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Java > Open Source Codes > org > apache > tomcat > jni > Stdlib


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 package org.apache.tomcat.jni;
19
20 /** Stdlib
21  *
22  * @author Mladen Turk
23  * @version $Revision: 467222 $, $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
24  */
25
26 public class Stdlib {
27
28     /**
29      * Read from plain memory
30      * @param dst Destination byte array
31      * @param src Source memory address
32      * @param sz Number of bytes to copy.
33      */
34     public static native boolean memread(byte [] dst, long src, int sz);
35
36     /**
37      * Write to plain memory
38      * @param dst Destination memory address
39      * @param src Source byte array
40      * @param sz Number of bytes to copy.
41      */
42     public static native boolean memwrite(long dst, byte [] src, int sz);
43
44     /**
45      * Sets buffers to a specified character
46      * @param dst Destination memory address
47      * @param c Character to set.
48      * @param sz Number of characters.
49      */
50     public static native boolean memset(long dst, int c, int sz);
51
52     /**
53      * Allocates memory blocks.
54      * @param sz Bytes to allocate.
55      */
56     public static native long malloc(int sz);
57
58     /**
59      * Reallocate memory blocks.
60      * @param mem Pointer to previously allocated memory block.
61      * @param sz New size in bytes.
62      */
63     public static native long realloc(long mem, int sz);
64
65     /**
66      * Allocates an array in memory with elements initialized to 0.
67      * @param num Number of elements.
68      * @param sz Length in bytes of each element.
69      */
70     public static native long calloc(long num, int sz);
71
72     /**
73      * Deallocates or frees a memory block.
74      * @param mem Previously allocated memory block to be freed.
75      */
76     public static native void free(long mem);
77
78     /**
79      * Get current process pid.
80      * @return current pid or < 1 in case of error.
81      */
82     public static native int getpid();
83
84     /**
85      * Get current process parent pid.
86      * @return parent pid or < 1 in case of error.
87      */
88     public static native int getppid();
89
90 }
91
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