1 /* Copyright (c) 2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 import java.io.FileOutputStream;
10 import java.io.InputStream;
11 import java.io.OutputStream;
14 public final class NativeLib {
16 public static String getPath() {
17 String prefix = "NATIVE";
18 String os = System.getProperty("os.name");
19 String arch = System.getProperty("os.arch");
21 if (os.toLowerCase().startsWith("^win"))
23 else if (os.contains("OS X"))
26 if (arch.matches("^i[3-6]86$"))
28 else if (arch.equalsIgnoreCase("amd64"))
31 os = os.replace(' ', '_');
32 arch = arch.replace(' ', '_');
34 return prefix + "/" + os + "/" + arch + "/";
36 public static void nativeInit(String name) {
38 /* prefer the version on disk, if existing */
39 System.loadLibrary(name);
40 } catch (UnsatisfiedLinkError e) {
41 /* If not found, unpack the one bundled into the jar file and use it */
46 private static void loadLib (String name) {
47 String Path = NativeLib.getPath();
50 InputStream in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
53 filename = "lib"+name+".so";
54 in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
57 filename = name+".dll";
58 in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
61 filename = "lib"+name+".dll";
62 in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
65 filename = "lib"+name+".dylib";
66 in = NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
69 throw new RuntimeException("Cannot find library "+name+" in path "+Path+". Sorry, but this jar does not seem to be usable on your machine.");
72 // We must write the lib onto the disk before loading it -- stupid operating systems
73 File fileOut = new File(filename);
74 fileOut = File.createTempFile(name+"-", ".tmp");
75 // don't leak the file on disk, but remove it on JVM shutdown
76 Runtime.getRuntime().addShutdownHook(new Thread(new FileCleaner(fileOut.getAbsolutePath())));
77 OutputStream out = new FileOutputStream(fileOut);
79 /* copy the library in position */
80 byte[] buffer = new byte[4096];
82 while ((bytes_read = in.read(buffer)) != -1) // Read until EOF
83 out.write(buffer, 0, bytes_read);
85 /* close all file descriptors, and load that shit */
88 System.load(fileOut.getAbsolutePath());
90 } catch (Exception e) {
91 System.err.println("Cannot load the bindings to the "+name+" library: ");
93 System.err.println("This jar file does not seem to fit your system, sorry");
98 /* A hackish mechanism used to remove the file containing our library when the JVM shuts down */
99 private static class FileCleaner implements Runnable {
100 private String target;
101 public FileCleaner(String name) {
106 new File(target).delete();
107 } catch(Exception e) {
108 System.out.println("Unable to clean temporary file "+target+" during shutdown.");
115 public static void main(String[] args) {
116 System.out.println(getPath());