!nsk_jvmti_aod_getThreadName(jvmti, thread, threadName)) {
  86         nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, 0, jvmti, jni);
  87         return;
  88     }
  89 
  90     NSK_DISPLAY2("%s: ThreadEnd event was received for thread '%s'\n", agentName, threadName);
  91 
  92     if (!strcmp(STARTED_THREAD_NAME, threadName)) {
  93         int success = 1;
  94 
  95         if (!threadStartReceived) {
  96             NSK_COMPLAIN1("%s: ThreadStart event wasn't received\n", agentName);
  97             success = 0;
  98         }
  99 
 100         if (!threadWasExecuted) {
 101             NSK_COMPLAIN1("%s: started thread haven't execute its code\n", agentName);
 102             success = 0;
 103         }
 104 
 105         nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, success, jvmti, jni);
 106     }
 107 }
 108 
 109 void JNICALL threadStartHandler(jvmtiEnv *jvmti,
 110         JNIEnv* jni,
 111         jthread thread) {
 112     char threadName[MAX_STRING_LENGTH];
 113 
 114     if (!nsk_jvmti_aod_getThreadName(jvmti, thread, threadName)) {
 115         nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, 0, jvmti, jni);
 116         return;
 117     }
 118 
 119     NSK_DISPLAY2("%s: ThreadStart event was received for thread '%s'\n", agentName, threadName);
 120 
 121     if (!strcmp(STARTED_THREAD_NAME, threadName)) {
 122         threadStartReceived = 1;
 123     }
 124 }
 125 
 126 #ifdef STATIC_BUILD
 127 JNIEXPORT jint JNI_OnLoad_attach039Agent00(JavaVM *jvm, char *options, void *reserved) {
 128     return JNI_VERSION_1_8;
 129 }
 130 #endif
 131 
 132 JNIEXPORT jint JNICALL
 133 #ifdef STATIC_BUILD
 134 Agent_OnAttach_attach039Agent00(JavaVM *vm, char *optionsString, void *reserved)
 135 #else
 136 Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)
 137 #endif
 138 {
 139     jvmtiEventCallbacks eventCallbacks;
 140     jvmtiEnv* jvmti;
 141     JNIEnv* jni;
 142 
 143     if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL))
 144         return JNI_ERR;
 145 
 146     agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);
 147 
 148     if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL)
 149         return JNI_ERR;
 150 
 151     if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL))
 152         return JNI_ERR;
 153 
 154     memset(&eventCallbacks,0, sizeof(eventCallbacks));
 155     eventCallbacks.ThreadEnd = threadEndHandler;
 156     eventCallbacks.ThreadStart = threadStartHandler;
 157     if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks))) ) {
 158         return JNI_ERR;
 159     }
 160 
 161     if (!(nsk_jvmti_aod_enableEvents(jvmti, testEvents, testEventsNumber))) {
 162         return JNI_ERR;
 163     }
 164 
 165     NSK_DISPLAY1("%s: initialization was done\n", agentName);
 166 
 167     if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName)))
 168         return JNI_ERR;
 169 
 170     NSK_DISPLAY1("%s: starting new thread\n", agentName);
 171 
 172     if (!NSK_VERIFY(startNewThread(jvmti, jni)))
 173         return JNI_ERR;
 174 
 175     return JNI_OK;
 176 }
 177 
 178 }