1 /*
   2  * Copyright (c) 2015, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include <stdio.h>
  27 #include <jni.h>
  28 #include "jni_util.h"
  29 #include "jvm.h"
  30 #include "management_ext.h"
  31 
  32 #define ERR_MSG_SIZE 128
  33 
  34 const JmmInterface* jmm_interface = NULL;
  35 JavaVM* jvm = NULL;
  36 jint jmm_version = 0;
  37 
  38 JNIEXPORT jint JNICALL
  39    DEF_JNI_OnLoad(JavaVM *vm, void *reserved) {
  40     JNIEnv* env;
  41 
  42     jvm = vm;
  43     if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_2) != JNI_OK) {
  44         return JNI_ERR;
  45     }
  46 
  47     jmm_interface = (JmmInterface*) JVM_GetManagement(JMM_VERSION_1_0);
  48     if (jmm_interface == NULL) {
  49         JNU_ThrowInternalError(env, "Unsupported Management version");
  50         return JNI_ERR;
  51     }
  52 
  53     jmm_version = jmm_interface->GetVersion(env);
  54     return (*env)->GetVersion(env);
  55 }
  56 
  57 void throw_internal_error(JNIEnv* env, const char* msg) {
  58     char errmsg[128];
  59 
  60     sprintf(errmsg, "errno: %d error: %s\n", errno, msg);
  61     JNU_ThrowInternalError(env, errmsg);
  62 }