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60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
/*
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* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <jvmti.h>
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#include <cstdio>
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#include <cstring>
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extern "C" {
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static void JNICALL VMStartCallback(jvmtiEnv* jvmti, JNIEnv* env) {
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putchar('1');
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fflush(stdout);
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getchar();
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}
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JNIEXPORT int Agent_OnLoad(JavaVM* vm, char* options, void* reserved) {
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jvmtiEnv* jvmti;
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if (vm->GetEnv((void**) &jvmti, JVMTI_VERSION_1_0) != JVMTI_ERROR_NONE) {
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fprintf(stderr, "JVMTI error occurred during GetEnv\n");
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return JNI_ERR;
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}
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jvmtiEventCallbacks callbacks;
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.VMStart = VMStartCallback;
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if (jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks)) != JVMTI_ERROR_NONE) {
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fprintf(stderr, "JVMTI error occurred during SetEventCallbacks\n");
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return JNI_ERR;
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}
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if (jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_VM_START, nullptr) != JVMTI_ERROR_NONE) {
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fprintf(stderr, "JVMTI error occurred during SetEventNotificationMode\n");
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return JNI_ERR;
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}
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return JNI_OK;
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}
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}
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