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java/org/apache/tomcat/jni/Stdlib.java

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+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.apache.tomcat.jni;
+
+/** Stdlib
+ *
+ * @author Mladen Turk
+ */
+public class Stdlib {
+
+    /**
+     * Read from plain memory
+     * @param dst Destination byte array
+     * @param src Source memory address
+     * @param sz Number of bytes to copy.
+     * @return <code>true</code> if the operation was successful
+     */
+    public static native boolean memread(byte [] dst, long src, int sz);
+
+    /**
+     * Write to plain memory
+     * @param dst Destination memory address
+     * @param src Source byte array
+     * @param sz Number of bytes to copy.
+     * @return <code>true</code> if the operation was successful
+     */
+    public static native boolean memwrite(long dst, byte [] src, int sz);
+
+    /**
+     * Sets buffers to a specified character
+     * @param dst Destination memory address
+     * @param c Character to set.
+     * @param sz Number of characters.
+     * @return <code>true</code> if the operation was successful
+     */
+    public static native boolean memset(long dst, int c, int sz);
+
+    /**
+     * Allocates memory blocks.
+     * @param sz Bytes to allocate.
+     * @return a pointer
+     */
+    public static native long malloc(int sz);
+
+    /**
+     * Reallocate memory blocks.
+     * @param mem Pointer to previously allocated memory block.
+     * @param sz New size in bytes.
+     * @return a pointer
+     */
+    public static native long realloc(long mem, int sz);
+
+    /**
+     * Allocates an array in memory with elements initialized to 0.
+     * @param num Number of elements.
+     * @param sz Length in bytes of each element.
+     * @return a pointer
+     */
+    public static native long calloc(int num, int sz);
+
+    /**
+     * Deallocates or frees a memory block.
+     * @param mem Previously allocated memory block to be freed.
+     */
+    public static native void free(long mem);
+
+    /**
+     * Get current process pid.
+     * @return current pid or &lt; 1 in case of error.
+     */
+    public static native int getpid();
+
+    /**
+     * Get current process parent pid.
+     * @return parent pid or &lt; 1 in case of error.
+     */
+    public static native int getppid();
+
+}