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 events
36 * - target application starts thread
37 * - agent receives ThreadStart event for this thread and tries to call GetThreadState for
38 * all VM threads, then finishes work
39 */
40
41 #define STARTED_TEST_THREAD_NAME "attach042-TestThread"
42
43 static Options* options = NULL;
44 static const char* agentName;
45
46 void JNICALL threadStartHandler(jvmtiEnv *jvmti,
47 JNIEnv* jni,
48 jthread thread) {
49 char startedThreadName[MAX_STRING_LENGTH];
50
51 if(!nsk_jvmti_aod_getThreadName(jvmti, thread, startedThreadName)) {
52 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_THREAD_START, 0, jvmti, jni);
53 return;
54 }
55
56 NSK_DISPLAY2("%s: ThreadStart event was received for thread '%s'\n", agentName, startedThreadName);
57
58 if (!strcmp(startedThreadName, STARTED_TEST_THREAD_NAME)) {
59 int success = 1;
60 jint threadsCount = 0;
61 jthread* threads = NULL;
62 int i;
63 int startedThreadWasFound = 0;
64
65 if(!NSK_JVMTI_VERIFY(jvmti->GetAllThreads(&threadsCount, &threads))) {
66 NSK_COMPLAIN1("%s: failed to get all threads\n", agentName);
67 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_THREAD_START, 0, jvmti, jni);
68 return;
69 }
70
71 NSK_DISPLAY1("%s: displaying threads status:\n", agentName);
72
73 for (i = 0; i < threadsCount; i++) {
74 jint threadState;
75 char threadName[MAX_STRING_LENGTH];
76
77 if (!nsk_jvmti_aod_getThreadName(jvmti, threads[i], threadName)) {
78 NSK_COMPLAIN1("%s: failed to get thread name\n", agentName);
79 nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)threads);
80 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_THREAD_START, 0, jvmti, jni);
81 return;
82 }
83
84 if (!strcmp(threadName, startedThreadName)) {
85 startedThreadWasFound = 1;
86 }
87
88 if (!NSK_JVMTI_VERIFY(jvmti->GetThreadState(threads[i], &threadState))) {
89 NSK_COMPLAIN2("%s: failed to get status of thread '%s'\n", agentName, threadName);
90 nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)threads);
91 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_THREAD_START, 0, jvmti, jni);
92 return;
93 }
94
95 NSK_DISPLAY3("%s: status of '%s': %s\n", agentName, threadName, TranslateState(threadState));
96 }
97
98 nsk_jvmti_aod_deallocate(jvmti, (unsigned char*)threads);
99
100 if (!startedThreadWasFound) {
101 NSK_COMPLAIN2("%s: thread '%s' wasn't returned by GetAllThreads\n", agentName, startedThreadName);
102 success = 0;
103 }
104
105 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_THREAD_START, success, jvmti, jni);
106 }
107 }
108
109 #ifdef STATIC_BUILD
110 JNIEXPORT jint JNI_OnLoad_attach042Agent00(JavaVM *jvm, char *options, void *reserved) {
111 return JNI_VERSION_1_8;
112 }
113 #endif
114
115 JNIEXPORT jint JNICALL
116 #ifdef STATIC_BUILD
117 Agent_OnAttach_attach042Agent00(JavaVM *vm, char *optionsString, void *reserved)
118 #else
119 Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)
120 #endif
121 {
122 jvmtiEventCallbacks eventCallbacks;
123 jvmtiEnv* jvmti;
124 JNIEnv* jni;
125
126 if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL))
127 return JNI_ERR;
128
129 agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);
130
131 if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL)
132 return JNI_ERR;
133
134 if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL))
135 return JNI_ERR;
136
137 memset(&eventCallbacks,0, sizeof(eventCallbacks));
138 eventCallbacks.ThreadStart = threadStartHandler;
139 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks))) ) {
140 return JNI_ERR;
141 }
142
143 if (!(nsk_jvmti_aod_enableEvent(jvmti, JVMTI_EVENT_THREAD_START))) {
144 return JNI_ERR;
145 }
146
147 NSK_DISPLAY1("%s: initialization was done\n", agentName);
148
149 if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName)))
150 return JNI_ERR;
151
152 return JNI_OK;
153 }
154
155 }