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/*
* Copyright (c) 2004, 2005, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "jni.h"
#include "jvmti.h"
#include "agent_util.h"
/* Create major.minor.micro version string */
static void
version_check(jint cver, jint rver)
{
jint cmajor, cminor, cmicro;
jint rmajor, rminor, rmicro;
cmajor = (cver & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
cminor = (cver & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
cmicro = (cver & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
rmajor = (rver & JVMTI_VERSION_MASK_MAJOR) >> JVMTI_VERSION_SHIFT_MAJOR;
rminor = (rver & JVMTI_VERSION_MASK_MINOR) >> JVMTI_VERSION_SHIFT_MINOR;
rmicro = (rver & JVMTI_VERSION_MASK_MICRO) >> JVMTI_VERSION_SHIFT_MICRO;
stdout_message("Compile Time JVMTI Version: %d.%d.%d (0x%08x)\n",
cmajor, cminor, cmicro, cver);
stdout_message("Run Time JVMTI Version: %d.%d.%d (0x%08x)\n",
rmajor, rminor, rmicro, rver);
if ( (cmajor > rmajor) || (cmajor == rmajor && cminor > rminor) ) {
fatal_error(
"ERROR: Compile Time JVMTI and Run Time JVMTI are incompatible\n");
}
}
/* Callback for JVMTI_EVENT_VM_INIT */
static void JNICALL
vm_init(jvmtiEnv *jvmti, JNIEnv *env, jthread thread)
{
jvmtiError err;
jint runtime_version;
/* The exact JVMTI version doesn't have to match, however this
* code demonstrates how you can check that the JVMTI version seen
* in the jvmti.h include file matches that being supplied at runtime
* by the VM.
*/
err = (*jvmti)->GetVersionNumber(jvmti, &runtime_version);
check_jvmti_error(jvmti, err, "get version number");
version_check(JVMTI_VERSION, runtime_version);
}
/* Agent_OnLoad() is called first, we prepare for a VM_INIT event here. */
JNIEXPORT jint JNICALL
Agent_OnLoad(JavaVM *vm, char *options, void *reserved)
{
jint rc;
jvmtiError err;
jvmtiEventCallbacks callbacks;
jvmtiEnv *jvmti;
/* Get JVMTI environment */
rc = (*vm)->GetEnv(vm, (void **)&jvmti, JVMTI_VERSION);
if (rc != JNI_OK) {
fatal_error("ERROR: Unable to create jvmtiEnv, GetEnv failed, error=%d\n", rc);
return -1;
}
/* Set callbacks and enable event notifications */
memset(&callbacks, 0, sizeof(callbacks));
callbacks.VMInit = &vm_init;
err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, sizeof(callbacks));
check_jvmti_error(jvmti, err, "set event callbacks");
err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE,
JVMTI_EVENT_VM_INIT, NULL);
check_jvmti_error(jvmti, err, "set event notify");
return 0;
}
/* Agent_OnUnload() is called last */
JNIEXPORT void JNICALL
Agent_OnUnload(JavaVM *vm)
{
}
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