Overwrite libc rename() for Java with LD_PRELOAD

console.txt

# bash on Windows
/mnt/c/ws/github/JavaSystemTest$ sudo apt install openjdk-8-jre-headless gcc ltrace strace
Paketlisten werden gelesen... Fertig
Abhängigkeitsbaum wird aufgebaut.
Statusinformationen werden eingelesen.... Fertig
»gcc« ist bereits die neuste Version (4:5.3.1-1ubuntu1).
»ltrace« ist bereits die neuste Version (0.7.3-5.1ubuntu4).
»strace« ist bereits die neuste Version (4.11-1ubuntu3).
»openjdk-8-jre-headless« ist bereits die neuste Version (8u131-b11-0ubuntu1.16.04.2).
0 aktualisiert, 0 neu installiert, 0 zu entfernen und 40 nicht aktualisiert.
/mnt/c/ws/github/JavaSystemTest$ gcc -fPIC -shared  -o libpreload.so wrap.c -ldl
/mnt/c/ws/github/JavaSystemTest$ LD_PRELOAD=./libpreload.so /usr/lib/jvm/java-8-openjdk-amd64/bin/java -cp target/classes/ net.eckenfels.test.javasystemtest.RenameFiles a b
hello world
wrapped rename(a, b)
Exception in thread "main" java.nio.file.NoSuchFileException: a -> b
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
        at sun.nio.fs.UnixCopyFile.move(UnixCopyFile.java:396)
        at sun.nio.fs.UnixFileSystemProvider.move(UnixFileSystemProvider.java:262)
        at java.nio.file.Files.move(Files.java:1395)
        at net.eckenfels.test.javasystemtest.RenameFiles.main(RenameFiles.java:25)

RenameFile.java

/*
 * RenameFiles.java
 *
 * created at 2017-07-06 by Bernd Eckenfels <[email protected]>
 *
 * License: ASL 2.0
 */
package net.eckenfels.test.javasystemtest;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

public class RenameFiles
{
    public static void main(String[] args) throws IOException
    {
        System.out.println("hello world");
        Path a = Paths.get(args[0]);
        Path b = Paths.get(args[1]);

        Files.move(a, b, StandardCopyOption.ATOMIC_MOVE);

        System.exit(0);
    }
}

wrap.c

/*
 * wrap.c
 *
 * created at 2017-07-06 by Bernd Eckenfels <[email protected]>
 *
 * License: ASL 2.0
 *
 * compile:
 *   gcc -fPIC -shared  -o libpreload.so wrap.c -ldl
 * run:
 *   LD_PRELOAD=./libpreload.so /usr/lib/jvm/java-8-openjdk-amd64/bin/java -cp ...
 * Based On:
 *   http://samanbarghi.com/blog/2014/09/05/how-to-wrap-a-system-call-libc-function-in-linux/
 */
#define _GNU_SOURCE
#include <dlfcn.h>
#include <stdio.h>
#include <string.h>

/* Function pointers to hold the value of the glibc functions */
static  int (*real_rename)(const char* from, const char* to) = NULL;

int rename(const char* from, const char* to)
{
    printf("wrapped rename(%s, %s)\n", from, to);
    if (!real_rename)
      real_rename = dlsym(RTLD_NEXT, "rename");
    return real_rename(from, to);
}